Free and fast online tools to help you plan your inspection and compliance processes. Your information is calculated solely in your browser — no registration or email required.

📅Periodic Inspection PeriodWhich equipment should be inspected and how often? 🔎Report/Document VerificationConfirm authenticity with the report number or QR code.

↓ 52 calculation tools — click the title to open. Each tool also has a detailed guide page.

Compensation & Power Quality
⚡Reactive Power & Compensation Penalty RiskInductive/capacitive ratio and penalty threshold

Reactive Power & Compensation Penalty Risk

Enter the energy values from your monthly bill; see your inductive/capacitive reactive ratios, approximate power factor (cosφ), and your status according to penalty thresholds.

Inductive ratio
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Capacitive ratio
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Approx. power factor
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General thresholds: In common practice, it's monthly. endüktif reaktif enerji ≤ aktif enerjinin %20'si, kapasitif ≤ %15'i should be (approximately cosφ ≥ 0.98). Binding thresholds and penalty conditions may vary depending on EPDK regulations and your distribution company; exemptions may apply depending on your consumer class. This information is for preliminary purposes only; the final assessment will be based on your invoice.
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🔌Compensation Capacitor PowerkVAr required for the target cosφ

Compensation — Required Capacitor Power

Calculate the reactive power (kVAr) required to achieve the target power factor (cosφ). This complements the reactive penalty risk tool: a tool that identifies the problem, and a tool that sizes the solution.

Required capacitor
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tanφ₁ → tanφ₂
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Notes: Qc = P·(tanφ₁−tanφ₂). The result is indicative; in the actual panel design... Stepping, harmonic load (detuned/reactor compensation), and resonance. Engineering assessment is required. Values are calculated based on your inputs.
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Power & Energy
🔺Power Triangle Converter (P/Q/S/cosφ)Active power S, Q and phase angle

Power Triangle Converter (P / Q / S / cosφ)

Enter the active power (P) and power factor (cosφ); instantly view the apparent power (S), reactive power (Q), and phase angle (φ).

Apparent power S
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Reactive power Q
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Phase angle φ
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tanφ
–
Notes: S = P/cosφ, Q = P·tanφ, S² = P² + Q². The values are calculated according to the P and cosφ you enter. For inductive loads, Q is taken as lagging (positive), and for capacitive loads, it is taken as leading (negative).
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⚡Three-Phase Power Calculator (kW/kVA)From U, I, cosφ, we have P, S, and Q.

Three-Phase Power Calculator (kW/kVA)

Calculate active (kW), apparent (kVA), and reactive (kVAr) power from voltage, current, and power factor.

Active power P
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Apparent power S
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Reactive power Q
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Notes: 3F: P=√3·U·I·cosφ, S=√3·U·I · 1F: P=U·I·cosφ, S=U·I · Q=√(S²−P²). Values are calculated according to your inputs; U is the line (phase-to-phase) voltage.
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🔥Cable/Line Power Loss (I²R)Conductor loss and annual energy

Cable/Line Power Loss (I²R)

Calculate the conductor power loss (I²R) in a transmission/distribution line; you can also see the annual energy loss and cost if desired.

Conductor resistance R
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Power loss
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Annual energy loss
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Notes: R = ρ·L/A · 3F loss = 3·I²·R, 1F loss = 2·I²·R (round trip). ρ: copper 0.0178, aluminum 0.0284 Ω·mm²/m (20 °C). It is an omics approach; The increase in resistance with temperature and harmonic effects are neglected. The loss is reduced by increasing the cross-sectional area or by correcting the power factor.
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💵Energy Consumption & CostMonthly/annual kWh and TL

Energy Consumption & Cost

Calculate the monthly and annual energy consumption and electricity cost of a load (motor, lighting, appliance).

Monthly energy
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Monthly cost
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Annual cost
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Notes: Monthly energy = P × daily hours × days per month · Cost = energy × tariff. The result is only the active energy consumption; Distribution/transmission fees, taxes, power charges, and reactive power penalties are not included. The actual bill will vary depending on your tariff plan.
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📈Power Factor Correction GainCurrent and I²R loss reduction

Power Factor Correction Gain (Current & Loss)

See how much the line current and I²R losses decrease when you improve the power factor (cosφ). Quantify the benefit of compensation.

Current reduction
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I²R loss reduction
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New trend I₂
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Notes: At the same active power, I₂/I₁ = cosφ₁/cosφ₂; since line loss is proportional to the square of the current, the loss ratio is (cosφ₁/cosφ₂)². Values are calculated according to your inputs; the same level of relief is provided in cable and transformer capacity.
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Plumbing & Cables
📉Voltage Drop & Cable Cross-SectionLine %ΔU, %3–5 boundary control.

Voltage Drop & Cable Cross-Section

Calculate the approximate percentage voltage drop of a line and compare it to the %3–5 reference limits.

Voltage drop
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Percentage
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Notes: 3F: ΔU=√3·ρ·L·I·cosφ/A · 1F: ΔU=2·ρ·L·I·cosφ/A. This is an ohmic approach; cable reactance and temperature correction are neglected. Reference limit: lighting ≤ %3, other uses ≤ %5 (TS EN 60364 / relevant regulation). The full method is applied for precise calculation.
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🧵Cable Load & Correction (Ampacity)Temperature/grouping corrected capacitor

Cable Load & Correction Factor (Ampacity)

Adjust your cable's catalog current carrying capacity according to ambient temperature and grouping; check if it meets the design current.

Corrected capacity trace
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Correction factor
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Notes: Iz = Iz₀ × k_temperature × k_grouping (IEC/HD 60364-5-52). Catalog value Iz₀ from the cable manufacturer's table / relevant standard Correction factors are selected (depending on the laying method, number of conductors, and insulation). The correction factors are a reference for PVC 70°C; they are different for XLPE. The exact selection requires engineering verification.
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🔧Fuse/Circuit Breaker Selection (Ib≤In≤Iz)Suitable standard rated current

Fuse/Circuit Breaker Selection (Ib ≤ In ≤ Iz)

Determine the appropriate standard rated current (In) based on the design current and cable capacity (overcurrent protection coordination).

The recommended rated current is In
–
Rule
Ib ≤ In ≤ Iz
Notes: IEC/HD 60364-4-43 coordination rule: Ib ≤ In ≤ Iz and I₂ ≤ 1.45·Iz. Since I₂=1.45·In in standard MCBs, the condition In ≤ Iz also satisfies the second condition. The smallest value that satisfies Ib is selected from among the standard rated currents. The short-circuit breaking capacity should also be checked.
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🧱Protective/Grounding Conductor Cross-SectionAdiabatic minimum cross-section

Protection/Grounding Conductor Cross-Section (Adiabatic)

Calculate the minimum protective conductor cross-section required for a given fault current and tripping time using an adiabatic equation.

Calculated S_min
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Proposed standard cross-section
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Notes: S = √(I²·t)/k (TS EN 60364-5-54, Annex A). The adiabatic equation is just t ≤ 5 s This applies to; the k value depends on the conductor material and insulation. An alternative simple rule: protective conductor ≥ half of the phase cross-section. The final choice requires engineering verification.
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📏Minimum cable cross-section from target ΔU.The smallest cross-section allowed for %ΔU

Minimum cable cross-section from target voltage drop.

Find the minimum cable cross-section required based on the allowed voltage drop percentage. This is the inverse of the voltage drop tool.

Calculated cross-section
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Standard cross-section
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Allowed ΔU
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Notes: A = k·ρ·L·I·cosφ / ΔU (3F: k=√3, 1F: k=2). It is an omics approach. (Reactance and temperature neglected). The selected cross-section is also current carrying capacity and short-circuit withstand This should also be verified in terms of other criteria — this tool only provides the voltage drop criterion.
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🔥Cable Short Circuit Withstand (I²t)Can the cable survive a short circuit?

Cable Short Circuit Withstand (I²t)

Check whether a cable can thermally withstand a potential short-circuit current and tripping time.

Allowed time
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Cable I²t strength
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Fault I²t
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Notes: The cable strength must be k²·S² ≥ I²·t (TS EN 60364-4-43). The allowable duration is t_max = (k·S/I)². The k value is for the phase conductor. (different from the protective conductor k). The adiabatic approach is valid for t ≤ 5 s; the protective tripping curve should also be evaluated.
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Protective Devices & Security
🛡️Selecting a Residual Current Device (RCD)IΔn threshold and relay type

Selecting a Residual Current Device (RCD)

View the recommended leakage current threshold (IΔn) and relay type according to the intended use and load type.

Leakage current threshold IΔn
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Relay type
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Notes: According to IEC/HD 60364-4-41, for sockets and personnel protection. Additional protection IΔn ≤ 30 mA Recommended; typical 300 mA for fire protection. Type selection depends on the type of leakage current produced by the load: AC (sinusoidal), A (pulsed DC component — electronic), B (straight DC component — inverter), EV charging with Type A + 6 mA DC sensing or Type B. The final choice is determined by the installation conditions.
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🔬Insulation (Megger) Resistance LimitsTest voltage and minimum MΩ

Insulation (Megger) Resistance Limit Values

Check the applicable test voltage and minimum insulation resistance based on the circuit's nominal voltage; compare this to your measured value.

Test voltage
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Minimum insulation resistance
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Notes: The values are IEC/HD 60364-6 (Table) insulation resistance minimums: SELV/PELV → 250 V DC test, ≥ 0.5 MΩ; ≤ 500 V → 500 V DC test, ≥ 1.0 MΩ; > 500 V → 1000 V DC test, ≥ 1.0 MΩ. Measurements are performed separately for phase-to-ground and phase-to-phase; final evaluation depends on field conditions.
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⚠️Arc Flash AwarenessRisk priority and work need

Arc Flash — Awareness Assessment

Assess your arc flash risk awareness based on your system conditions. This tool does not calculate energy (cal/cm²).; It prioritizes only the need for detailed study.

Important: Arc flash incident energy (cal/cm²) and PPE class, only With a detailed arc flash study according to IEEE 1584 / NFPA 70E. It is determined — the actual short-circuit current, the device tripping curve, and the operating distance are required. This tool does not replace this work; it is a preliminary indicator for priority and awareness.
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💥Short Circuit Power & Impedance (Sk/Zk)Ik to Sk and network impedance

Short Circuit Power & Impedance (Sk / Zk)

Calculate the short-circuit power (Sk) and the mains impedance (Zk) from the short-circuit current at a point; or vice versa.

Short circuit power Sk
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Short circuit current Ik
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Impedance Zk
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Notes: Sk = √3·U·Ik · Zk = U/(√3·Ik). Either Ik or Sk is entered, and the other is calculated. The values are for a symmetrical short circuit; the actual fault current varies with the R/X ratio and distance. The circuit breaker breaking capacity (Icu) should be selected based on Ik.
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🌩️SPD / Surge Arrester Selection GuideType according to installation location and risk.

SPD / Surge Arrester Selection Guide

Determine the appropriate type of surge protector (SPD) based on the installation location, lightning risk, and grounding system.

Notes: This is an election guide; The final SPD selection is made according to the TS EN 61643 and TS EN 62305-2 risk analysis standards. The Up (protection level) must be below the surge withstand capability of the equipment to be protected, and the backup fuse should be selected according to the manufacturer's data. The surge arrester is connected with a conductor length not exceeding 0.5 m (V connection).
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🔀Selectivity / Coordination Pre-CheckSelectivity based on current ratio.

Selectivity / Coordination Pre-Check

Preliminarily assess the possibility of selectivity based on the rated current ratio of the upper and lower protective devices.

Rated current ratio
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Notes: This is a preliminary check. The general practical ratio for selectivity in the overload region is ≈ 1.6; Short-circuit selectivity can only be verified using manufacturer selectivity (coordination) tables and tripping curves. Full selectivity can be achieved with current limiting, time-phasing, or zone-selective interlocking (ZSI).
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Transformer & Distribution
🏭Transformer Load & Short Circuit CurrentFull load and approximate short-circuit current

Transformer Full Load & Short Circuit Current

Calculate the full-load current and approximate short-circuit current in the transformer secondary (preliminary information for panel/breaker selection).

Full load current I_n
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Approx. short circuit I_k
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Notes: I_n=S/(√3·U), I_k≈I_n·100/uk. Infinite bar assumption (Network and cable impedance neglected) → Upper limit at secondary terminal; actual fault current decreases with distance. The breaking capacity (Icu) of the circuit breaker should be selected above this value. A complete short-circuit analysis is required for precise coordination.
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⚖️Transformer Load Ratio (%)% load and current according to rated power.

Transformer Load Ratio (%)

Calculate the transformer's percentage load and secondary current based on its rated power; identify over/under loads.

Load rate
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Apparent load S
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Secondary current
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Notes: Yüklenme = (P/cosφ) / S_anma · Sekonder akım = S_yük/(√3·U). Uygun süreklilik aralığı tipik %40–80'dir (verim ve yedek marj açısından); >%100 aşırı yüklenmedir. Kesin değerlendirme yük profili ve ortam sıcaklığına göre yapılır.
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♻️Transformer Loss & Efficiency (Cu+Fe)Iron + copper loss → efficiency

Transformer Loss & Efficiency (Iron + Copper)

From the idle (iron) and load (copper) losses on the label, calculate the total loss and efficiency at your chosen loading configuration.

Yield
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Total loss
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Maximum efficiency load
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Notes: Loss = P₀ + Pk·x² (x = load ratio) · Efficiency = P_output / (P_output + Loss), P_output = S·x·cosφ. Iron loss is load-independent; copper loss increases with the square of the load. Maximum efficiency is at the point x=√(P₀/Pk) where iron and copper losses are equal. P₀ and Pk values are taken from the transformer label.
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📐Transformer Voltage Regulation (%)Secondary voltage drop under load

Transformer Voltage Regulation (%)

Calculate the secondary voltage drop (regulation) under load from the short-circuit voltage and copper loss.

Regulation
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uR (resistive)
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uX (reactive)
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Notes: uR = (Pk/S)·100, uX = √(uk²−uR²), Regulation ≈ x·(uR·cosφ + uX·sinφ) (x = loading ratio). It is a first-order approach. (Second-order term omitted, inductive load assumed). Pk and uk are taken from the transformer label. The exact value is determined using the full equivalent circuit.
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💸Annual Transformer Loss CostIdle + load loss → TL/year

Annual Transformer Loss Cost

Calculate the transformer's annual energy loss and cost, taking into account no-load (iron) and load (copper) losses.

Annual energy loss
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Annual cost
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Iron/Copper share
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Notes: Annual loss = (P₀ + Pk·x²) × hours · Cost = loss × tariff. Iron loss is continuous as long as the transformer is energized; copper loss is proportional to the square of the average load. P₀ and Pk are taken from the label; they are only the cost of loss (excluding distribution/tax).
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🌡️Transformer Cooling / Oil Preliminary AssessmentPriority for fat test / thermography

Transformer Cooling / Oil — Preliminary Assessment

Determine your priority for oil testing/thermography for the transformer based on load, temperature, and maintenance indicators. This preliminary assessment is for awareness purposes.

Important: This preliminary assessment, This does not replace hot-spot/life analysis or laboratory oil testing (DGA, moisture, dielectric strength) performed according to IEEE C57.91 load guidelines; This is for maintenance prioritization purposes only. Hot-spot temperature and remaining life are calculated using actual load profile and transformer data.
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Generator, UPS & On-Demand
🔋Generator Sizing (kVA)Power based on load, concurrency, and margin.

Generator Sizing (kVA)

Calculate the approximate generator power (kVA) based on total load, power factor, simultaneity, and spare margin.

Suggested power
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Effective load (kW)
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Notes: S(kVA) = P × simultaneity × (1 + margin) / cosφ. This vehicle does not include engine starting (starting) current. — For large, directly driven motors, instantaneous demand generation is very demanding and requires separate evaluation. UPS/critical loads and future growth must also be considered.
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⛽Generator Fuel Consumption & AutonomyHourly/daily diesel + tank autonomy

Generator Fuel Consumption & Tank Autonomy

Calculate hourly/daily diesel consumption and tank autonomy based on generator load and specific fuel consumption.

Hourly consumption
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Daily (24 hours)
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Tank autonomy
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Notes: Consumption = load × specific consumption. Specific consumption in a diesel generator is typically 0.25–0.30 L/kWh. (varies depending on load ratio and engine); exact value is taken from the manufacturer's fuel curve. Autonomy = tank / hourly consumption.
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🔌UPS Battery Autonomy TimePower supply time depends on load and battery.

UPS Battery Autonomy Time

Calculate the approximate power supply (autonomy) time of the UPS based on load and battery information.

Approximate autonomy
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Battery power
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Notes: Available energy = V × Ah × string × (DoD/100) × efficiency; time = energy / load. This is an approximate value. — Capacity drop at high current (Peukert effect), battery age and temperature have not been taken into account. Actual autonomy is verified by battery test/discharge measurement.
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🪫UPS Battery Sizing (Ah)Required capacity from the requested time

UPS Battery Sizing (Required Ah)

Calculate the battery capacity (Ah) required for the desired autonomy time. This is the reverse of the UPS autonomy tool: it gives the time and finds the capacity.

Required capacity
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Required energy
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Notes: Required energy = Load × time / efficiency · Ah = energy / (V × DoD). The result is for a battery string. The Peukert effect (capacitance drop at high current) has been neglected; The actual value varies depending on battery age and temperature, and is verified by a discharge test.
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📊Demand Force & SimultaneityDemand power and current from installed power

Demand Force & Simultaneity

Calculate the plant's demand power and approximate demand current by multiplying your installed (connected) power by the simultaneity factor (prior information on main supply, meter, and transformer sizing).

Demand power
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Demand flow
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Notes: Demand power = Installed power × simultaneity factor; I = P/(√3·U·cosφ). The simultaneity factor varies depending on the facility type. (Residential, office, industrial use differs) and must be verified with the actual load profile. This is an estimate; the selection of the main circuit breaker, cable, and transformer will be finalized through engineering calculations.
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Motor & Drive
⚙️Motor Full Load CurrentPower/voltage/cosφ/efficiency from rated current

Motor Full Load Current

Calculate the full-load (nominal) current based on motor power, voltage, power factor, and efficiency. The exact value is on the motor label.

Full load current I_n
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Notes: 3F: I_n=P/(√3·U·cosφ·η); 1F: I_n=P/(U·cosφ·η). The exact value is from the engine label. The current (cosφ) and efficiency vary depending on the motor and load. The thermal relay and cable are selected according to this current.
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🔄Engine Starting Current (DOL)Starting current in direct starting

Engine Starting Current (DOL)

Calculate the approximate starting current drawn by the motor during direct starting (DOL).

DOL starting current
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Notes: Starting current ≈ (Il/In) × I_n. In direct starting, the locked rotor current is typically the rated current. It is 6–8 times greater.; The exact current is found from the code letter on the motor label. Soft-starting methods reduce this current.
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🛡️Thermal Relay AdjustmentRecommended setting for overload relay.

Thermal (Overload) Relay Setting

Find the recommended setting value for the thermal overload relay based on the motor's full load current.

Suggested setting
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Relay range (recommendation)
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Notes: The overload relay is set to the motor's rated current (approximately SF×I_n for motors with a service factor); within the scope of IEC/EN 60947, a relay is selected whose setting range averages this value. Opening class (Class 10 / 20 / 30) It is determined according to the departure time of the cargo.
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🎛️Selection of Departure MethodDOL / star-delta / softstarter / VFD

Engine Starting Method Selection

See the appropriate starting method according to engine power and load type (DOL, star-delta, softstarter, VFD).

Notes: This recommendation is a general guideline; the final choice will be made considering grid constraints, start-up frequency, start-up time, and load moment of inertia. Star-delta configuration is only suitable for no-load/low-load start-ups.
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🔌Motor Compensation (kVAr)Engine power factor correction

Motor Compensation (kVAr)

Calculate the capacitor power required to bring a motor's power factor to its target value.

Required capacitor
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Notes: Qc = P·(tanφ₁−tanφ₂). Avoid overcompensation in the capacitor directly connected to the motor terminal. — The capacitor power should not exceed the motor's no-load magnetization (reactive) power; otherwise, there is a risk of self-excitation and overvoltage. Therefore, the target cosφ is generally kept around 0.95.
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Grounding & Lightning
🌍Grounding Resistance (Rod Electrode)Resistance depends on ρ and rod size.

Grounding Resistance (Rod Electrode)

Calculate the approximate grounding resistance of a single-rod electrode from the soil resistivity and rod dimensions.

Grounding resistance
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The ρ used
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Notes: R = ρ/(2πL)·(ln(8L/d)−1) (BS 7430 / IEEE 142 — vertical bar). Soil resistivity ρ is determined by measurement (Wenner 4-prong method). And it varies depending on the season/humidity; typical values are only indicative. The result is for a single bar. The exact value will be verified by field measurement.
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🌩️Lightning Risk — Preliminary AssessmentPrioritize protection for your building.

Lightning Risk — Preliminary Assessment

Select the essential features of your building; determine your priority in terms of lightning protection. This preliminary assessment is for awareness and prioritization.

Important: This preliminary assessment, Full lightning risk analysis (risk components R1–R4) performed according to TS EN 62305-2. It is not a substitute; it is solely for awareness and prioritization purposes. The Binding Protection Level (LPL) and precautions are determined by a detailed risk analysis conducted with actual building/environmental data. Detailed risk analysis is mandatory in structures containing explosive atmospheres.
Get a quote for detailed TS EN 62305 risk analysis & lightning rod inspection →
🗼Lightning Protection Level (LPL) ParametersRolling ball, net, landing gear

Lightning Protection Level (LPL) Parameters

Select the protection level according to TS EN 62305-3; view the rolling sphere radius, mesh spacing, and down conductor spacing. Optional: calculate the protected radius on the ground by entering the pole/rod height.

Rolling sphere r
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Mesh size
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Down conductor spacing
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Protected ground radius
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Notes: The values correspond to the protection levels of TS EN 62305-3 (Tables 2 & 4). The protection angle depends on the height. (62305-3, Figure 1) and a single value cannot be given. The conserved ground radius is calculated by the rolling sphere method rp=√(2·r·h−h²) (for h≤r) — single rod approximation. The required level of protection comes from risk analysis. (See Lightning Risk Preliminary Assessment); this tool displays the geometric parameters of the selected level.
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🔻Number of Downstream (Downstream) ConductorsNumber according to Environment and LPL

Number of Downstream (Downstream) Conductors

See the approximate number of down conductors required according to the building environment and protection level (LPL) (TS EN 62305-3).

Building surroundings
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Typical distance
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Number of down conductors
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Notes: Number ≈ perimeter / typical intermediate distance (TS EN 62305-3 Table 4: LPL I–II 10 m, III 15 m, IV 20 m), at least 2. Corners and entrances are given priority; The actual site layout is determined based on building geometry, natural components, and risk analysis. This tool provides a preliminary estimate.
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🔗Main Grounding / Equipotential Busbar Cross-SectionPE and busbar from the phase section.

Main Grounding / Equipotential Busbar Cross-Section

View the cross-section of the protective conductor (PE) and the main equipotential bonding conductor from the cross-section of the largest phase conductor (TS EN 60364-5-54).

Protective conductor (PE)
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Main equipotential bus
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Notes: PE rule (TS EN 60364-5-54, 543.1.2): phase S ≤ 16 → PE = S; 16 < S ≤ 35 → PE = 16; S > 35 → PE = S/2. Main equipotential bonding conductor ≥ PE/2, minimum 6 mm² (Cu), upper limit 25 mm² (Cu equivalent). Earthing conductor min 25 mm² Cu (unshielded buried) or 6 mm² (shielded). Copper based; for aluminum/steel, the equivalent is considered.
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Lighting & Efficiency
💡Lighting Compliance (EN 12464-1)Reference luxury and measurement comparison.

Lighting Compliance (EN 12464-1)

Select the area/task type; view the EN 12464-1 reference illuminance level (Em). Optionally, enter and compare the measured lux.

Suggested Em (reference)
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Measured
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Notes: Values according to EN 12464-1. Typical reference preserved illuminance levels (Em); The current edition of the standard and the task vary. This tool only compares average illumination levels; uniformity (Uo), glare (UGR), and color rendering (Ra) It is also evaluated. Accredited lighting measurement. Occupational health and safety environmental measurements This is done in collaboration with a partner laboratory.
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🔆Number of Luminaires (Lumen Method)N = E·A/(Φ·UF·MF)

Number of Luminaires (Lumen Method)

Calculate the target illumination level and the number of luminaires required for the area using the lumen method.

Necessary fixtures
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The actual average
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Notes: N = (E·A) / (Φ·UF·MF). Usage factor (UF) space geometry, reflection and luminaire type; maintenance factor (MF) It depends on contamination/aging — precise values are taken from luminaire efficiency tables. The result is for average illumination; uniformity (Uo) is evaluated separately.
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📊Lighting Power Density (W/m²)Installed power/area + lm/W efficiency

Lighting Power Density (W/m²)

Calculate the power density (W/m²) and, if desired, the average efficiency (lm/W) by dividing the installed lighting power by the area.

Power density
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Average efficiency
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Notes: Power density = total power / area (W/m²) · Efficiency = total lumens / total power (lm/W). Low W/m² indicates sufficient illumination and efficient installation. The binding limit varies according to the standard/project (EN 15193 — LENI); modern LED efficiency is typically above 100 lm/W.
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💰LED Conversion Payback (ROI)Annual savings and repayment

LED Conversion Payback (ROI)

Calculate the annual savings and payback period of converting existing fixtures to LED.

Annual savings
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Annual energy savings
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Refund period
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Notes: Annual savings = units × (Pcurrent − PLED) / 1000 × hours × 365 × tariff. The calculation assumes 365 days of operation per year; actual savings will vary depending on the operating schedule, maintenance costs, and luminaire lifespan. The lighting level (lux) must be maintained — see diagram. Lighting Suitability.
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🔦Emergency/Escape Lighting (EN 1838)Minimum luxury + measurement comparison

Emergency/Escape Lighting (EN 1838)

Check the EN 1838 minimum emergency lighting reference according to the area type; compare it to the lux you measured.

EN 1838 minimum reference
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Measured
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Notes: EN 1838 minimum values: Escape route axis 1 lx, open area (anti-panic) 0.5 lx, high-risk mission area 15 lx (sürekli aydınlığın en az %10'u). Bunlar asgari korunan değerlerdir; Duration (typically 1 hour), smoothness (escape route ≤ 40:1), and activation time must also be provided. The final design is in accordance with the project and relevant regulations.
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Energy Efficiency & Production
🎚️VFD Energy Saving (Affinity)Pump/fan savings through speed control.

VFD (Frequency Inverter) Energy Saving

Calculate the approximate energy savings achievable with velocity control (VFD) in a pump/fan application using the law of affinity.

Power via VFD
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Saving power
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Annual energy savings
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Notes: Law of affinity: pump/fan power varies with the cube of speed (P ∝ n³). When the speed drops to %r, the power becomes P·r³; in the throttling (valve/damper) method, the power remains approximately constant, the difference being a saving. Since static height and system curve are neglected, the result is an upper limit; Actual savings are verified through field measurements.
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☀️Annual Production Forecast for Solar Power PlantskWp → annual kWh and revenue

Annual Solar Power Generation Estimate

Estimate the approximate annual output of a rooftop/ground-mounted solar power system from installed capacity (kWp), equivalent sunshine hours, and performance ratio.

Annual production
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Specific production
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Annual income
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Notes: Production = kWp × PSH × 365 × PR. PSH (equal sun exposure time) varies by region. (Typical data for Turkey is 4–5 hours; taken from PVGIS/meteorological data). PR (performance ratio) includes temperature, shading, loss, and yield (typically 0.75–0.85). The result is an estimate; exact production will be determined by field study.
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💧Pump Motor Power (Hydraulic)Flow rate/height and shaft and motor power

Pump Motor Power (Hydraulic → Shaft / Motor)

Calculate the pump's hydraulic power, shaft power, and required motor power from the flow rate and head.

Hydraulic power
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Spindle power
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Recommended engine
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Notes: Hydraulic power (kW) = Q·H/367 (Q: m³/hr, H: m, for water) · Shaft = hydraulic/pump efficiency · Motor = shaft/motor efficiency. Cavitation/NPSH, system losses, and starting torque are also evaluated; motor için ayrıca marj (tipik %10–15) önerilir. Sonuç seçim için ön bilgidir.
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💹Simple Return on Investment (ROI)Payback period and return

Simple Return on Investment (Payback / ROI)

Calculate the payback period and simple return on an energy efficiency investment.

Refund period
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Simple annual return
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Lifetime net income
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Notes: Payback = investment / annual savings · Simple return = savings / investment. It is a simple method (excluding the time value of money); Inflation, tariff increases, maintenance, and discounts (NPV/IRR) are not included. Annual savings should be realistic and verifiable.
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Occupational Safety and Health & Measurement
🔊Daily Noise Exposure (LEX, 8h)Action values 80/85/87 dB(A)

Daily Noise Exposure (LEX, 8h)

Calculate the daily noise exposure, normalized to 8 hours, from the measured noise level and exposure time, and compare it to the action values.

LEX, 8h
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Notes: LEX, 8h = L + 10·log₁₀(T/8). Action values (Regulation on the Protection of Workers from Risks Related to Noise / 2003/10/EC): lower action 80, upper action 85, exposure limit value 87 dB(A) (The limit value applies to the ear, including PPE). This is for a single noise source; a combined calculation is required for different levels.
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🔬Insulation Polarization Index (PI/DAR)Insulation with time-resistance ratio

Insulation Polarization Index (PI/DAR)

Calculate the polarization index (PI) and dielectric absorption ratio (DAR) from time-lapse insulation resistance measurements; evaluate the insulation condition.

Polarization Index (PI)
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NARROW
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Notes: PI = R(10 min) / R(1 min) · DAR = R(1 min) / R(30 sec). Overall assessment (IEEE 43): PI <1 risky, 1–2 questionable, 2–4 good, >4 excellent. In modern low-absorption insulation, low PI is also acceptable due to high initial resistance; the result is evaluated in conjunction with temperature and humidity.
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📳Vibration Exposure A(8)Arm/whole body action limit

Vibration Exposure A(8)

Calculate daily vibration exposure normalized to 8 hours from vibration magnitude and exposure time; compare with action/limit values.

A(8)
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Action Value (EAV)
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Limit Value (ELV)
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Notes: A(8) = a × √(T/8). Values (Vibration Directive / 2002/44/EC): hand-arm EAV 2.5 – ELV 5.0 m/s²; whole body EAV 0.5 – ELV 1.15 m/s². This is for a single source; a combined account is required for different jobs. Measurement is performed using the ISO 5349 (hand-arm) / ISO 2631 (whole body) method.
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These guidelines are for general information purposes only and do not constitute a binding inspection/declaration of conformity. Definitive results will be determined by on-site inspection in accordance with relevant legislation and standards. For detailed evaluation, please refer to the relevant documentation. You can get an offer..