What is NFPA 70B?

NFPA 70B is a document published by the National Fire Protection Association that focuses on the maintenance of electrical equipment. Its purpose is to define how to establish and operate an electrical preventive maintenance program that will ensure the reliable, safe, and predictable operation of electrical distribution equipment in facilities.

At the heart of the standard is the EPM (Electrical Preventive Maintenance) program. This program structures which equipment should be inspected and tested, by what method, how often, and how the results should be documented. Thus, maintenance moves beyond post-failure intervention and becomes a planned and evidence-based process.

  • Focus: reliability and maintenance of electrical equipment (not human safety).
  • Application areas: industrial facilities, commercial buildings, infrastructure, and critical electrical systems.
  • Output: a documented, ongoing maintenance program.

2023 Edition: Transition from Recommendation to Standard

For many years, NFPA 70B was a "recommended practice," meaning it provided guidance but was not binding. With the 2023 edition, the document was officially elevated to "standard" status.

The most tangible reflection of this transition is the change in the language of the text: suggestive statements such as “should/may” have been replaced with obligatory statements such as “shall”. Thus, the document has become an enforceable standard that describes, in the form of clear obligations, how a maintenance program should be established.

An important nuance here is that the use of "mandatory language" does not automatically mean the standard is legally binding everywhere. The fact that the text is written in mandatory language ensures that it is directly applicable/referenced when a regulatory authority or contract refers to it. Indeed, in the US, OSHA (Occupational Safety and Health Administration) considers NFPA 70B as an accepted technical basis (good engineering practice/standard maintenance level) for the expectation of maintaining electrical equipment.

  • Before 2023: “recommended practice”.
  • After 2023: “standard”, compulsory language (shall).
  • Mandatory language does not automatically mean a legal requirement in every country; it becomes binding when referenced.

EPM Program and its Benefits

The rationale behind an Electrical Preventive Maintenance (EPM) program is simple: the vast majority of electrical faults can be detected and prevented in advance through regular and proper maintenance. Loose connections, overheating points, insulation degradation, and aging protective devices are major sources of sudden shutdowns and fire risks.

A well-designed EPM (Electricity Maintenance) program protects business continuity by reducing unplanned downtime, extends equipment life, improves energy efficiency, and provides a maintenance record that serves as evidence in insurance and audit processes following a potential incident.

  • Failure prevention: early detection of problems before they progress.
  • Business continuity: reduced unplanned shutdowns and production losses.
  • Service life: longer and more reliable use of the equipment.
  • Evidence and compliance: documented maintenance history for insurance, inspection, and good engineering practices.

Scope of Inspection and Testing

NFPA 70B comprehensively addresses inspection and testing activities to be carried out according to equipment type. These activities range from visual inspection to measurement-based electrical testing. The following headings are examples of technical activities commonly encountered in an EPM program.

The content and frequency of tests are determined by factors such as the physical condition of the equipment, its criticality, and the operating environment. This approach reflects a condition-based maintenance philosophy that relies on the actual state of the equipment rather than a fixed schedule.

  • Thermographic (infrared) inspection: contactless detection of overheating connections and components.
  • Connection torque check: checking for loose/overtight connections.
  • Insulation resistance measurement: evaluation of cable, winding, and insulation integrity.
  • Protection relay testing and coordination check: verifying that the overcurrent/short circuit protection is functioning correctly.
  • Power quality measurement: examination of harmonics, voltage fluctuations, and imbalances.
  • Condition-based maintenance: determining the maintenance interval and scope based on measurement data.

The Turkish Context: Relationship with Local Periodic Inspection Legislation

NFPA 70B is a US standard and not a current regulation in Türkiye; as a voluntary standard, it is mostly referenced in international projects, specifications, or corporate best practice objectives. In Türkiye, the periodic inspection of electrical installations and work equipment is regulated by local legislation.

The relevant framework is the Regulation on Health and Safety Requirements in the Use of Work Equipment (first published in the Official Gazette dated 25.04.2013 and numbered 28628). This regulation mandates periodic inspections for work equipment and installations. With the amendment published in the Official Gazette dated 23.12.2025 and numbered 33116, regulations such as clarifying the definition of "equipment inspection body," ensuring registration/traceability via the OHS-KATIP system, and setting a deadline of 1/1/2027 for the transition to TS EN ISO/IEC 17020 accreditation for inspection bodies have been introduced.

The two frameworks are not interchangeable; they complement each other. Local legislation sets the minimum legal requirement for periodic inspections. NFPA 70B, however, builds upon these mandatory inspections by offering a broader and continuous preventive maintenance program that enhances equipment reliability. A facility can use NFPA 70B as a voluntary reference to improve its own maintenance maturity while fulfilling its legal periodic inspection obligations.

  • NFPA 70B: voluntary/international standard, not mandatory legislation in Türkiye.
  • Local requirement: Regulation No. 28628/25.04.2013 (Work Equipment), amendment No. 33116/23.12.2025.
  • Key changes include: definition of equipment inspection organization, OHS-KATIP (Occupational Health and Safety Information System), and the transition to regulation 17020 by 1/1/2027.
  • Relationship: local control provides a mandatory basis; NFPA 70B offers a supplementary, voluntary program framework.

AES Approach and Scope Commentary

AES handles NFPA 70B referenced studies within a technical evaluation/information framework. In this context, authorized engineers (mechanical/electrical engineers) evaluate the equipment's condition, maintenance intervals, and test findings using the NFPA 70B approach and report them in a technical report.

This work is not an accredited inspection or certification for NFPA 70B. AES's TÜRKAK accreditation scope is limited only to the "6.1 Electrical Installation" area; NFPA 70B is outside this accreditation scope. Therefore, the output under NFPA 70B is not an accredited inspection report, but rather an authorized engineer's technical assessment/report.

  • Framework: Technical assessment/information referenced in NFPA 70B.
  • Output: Technical report from an authorized engineer (mechanical/electrical engineer).
  • Limitation: There is no accreditation, certification, or accreditation for NFPA 70B.
  • The scope of accreditation is limited to section 6.1 Electrical Installations only.

Information Note

This page is for informational purposes only; it does not constitute a binding opinion, commitment, or statement of conformity for any particular facility, equipment, or situation. Editions of standards and regulatory provisions may be updated over time; the final assessment should always be based on current texts and site conditions.

The technical assessment under NFPA 70B must be carried out by a mechanical/electrical engineer (certified engineer) competent in the relevant discipline. Implementation decisions should be made taking into account the project-specific specifications and applicable local legislation.

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Frequently Asked Questions

Is NFPA 70B mandatory?

NFPA 70B is a US standard and not a direct piece of legislation in Türkiye; it is referenced as a voluntary/international standard. With the 2023 edition, it was upgraded from "recommended practice" to "standard" and acquired mandatory language (shall); however, this does not automatically mean legal obligation. It may become binding when a contract, specification, or regulatory authority refers to it. In Türkiye, the binding legislation is the local legislation regarding the periodic inspection of work equipment.

What is the difference between NFPA 70B and NFPA 70E?

These are two separate standards. NFPA 70E focuses on electrical work safety (worker safety, arc flash risk, personal protective equipment). NFPA 70B focuses on the reliability and preventive maintenance of electrical equipment; that is, it defines what, how, and how often maintenance should be performed. This page is about NFPA 70B (equipment maintenance). The two standards are not competing but complementary: one aims to ensure the work is done safely, the other aims to keep the equipment in a safe condition.

How often should maintenance and check-ups be performed?

NFPA 70B does not impose a single fixed schedule; it uses a condition-based approach that determines intervals based on the physical condition, criticality, and operating environment of the equipment. For example, infrared (thermographic) inspection may be recommended typically every 12 months for equipment in better condition, and at shorter intervals for equipment in more demanding conditions. The exact intervals should be determined based on the equipment type and condition assessment.

What tests and examinations does an EPM program include?

A typical Electrical Preventive Maintenance program includes thermographic (infrared) inspection, connection torque testing, insulation resistance measurement, protective relay testing and coordination check, power quality measurement, and condition-based maintenance decisions based on these findings. The scope is tailored to the equipment type and the risk profile of the facility.

Does AES conduct this assessment?

AES handles NFPA 70B reference work within the framework of a technical assessment/report conducted by a qualified engineer (mechanical/electrical engineer). This is not an accredited inspection or certification; no certificate/document is issued for NFPA 70B. AES's TÜRKAK accreditation scope is limited solely to 6.1 Electrical Installations, and NFPA 70B is outside this scope.

Does NFPA 70B replace the periodic inspection obligation in Türkiye?

No. In Türkiye, the periodic inspection of work equipment is a legal requirement regulated by the Regulation on Health and Safety Conditions in the Use of Work Equipment (25.04.2013/28628; amendment no. 23.12.2025/33116). NFPA 70B does not replace this requirement; it offers a voluntary preventive maintenance framework that complements it.