NFPA 70B, Standard for Electrical Equipment Maintenance
Updated 2026-10-27
| Standard | Edition | Kind | Current | Record |
|---|---|---|---|---|
| NFPA 70B, Standard for Electrical Equipment Maintenance | 2019 | Edition | std.nfpa-70b.edition.2019 | |
| NFPA 70B, Standard for Electrical Equipment Maintenance | 2023 | Edition | std.nfpa-70b.edition.2023 | |
| NFPA 70B, Standard for Electrical Equipment Maintenance | 2026 | Edition | Yes | std.nfpa-70b.edition.2026 |
Data records
- The NFPA standard development page offers NFPA 70B for purchase, through the NFPA LiNK subscription, and in a free online view that requires an NFPA sign-in.
- The 2026 revision of NFPA 70B was prepared by the Electrical Equipment Maintenance technical committee (EEM-AAA), with correlation by the National Electrical Code correlating committee (NEC-AAC); the first draft meeting was held in March 2024 and the second draft meeting in March 2025.
- Under clause 9.2 of NFPA 70B-2026, the owner or a designee assesses equipment condition three ways, by physical condition, criticality and operating environment, and the overall condition is the least favorable of the three; condition 1 is the most favorable rating and condition 3 the least.
- Clause 9.2.2 of NFPA 70B-2026 has the owner assign the criticality rating, one of the three condition ratings, on grounds of operational reliability or business continuity.
- Under clause 9.2.3 of NFPA 70B-2026, the operating-environment rating takes one of the two more favorable conditions where the equipment is used in an environment it is rated for, and the least favorable condition where it is exposed to harsh chemicals, contaminants or extreme conditions it is not rated or evaluated for.
- Under clause 9.2.1.4 of NFPA 70B-2026, equipment showing signs of impending failure that could injure people or harm health or the environment is de-energized and marked nonserviceable, with exceptions where de-energizing adds hazard or is not feasible, and people are protected until the repair is made.
- Clause 9.2.1.1 of NFPA 70B-2026 assigns physical condition 1 to equipment that is in like-new condition, has a clean, dry and tight enclosure, has no unaddressed monitoring notifications or open recommendations from maintenance or predictive work, and has had its prior maintenance done under the electrical maintenance program.
- Clause 9.2.1.2 of NFPA 70B-2026 assigns physical condition 2 to equipment that still meets the like-new, enclosure and prior-maintenance criteria but shows any of: results that deviate from past results or call for more frequent maintenance under manufacturer data, major repair or replacement in the previous cycle, monitoring notifications since the last assessment, or open recommendations.
- Clause 9.2.1.3 of NFPA 70B-2026 assigns physical condition 3 to equipment whose operation has changed, or that shows any of: the last two maintenance cycles missed, major repair or replacement in both of the previous two cycles, an active or unaddressed monitoring notification, or urgent actions identified.
- The publisher states that NFPA 70B is developed through an ANSI-accredited consensus process with subject matter experts from industry, enforcement, engineering and safety organizations.
- NFPA 70B is the designation of the NFPA standard for electrical equipment maintenance; the publisher's product page lists the 2026 edition under stock number 70B26. Value: NFPA 70B.
- The 2019 edition of NFPA 70B, which the 2023 edition revises, carried the title Recommended Practice for Electrical Equipment Maintenance; it in turn revised the 2016 edition. Value: 2019.
- The 2023 edition of NFPA 70B is the edition the 2026 edition revises; the publisher lists it as NFPA 70B, Standard for Electrical Equipment Maintenance, 2023, under stock number 70B23. Value: 2023.
- The 2026 edition of NFPA 70B was issued by the NFPA Standards Council on November 19, 2025 and took effect on December 9, 2025; it was processed as a consent standard, with no motions received for the NFPA technical meeting. Value: 2026.
- The publisher describes NFPA 70B as a framework for formalizing maintenance responsibilities through the development and implementation of an electrical maintenance program (EMP), and lists EMP development, maintenance intervals, testing methods and documentation practices as the matters the standard addresses.
- Clauses 9.4.1 and 9.4.2 of NFPA 70B-2026 require the electrical maintenance program to carry a timeline for repairs, with the severity of a defect and the physical condition of the equipment setting how soon a repair is scheduled.
- Clause 9.1.2.2 of NFPA 70B-2026 allows the maintenance cycle to be extended beyond the table interval after more than two intervals in which no problems were found.
- Under clause 9.3.2.3 of NFPA 70B-2026, any extension of an interval beyond the table, together with its justification, is recorded in the electrical maintenance program.
- Under clause 9.1.2.1 of NFPA 70B-2026, once an initial maintenance frequency has been set from the table and the condition assessment, it is kept for at least two intervals unless unexpected failures occur.
- Under clause 9.3.1 of NFPA 70B-2026, the manufacturer's instructions govern the scope and interval of maintenance wherever such instructions exist.
- Clause 9.1.1 of NFPA 70B-2026 permits continuous monitoring and predictive techniques, including the P-F curve method described in clause 9.1.1.3, to set maximum maintenance intervals on the basis of manufacturer recommendations or accepted practice.
- Under clause 9.1.2.1.2 of NFPA 70B-2026, after more than two intervals have passed without additional service being needed, the original maintenance interval may be resumed.
- Clause 9.3.2.2 of NFPA 70B-2026 allows a maintenance interval to be altered on the basis of the risk that a failure of the equipment would pose to people or to operations.
- Clause 9.3.2.1 of NFPA 70B-2026 makes the Table 9.3.2 intervals a requirement only where another chapter of the standard refers to them.
- Under clause 9.3.2 of NFPA 70B-2026, where manufacturer instructions are absent and predictive techniques are not in use, maintenance is performed at no more than the Table 9.3.2 interval for the equipment's assessed condition; the table values are maximum intervals selected by condition column.
- Clause 9.1.2.1.1 of NFPA 70B-2026 makes an unexpected failure the trigger for a review of whether the maintenance interval must be reduced, judged on the cause of the failure.
- The publisher lists the key aspects of the 2023 edition of NFPA 70B as a structured electrical maintenance program with defined responsibilities, equipment surveys, maintenance priorities, documented procedures, inspections, servicing, testing and record retention; a defined condition of maintenance; risk-informed prioritization of maintenance from equipment surveys and analysis; documented maintenance and corrective-action processes; and maintainability in installation design with periodic review and revision of the program.
- The ANSI webstore listing for NFPA 70B-2023 records that it revises NFPA 70B-2019 and is revised by NFPA 70B-2026.
- NFPA 70B covers preventive maintenance for electrical, electronic and communication systems and equipment of the kinds installed in industrial plants, institutional and commercial buildings and large multifamily residential complexes, with the stated aim of preventing equipment failures and injuries to workers.
- The publisher's abstract of the 2019 edition states that the document is not meant to duplicate or supersede the instructions that manufacturers normally provide, and that consumer appliances and equipment intended primarily for use in the home are not included.
- The NFPA standard development page lists NFPA 70B as active, with 2026 as its current edition. Value: current edition.
- Annex I of NFPA 70B-2026 addresses reliability-centered maintenance.
- Table 15.3.5, Table 17.3.5, Table 35.3.5 and Table 39.3.5 of NFPA 70B-2026 each carry an item that tests arc reduction technology following the manufacturer's instructions; none of the four states an interval of its own.
- Chapter 10 of NFPA 70B-2026 covers the maintenance of electrical equipment in hazardous (classified) locations.
- Chapter 11 of NFPA 70B-2026 covers the maintenance of power and distribution transformers. Its electrical tests are listed in Table 11.3.5.
- Chapter 12 of NFPA 70B-2026 covers the maintenance of substations and switchgear. Its electrical tests are listed in Table 12.3.5.
- Chapter 13 of NFPA 70B-2026 covers the maintenance of panelboards and switchboards. Its electrical tests are listed in Table 13.3.5.
- Chapter 14 of NFPA 70B-2026 covers the maintenance of busways. Its electrical tests are listed in Table 14.3.5.
- Chapter 15 of NFPA 70B-2026 covers the maintenance of low- and medium-voltage circuit breakers: section 15.3 holds the periodic maintenance procedures for molded-case, insulated-case and low-voltage power circuit breakers and section 15.4 those for medium-voltage power circuit breakers, with electrical tests in Table 15.3.5 and Table 15.4.5.
- Chapter 16 of NFPA 70B-2026 covers the maintenance of fuses. Its electrical tests are listed in Table 16.3.5.
- Chapter 17 of NFPA 70B-2026 covers the maintenance of switches. Its electrical tests are listed in Table 17.3.5.
- Chapter 18 of NFPA 70B-2026 covers the maintenance of power cables and conductors. Its electrical tests are listed in Table 18.3.5.
- Chapter 19 of NFPA 70B-2026 covers the maintenance of cable tray. Its electrical tests are listed in Table 19.3.5.
- Chapter 20 of NFPA 70B-2026 covers the maintenance of grounding and bonding. Its electrical tests are listed in Table 20.3.5.
- Chapter 21 of NFPA 70B-2026 covers the maintenance of ground-fault circuit interrupters and ground-fault protection of equipment systems. Its electrical tests are listed in Table 21.3.2.5.
- Chapter 22 of NFPA 70B-2026 covers the maintenance of lighting.
- Chapter 23 of NFPA 70B-2026, the place held for lighting control systems, is reserved in the 2026 edition and carries no sections or tests.
- Chapter 24 of NFPA 70B-2026 covers the maintenance of wiring devices. Its electrical tests are listed in Table 24.3.5.
- Chapter 25 of NFPA 70B-2026 covers the maintenance of uninterruptible power supplies. Its electrical tests are listed in Table 25.3.5.
- Chapter 26 of NFPA 70B-2026, the place held for electronic equipment, is reserved in the 2026 edition and carries no sections or tests.
- Chapter 27 of NFPA 70B-2026 covers the maintenance of rotating equipment. Its electrical tests are listed in Table 27.3.5.
- Chapter 28 of NFPA 70B-2026 covers the maintenance of motor control equipment. Its electrical tests are listed in Table 28.3.5.
- Chapter 29 of NFPA 70B-2026 covers the maintenance of portable electrical tools and equipment.
- Chapter 30 of NFPA 70B-2026 covers the maintenance of photovoltaic systems. Its electrical tests are listed in Table 30.3.5.
- Chapter 31 of NFPA 70B-2026 covers the maintenance of wind power electric systems and associated equipment. Its electrical tests are listed in Table 31.3.5, and the chapter also carries a table of visual inspections and mechanical tests, Table 31.3.1.
- Chapter 32 of NFPA 70B-2026 covers the maintenance of battery energy storage systems. Its electrical tests are listed in Table 32.3.5.
- Chapter 33 of NFPA 70B-2026 covers the maintenance of electric vehicle power transfer systems and associated equipment.
- Chapter 34 of NFPA 70B-2026 covers the maintenance of public pools, fountains and similar installations. Its electrical tests are listed in Table 34.3.5.
- Chapter 35 of NFPA 70B-2026 covers the maintenance of protective relays. Its electrical tests are listed in Table 35.3.5.
- Chapter 36 of NFPA 70B-2026 covers the maintenance of stationary standby batteries. Its electrical tests are listed in Table 36.3.5.
- Chapter 37 of NFPA 70B-2026, the place held for instrument transformers, is reserved in the 2026 edition and carries no sections or tests.
- Chapter 38 of NFPA 70B-2026, the place held for control power transformers, is reserved in the 2026 edition and carries no sections or tests.
- Chapter 39 of NFPA 70B-2026 covers the maintenance of transfer switch equipment. Its electrical tests are listed in Table 39.3.5.
- Chapter 9 of NFPA 70B-2026 holds the maintenance-interval framework: how equipment condition is assessed, how the interval table is applied and when an interval may be shortened or extended.
- Each equipment chapter of NFPA 70B-2026 follows one pattern: a scope section, a frequency-of-maintenance section and periodic maintenance procedures subdivided into visual inspection, cleaning, lubrication, mechanical servicing, electrical testing and special; a subdivision that does not apply to the equipment class is marked reserved.
- The electrical testing subdivision of an equipment chapter of NFPA 70B-2026 carries a table of named tests, with a column for each equipment type the chapter covers that assigns a test type to the test or marks it not applicable.
- NFPA 70B-2026 opens with nine general chapters; the equipment-specific chapters begin at Chapter 10 and run through Chapter 39, and Annexes A through M follow them.
- Table 9.3.2 of NFPA 70B-2026 is arranged by product and scope of work with three condition columns and states its maximum intervals in months unless noted; most rows share one pattern across the three columns and the visual inspection rows of the equipment that needs closer watching run shorter, as summarized in the datum value, while the full table is not reproduced here. Value: most rows 60 / 36 / 12 months; inspection rows 12 / 12 / 6 months (condition 1 / 2 / 3).
- NFPA 70B is titled Standard for Electrical Equipment Maintenance on the publisher's product page for its 2026 edition. Value: NFPA 70B, Standard for Electrical Equipment Maintenance.
- The publisher lists the updates in the 2026 edition of NFPA 70B as improved consistency between chapters, tables and terminology; a potential failure to functional failure (P-F) curve method for determining maximum equipment maintenance intervals; a new requirement to establish a timeline so that necessary repairs or corrections are not delayed; added details or clarifications to most tasks in the inspection and testing tables of the equipment chapters; and a new chapter 39 on transfer switches.
Sources
- NFPA 70B, NFPA 70B Standard Development, 2026 edition, NFPA. Held as: Public page. Publisher page
- NFPA 70B-2019, NFPA 70B Recommended Practice for Electrical Equipment Maintenance, 2019 edition, 2019 edition, NFPA. Held as: Public page. Publisher page
- NFPA 70B-2023, NFPA 70B, Standard for Electrical Equipment Maintenance (2023), 2023 edition, NFPA. Held as: Public page. Publisher page
- NFPA 70B-2023, NFPA 70B-2023 (ANSI webstore listing), 2023 edition, NFPA. Held as: Public page. Publisher page
- NFPA 70B-2026, Standard for Electrical Equipment Maintenance, 2026 edition, NFPA. Cited: clause 9.2; clause 9.2.2; clause 9.2.3; clause 9.2.1.4; clause 9.2.1.1; clause 9.2.1.2; clause 9.2.1.3; clause 9.4.1; clause 9.1.2.2; clause 9.3.2.3; clause 9.1.2.1; clause 9.3.1; clause 9.1.1; clause 9.1.2.1.2; clause 9.3.2.2; clause 9.3.2.1; clause 9.3.2; clause 9.1.2.1.1; clause Annex I; clause Tables 15.3.5, 17.3.5, 35.3.5, 39.3.5; clause Chapter 10; clause Chapter 11; clause Chapter 12; clause Chapter 13; clause Chapter 14; clause Chapter 15; clause Chapter 16; clause Chapter 17; clause Chapter 18; clause Chapter 19; clause Chapter 20; clause Chapter 21; clause Chapter 22; clause Chapter 23; clause Chapter 24; clause Chapter 25; clause Chapter 26; clause Chapter 27; clause Chapter 28; clause Chapter 29; clause Chapter 30; clause Chapter 31; clause Chapter 32; clause Chapter 33; clause Chapter 34; clause Chapter 35; clause Chapter 36; clause Chapter 37; clause Chapter 38; clause Chapter 39; clause Chapter 9; clause Chapters 10 to 39; clause Chapters 1 to 9; clause Table 9.3.2. Held as: Purchased single-user copy.
- NFPA 70B-2026, NFPA 70B, Standard for Electrical Equipment Maintenance (2026), 2026 edition, NFPA. Held as: Public page. Publisher page
Obtaining the documents
- NFPA 70B (2026): publisher catalog or sales page
- NFPA 70B-2019: publisher catalog or sales page
- NFPA 70B-2023: publisher catalog or sales page
- NFPA 70B-2023: publisher catalog or sales page
- NFPA 70B-2026: publisher catalog or sales page
- NFPA 70B-2026: publisher catalog or sales page
Changelog (70 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (std.nfpa-70b.access) | |
| 2026-10-27 | created (std.nfpa-70b.committees) | |
| 2026-10-27 | created (std.nfpa-70b.condition.assessment) | |
| 2026-10-27 | created (std.nfpa-70b.condition.criticality) | |
| 2026-10-27 | created (std.nfpa-70b.condition.environment) | |
| 2026-10-27 | created (std.nfpa-70b.condition.impending-failure) | |
| 2026-10-27 | created (std.nfpa-70b.condition.physical-1) | |
| 2026-10-27 | created (std.nfpa-70b.condition.physical-2) | |
| 2026-10-27 | created (std.nfpa-70b.condition.physical-3) | |
| 2026-10-27 | created (std.nfpa-70b.consensus) | |
| 2026-10-27 | created (std.nfpa-70b.designation) | |
| 2026-10-27 | created (std.nfpa-70b.edition.2019) | |
| 2026-10-27 | created (std.nfpa-70b.edition.2023) | |
| 2026-10-27 | created (std.nfpa-70b.edition.2026) | |
| 2026-10-27 | created (std.nfpa-70b.emp) | |
| 2026-10-27 | created (std.nfpa-70b.emp.repair-timeline) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.extension-after-clean-cycles) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.extension-record) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.initial-frequency-hold) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.manufacturer-instructions) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.predictive-techniques) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.resume-original) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.risk-adjustment) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.table-applicability) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.table-maximums) | |
| 2026-10-27 | created (std.nfpa-70b.intervals.unexpected-failure-review) | |
| 2026-10-27 | created (std.nfpa-70b.key-aspects.2023) | |
| 2026-10-27 | created (std.nfpa-70b.revises) | |
| 2026-10-27 | created (std.nfpa-70b.scope) | |
| 2026-10-27 | created (std.nfpa-70b.scope.exclusions) | |
| 2026-10-27 | created (std.nfpa-70b.status) | |
| 2026-10-27 | created (std.nfpa-70b.structure.annex-i) | |
| 2026-10-27 | created (std.nfpa-70b.structure.arc-reduction-items) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-10) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-11) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-12) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-13) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-14) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-15) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-16) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-17) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-18) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-19) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-20) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-21) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-22) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-23) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-24) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-25) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-26) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-27) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-28) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-29) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-30) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-31) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-32) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-33) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-34) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-35) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-36) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-37) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-38) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-39) | |
| 2026-10-27 | created (std.nfpa-70b.structure.chapter-9) | |
| 2026-10-27 | created (std.nfpa-70b.structure.common-sections) | |
| 2026-10-27 | created (std.nfpa-70b.structure.electrical-tests-tables) | |
| 2026-10-27 | created (std.nfpa-70b.structure.general-chapters) | |
| 2026-10-27 | created (std.nfpa-70b.table-9-3-2.shape) | |
| 2026-10-27 | created (std.nfpa-70b.title) | |
| 2026-10-27 | created (std.nfpa-70b.updates.2026) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"NFPA 70B, Standard for Electrical Equipment Maintenance." Electrical Maintenance Reference. 2026-10-27. https://www.electricalmaintenancereference.com/standards/nfpa-70b/.
Electrical Maintenance Reference, NFPA 70B, Standard for Electrical Equipment Maintenance (Oct. 27, 2026), https://www.electricalmaintenancereference.com/standards/nfpa-70b/.
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organization = {Electrical Maintenance Reference},
publisher = {Electrical Maintenance Reference},
year = {2026},
note = {last substantive change 2026-10-27}
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