Standards register
The editions we track, and how sure we are
One place for edition years so the rest of the site can cite standards by designation. Verified against the publisher on the date shown; anything we could not confirm is marked.
Applicable listings, standards and design requirements depend on equipment type, configuration, project specifications and jurisdiction. Nothing on this page states that any Apex Power Distribution product complies with, is listed to, or is certified to any standard. The edition invoked by the contract documents governs, and it is often earlier than the latest published edition.
Applies to:LV power switchgearMV metal-cladMV metal-enclosedArc flash & safetyCircuit breakersProtection & relaysCybersecurityLV switchboardsTransfer switchesControl panelsCodes
| Designation | Current edition | Scope | Applies to | Notes | Status |
|---|---|---|---|---|---|
| IEEE C37.20.1 | 2026 | Metal-enclosed low-voltage (1000 V ac and below, 3200 V dc and below) power circuit breaker switchgear: service conditions, ratings, insulation, construction and test procedures. | LV power switchgear | Board approved 2026-02-12, published 2026-07-30. Supersedes C37.20.1-2015 and amendment C37.20.1a-2020. The 2026 edition adds low-voltage ac definite-purpose switching devices to the scope. Newly published; many specifications and test reports still cite the 2015 edition. | ● Verified |
| IEEE C37.20.2 | 2025 | Metal-clad switchgear rated 4.76 kV to 48.3 kV with drawout electrically operated circuit breakers and main bus ratings of 1200 A to 4000 A. | MV metal-clad | Board approved 2025-12-10, published 2026-06-30. Supersedes C37.20.2-2022 (which had absorbed amendment C37.20.2a-2020). Newly published; expect specifications to reference the 2022 edition for some time. | ● Verified |
| IEEE C37.20.3 | 2023 | Metal-enclosed interrupter switchgear rated above 1 kV ac up to and including 48.3 kV ac, using interrupter switches, selector switches, power fuses and fixed circuit breakers. | MV metal-enclosed | Supersedes C37.20.3-2013 (previously titled 1 kV to 38 kV). No active revision project listed by IEEE SA. | ● Verified |
| IEEE C37.20.7 | 2024 | Recommended practice for testing switchgear rated up to 52 kV for internal arcing faults, including accessibility types and pass criteria for arc-resistant designs. | LV power switchgear, MV metal-clad, MV metal-enclosed, Arc flash & safety | Board approved 2024-09-26, published 2025-03-07. Retitled from Guide to Recommended Practice. Supersedes C37.20.7-2017 and its Corrigendum 1-2021. | ● Verified |
| IEEE C37.13 | 2024 | Low-voltage ac (1058 V and below) power circuit breakers used in enclosures: ratings, construction, temperature limits and test procedures for stationary and drawout, fused and unfused breakers. | Circuit breakers, LV power switchgear | Board approved 2024-11-12, published 2024-12-20. Supersedes C37.13-2015. Companion C37.13.1 (definite-purpose switching devices) shows a 2025 edition in distributor listings; not independently verified. | ● Verified |
| IEEE C37.04 | 2018 (Cor 1-2021; Amd C37.04a-2025) | Ratings and requirements for ac high-voltage circuit breakers with rated maximum voltage above 1000 V, from 4.76 kV through 800 kV, including preferred ratings. | Circuit breakers, MV metal-clad | The 2018 edition absorbed the preferred-ratings tables formerly published in C37.06. Amendment C37.04a-2025 changes construction requirements and clarifies related required capabilities. No active revision project. | ● Verified |
| IEEE C37.06 | 2009 (superseded by C37.04-2018) | Preferred ratings and related required capabilities for ac high-voltage circuit breakers rated above 1000 V; content now carried in IEEE C37.04. | Circuit breakers | No longer a standalone active standard. Cite C37.04-2018 for preferred ratings. C37.06.1-2017 (definite-purpose breakers for fast transient recovery voltage rise times) remains a separate document. | ● Verified |
| IEEE C37.09 | 2018 (Cor 1-2021; Amd C37.09a-2025) | Test procedures for ac high-voltage circuit breakers with rated maximum voltage above 1000 V, verifying ratings, dielectric, short-circuit and mechanical endurance performance. | Circuit breakers | Amendment C37.09a-2025 modifies test procedures. Excludes generator circuit breakers. No active revision project. | ● Verified |
| IEEE C37.90 | 2005 (R2011) — Inactive-Reserved | Service conditions, electrical and thermal ratings, and test requirements for relays and relay systems used to protect and control electric power apparatus. | Protection & relays | Inactive-Reserved since 2022-03-24. Revision PC37.90 (retitled to include control devices) is in development under a PAR approved 2020-12-03. Companion standards C37.90.1-2024 (surge withstand and electrical fast transient) and C37.90.2-2024 (radiated EMI) are active. Many relay datasheets still reference the 2005 edition. | ● Verified |
| IEEE 1584 | 2018 | Guide for performing arc-flash hazard calculations, providing incident-energy and arc-flash-boundary models for three-phase ac systems from 208 V to 15 kV. | Arc flash & safety, Protection & relays | Revision project P1584 has an active PAR; no new edition published as of September 2026. Companions: IEEE 1584.1-2022 (arc-flash study specification guidance) and IEEE 1584.2-2025 (data collection checklists, 1000 V and below). Errata available. | ● Verified |
| IEEE 1686 | 2022 (Cor 1-2025) | Cybersecurity capabilities to be provided in intelligent electronic devices, covering access control, audit trail, configuration, firmware and communications interfaces. | Cybersecurity, Protection & relays | Supersedes 1686-2013. Published 2023-02-01. Corrigendum 1 issued 2025. No active revision project. | ● Verified |
| UL 891 | 12th Ed. (2019), rev. 2025-03-21 | Deadfront switchboards rated 1000 V or less intended for use in accordance with the NEC, the Canadian Electrical Code Part I and NOM-001-SEDE. | LV switchboards | Trinational standard harmonized with CSA C22.2 No. 244 and NMX-J-118. Continuous maintenance: nine CSDS proposals in progress (latest dated 2026-07-10). | ● Verified |
| UL 1558 | 6th Ed. (2016), rev. 2019-11-06 | Metal-enclosed low-voltage power circuit breaker switchgear assemblies rated 1000 V ac nominal (1058 V maximum) for ordinary locations. | LV power switchgear | Product safety companion to IEEE C37.20.1. CSDS proposals in progress (latest 2025-01-31). | ● Verified |
| UL 1066 | 5th Ed. (2022) | Power circuit breakers up to 1000 V ac and 1500 V dc used in enclosures, stationary or drawout, fused or unfused; excludes molded-case circuit breakers. | Circuit breakers, LV power switchgear | Published 2022-08-08. Title changed in the 5th edition from Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures. Product safety companion to IEEE C37.13. | ● Verified |
| UL 489 | 14th Ed. (2025) | Molded-case circuit breakers, molded-case switches and circuit-breaker enclosures rated 1000 V ac or 1500 V dc or less and 6000 A or less. | Circuit breakers, LV switchboards | Published 2025-03-07. Editions 8 through 13 archived. Certification Requirement Decisions issued 2025-06-16, 2025-10-29 and 2026-02-27. | ● Verified |
| UL 1008 | 9th Ed. (2022), rev. 2026-08-25 | Transfer switch equipment rated 1000 V or less, including automatic, manual, closed-transition, hybrid, bypass-isolation and fire-pump transfer switches. | Transfer switches | Revision published and ANSI approved 2026-08-25. CSDS proposals in progress (2025-05 through 2026-05). | ● Verified |
| UL 508A | 3rd Ed. (2018), rev. 2025-06-26 | Industrial control panels operating at 1000 V or less for ordinary locations; excludes motor control centers, fire pump controllers and hazardous-location equipment. | Control panels | CSDS proposals in progress (latest 2025-12-01); no 4th edition announced. | ● Verified |
| UL 347 | 7th Ed. (2020), rev. 2025-02-03 | Medium-voltage ac contactors rated 1501 V to 15 kV, metal-enclosed contactor-based controllers and control centers, including fire-pump and service-entrance provisions. | MV metal-enclosed, Control panels | Trinational with CSA C22.2 No. 253 and NMX-J-564/106. Eight CSDS proposals in progress (latest 2026-04-17). | ● Verified |
| NFPA 70 (NEC) | 2026 | National Electrical Code: installation requirements for electrical conductors, equipment and raceways, adopted with amendments by state and local jurisdictions. | Codes | 2026 edition published; TIA 26-1 to the 2026 edition issued 2025-04-10. Adoption dates vary by jurisdiction and many states remain on the 2020 or 2023 edition. Next edition 2029. | ● Verified |
| NFPA 70E | 2027 | Standard for electrical safety in the workplace: safe work practices, shock and arc-flash risk assessment, PPE selection and establishing an electrically safe work condition. | Codes, Arc flash & safety | 2027 edition issued in 2026 and listed by the ANSI webstore as the most recent edition, revising NFPA 70E-2024. Medium confidence: nfpa.org is not machine-readable, so confirm Standards Council issuance and effective dates before quoting them. | ● Verified |
| NFPA 70B | 2026 | Standard for electrical equipment maintenance: electrical maintenance program requirements, condition-based maintenance intervals and equipment-specific maintenance tasks. | Codes | Revises the 2023 edition, which was the first issued as an enforceable standard rather than a recommended practice. Published January 2026 per bibliographic records. Medium confidence: confirm effective date on nfpa.org before quoting it. | ● Verified |
| NEMA PB 2 | 2011 | Deadfront distribution switchboards rated 600 V or less and 6000 A or less, covering the enclosure, circuit breakers, switches, metering and interconnections. | LV switchboards | Listed as the current active edition by the ANSI webstore, GlobalSpec and Accuris; nema.org could not be read directly (Medium confidence). Companion ANSI/NEMA PB 2.1-2023 covers handling, installation, operation and maintenance of deadfront switchboards rated 1000 V or less. | ● Verified |
| NEMA SG series (SG 5 / SG 10) | — | SG 5 covered power switchgear assemblies (inactive); SG 10 is a guide to OSHA and NFPA 70E safety regulations when servicing and maintaining medium-voltage switchgear and circuit breakers. | MV metal-clad, MV metal-enclosed, Arc flash & safety | UNVERIFIED — confirm before publishing. NEMA SG 5-1995 is listed as inactive; NEMA product standards for LV/MV switchgear assemblies have been superseded in practice by IEEE C37.20.x and must not be cited as current design standards. SG 10-2013 is the last known edition, confirmed only through a 2016 IAEI article; current status not confirmed on nema.org. | ▲ Unverified — confirm |
| ISA/IEC 62443 series | Multi-part series (key parts 2013–2025) | Requirements and processes for implementing and maintaining electronically secure industrial automation and control systems, addressing asset owners, service providers, integrators and product suppliers. | Cybersecurity, Control panels, Protection & relays | ISA-published parts per isa.org: ISA-62443-1-1-2007 (terminology and models), ANSI/ISA-62443-2-1-2024 (asset owner security program; IEC Ed. 2.0 published 2024-08), ISA-TR62443-2-2-2025 (security protection scheme), ISA-TR62443-2-3-2015 (patch management), ANSI/ISA-62443-2-4-2018 (service provider requirements), ANSI/ISA-62443-3-2-2020 (risk assessment and zones/conduits), ANSI/ISA-62443-3-3-2013 (system security requirements and security levels), ANSI/ISA-62443-4-1-2018 (secure product development lifecycle), ANSI/ISA-62443-4-2-2018 (component technical requirements; IEC 62443-4-2:2019). Several IEC parts are under revision. | ● Verified |
| IEC 62271-200 | Ed. 3.0 (2021) + AMD1:2024 (consolidated Ed. 3.1) | AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV, indoor and outdoor, including internal arc classification, loss of service continuity categories and partition class. | MV metal-clad, MV metal-enclosed | Edition 3.0 published 2021-05-27, Amendment 1 published 2024-06-27; stability date 2031. Replaces the 2011 edition and aligns clause numbering with IEC 62271-1:2017. Used for IEC-market and some export projects; not a substitute for IEEE C37.20.2 or C37.20.3 in ANSI-market specifications. | ● Verified |
Verification date: September 7, 2026. Method and sources are recorded in the project's standards register document. Questions about which edition a specification should cite belong with the engineer of record; we are glad to discuss.
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