# Compliance evidence pack (UNOFFICIAL)

- **Question:** UFC 3-550-01
- **Generated:** 2026-07-22 16:43 UTC
- **e-Publishing catalog checked:** 2026-07-12
- **Supplement layer:** none selected
- **Source:** CheckMyAFI (https://checkmyafi.com) — unofficial reference

> **UNOFFICIAL — VERIFY BEFORE CITING.** Quotes come from indexed copies of public publications. The certified PDF on e-Publishing is the only authoritative source. Your MAJCOM/unit supplement may be stricter.

## Synthesized answer (unofficial)

UFC 3-550-01 was cancelled effective 1 September 2016 [UFC 3-550-01]. 

Change 3, dated 01 November 2019, documents this cancellation [UFC 3-550-01]. The document provided design guidance for exterior electrical power distribution systems, including requirements for conduit installation, grounding and bonding, and ductbank transitions [UFC 3-550-01].

However, UFC 3-550-01 remains referenced in current Air Force criteria for exterior power distribution design. Other UFCs such as UFC 3-501-01, UFC 3-520-01, UFC 3-530-01, and UFC 3-560-01 address related electrical system requirements [AFSOCI 32-1084 para 7.4.37; UFC 3-130-04]. Grounding and bonding systems must meet NFPA 70 (60 Hz) or BS 7671 (50 Hz) standards in conjunction with UFC 3-550-01 requirements [UFS 1-201-02].

For current design requirements, consult the superseding documents and applicable electrical codes referenced in active Air Force criteria.

Unofficial — answered from indexed publication text, which may be incomplete or out of date. Your MAJCOM/unit supplement may be stricter. Verify the official PDF before acting or writing a finding.

## Controlling Air Force guidance (quoted)

**AFSOCI 32-1084 para 7.4.37** (effective/current as of 2023-02-21)

> tant drains. Applicable criteria include UFC 3-401-01 for mechanical & UFC 3-410-01 for HVAC. Electrical Industrial equipment typically requires 240- and 480-volt, three-phase electrical current. Use commercial grade convenience receptacles and special power outlets. Consult X-ray and other NDI equipment specifications for their specific power requirements. Applicable criteria include UFC 3-501-01 for general electrical requirements, UFC 3-520-01 for interior electrical systems requirements, UFC 3-530-01 for interior and exterior lighting and controls requirements, UFC 3-550-01 for exterior power distribution systems requirements, UFC 3-560-01 for electrical safety and electrical O&M requirements, UFC 3-580-01 for building telecommunications requirements, and UFC 4-021-01 for mass notifica

Official source: https://static.e-publishing.af.mil/production/1/afsoc/publication/afsoci32-1084/afsoci32-1084.pdf

## Supplement deltas

_No supplement passage retrieved — check the supplement chain before citing._

## Federal / DoD standards implemented (quoted)

_No federal/DoD passage retrieved._

## NFPA standards (cited by reference — copyrighted, not quoted)

- **NFPA 780** Installation of Lightning Protection Systems — cited by AFSOCI 32-1084 — official viewer: https://link.nfpa.org/free-access/publications/780/latest
- **NFPA 33**  — cited by AFSOCI 32-1084 — official viewer: https://link.nfpa.org/free-access/publications/33/latest

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Retrieval confidence: 97.0 · CheckMyAFI is not an official Air Force product. Verify every citation against the certified publication.