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Temporary Power Plan Guide

How to read temporary power plans for construction sites, including source location, distribution, grounding, GFCI protection, lighting, and phasing.

Technical Guide

Temporary power plans show how a construction site will be powered before the permanent electrical system is available. They may include utility service, generators, temporary panels, distribution boards, receptacle locations, lighting, cords, feeder routes, and shutdown sequencing.

OSHA requires construction-site ground-fault protection for many temporary receptacles, either through GFCI protection or an assured equipment grounding conductor program. The plan reviewer should confirm that the drawings and specifications identify the protection strategy clearly before the site is energized.

What to Check First

Start with the source. Identify whether power comes from a temporary utility service, a generator, or an early connection to permanent gear. Then follow the distribution path from source to panels, branch circuits, lighting, hoists, trailers, pumps, and temporary equipment.

  • Temporary service size and location.
  • Generator location, fuel access, exhaust clearance, and noise constraints.
  • Panel, transformer, and disconnect locations.
  • Feeder routes protected from traffic, water, and demolition.
  • Temporary lighting coverage for stairs, corridors, work areas, and egress.
  • GFCI or assured grounding program requirements.

Coordination Risks

Temporary power is not only an electrical issue. The plan has to coordinate with logistics, phasing, safety, demolition, weather protection, and permanent equipment startup. If temporary feeders cross haul roads or if panels are installed in areas scheduled for demolition, the plan will fail quickly.

Helonic can help teams compare temporary utility assumptions with the broader drawing set, especially on phased projects where work areas change week by week.

Frequently Asked Questions

What ground-fault protection does a construction site require?
OSHA 1926.404 requires either GFCI protection on temporary receptacles or an assured equipment grounding conductor program, and NEC Article 590 governs temporary wiring. The drawings and specs should state which strategy applies before the site is energized. Leaving it unstated is a common review gap.
Where should temporary power review start?
Start at the source: confirm whether power comes from a temporary utility service, a generator, or an early tap of permanent gear, then follow distribution to panels, branch circuits, lighting, hoists, and equipment. The source determines sizing, grounding, and shutdown. Tracing the full path catches undersized feeders and missing disconnects.
Why is temporary power more than an electrical issue?
The plan has to coordinate with logistics, phasing, safety, demolition, and permanent equipment startup, so feeders cannot cross haul roads unprotected and panels cannot sit in areas scheduled for demolition. A feeder route that ignores phasing fails as the site changes. Comparing it to the logistics and phasing drawings catches these.
What temporary lighting should the plan show?
Coverage for stairs, corridors, work areas, and egress paths, since these are safety requirements during construction. Lighting drawn only for open work areas often leaves stairs and egress dark. The review should confirm egress and circulation lighting, not just task lighting.
Why do phased projects need extra temporary power review?
On phased work the active areas move week by week, so a panel or feeder that was fine in one phase can end up in a demolition zone or blocked access in the next. Temporary power has to track the phasing sequence. Comparing the power plan to the phasing drawings keeps distribution valid through each phase.
MG

Manas Gandhi

Co-founder & CTO, Helonic

Manas is the co-founder and CTO of Helonic, where he leads engineering and AI research for construction drawing analysis. He works directly with structural, MEP, civil, and fire protection engineers to translate the way they review drawings into AI systems that flag the issues that actually matter in the field. Before Helonic, he built machine learning pipelines for technical document understanding and has spent the last several years interviewing licensed design engineers and discipline leads to ground product decisions in real practice rather than industry assumptions.

Areas of focus
  • AI for technical document understanding
  • Cross-discipline coordination workflows
  • Code compliance automation (IBC, NEC, NFPA, IPC, IMC, ASCE)
  • Structural and MEP drawing review systems

How this page was researched: Temporary power review points were checked against NFPA 70 (NEC) Article 590 for temporary installations and OSHA 1926.404 for ground-fault protection on construction sites. Examples reflect the conflicts Helonic most often flags when comparing temporary power assumptions with logistics, phasing, and permanent electrical drawings.

Last reviewed by Manas Gandhi · May 2026

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