NEC 700: Emergency Systems
What This Article Covers
NEC Article 700 covers emergency systems — electrical systems essential for safety to human life that are required by law and classified as emergency by the AHJ.
Key Requirements
- Emergency power must be available within 10 seconds of utility loss
- Wiring kept independent of all other wiring
- Generator or other approved emergency source required
- Transfer equipment must be automatic and listed
- Required signage and identification
Common Field Applications
- Hospital emergency power
- Egress lighting in commercial buildings
- Fire alarm and exit sign power
Common Mistakes & Inspection Failures
- Sharing emergency circuit raceways with normal wiring
- Manual transfer where automatic is required
- Insufficient battery backup time
Related NEC Articles
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What does NEC 700 cover?
NEC Article 700 covers emergency systems — electrical systems essential for safety to human life that are required by law and classified as emergency by the AHJ.
What are the key requirements of NEC 700?
Key requirements include: Emergency power must be available within 10 seconds of utility loss; Wiring kept independent of all other wiring; Generator or other approved emergency source required. See the full requirements list on this page.
What are common mistakes with NEC 700?
Sharing emergency circuit raceways with normal wiring Manual transfer where automatic is required Insufficient battery backup time
Related Resources
Michael B.
IBEW Local 134 Journeyman Electrician · Licensed Electrical Contractor
Michael is an IBEW Local 134 journeyman and licensed electrical contractor. He teaches federal pre-apprenticeship on the south side of Chicago, helping students get into the IBEW. He built this practice test because he knows exactly what the NJATC aptitude exam tests — and what trips people up. If you prep with this, you walk in ready.