Emergency & Standby Systems Flashcards

NEC 700.3 requires emergency systems to be tested under load at what minimum frequency?

Answer: Monthly for 30 minutes

NEC 700.3(B) requires emergency systems to be tested under load conditions at least monthly for a minimum of 30 minutes.

Which of the following loads is classified as an emergency system load under NEC Article 700?

Answer: Exit signs and egress lighting

Exit signs and egress lighting are classic life-safety loads assigned to the emergency system under NEC Article 700.

What is the maximum allowable voltage drop on emergency system branch circuits under NEC 700.10?

Answer: No specific limit is stated

NEC Article 700 does not specify a maximum voltage drop for emergency circuits, though good practice and NFPA 110 recommend limiting drop to ensure reliable operation.

An optional standby system is covered by which NEC article?

Answer: Article 702

NEC Article 702 covers optional standby systems, which protect private business operations but are not required by law for life safety.

A sign reading 'EMERGENCY CIRCUIT' or similar must be posted at:

Answer: The emergency panelboard and all boxes containing emergency wiring

NEC 700.10(A) requires a permanent sign at each box, enclosure, or panelboard containing emergency wiring to identify it as an emergency circuit.

When a generator serves both emergency and legally required standby loads, the two systems must:

Answer: Have separate transfer switches unless the generator has sufficient capacity

NEC 700.12 and 701.12 allow one generator to serve both systems if it has adequate capacity and separate transfer switches are provided for each system.

Under NFPA 110, a Level 1 emergency power supply system (EPSS) is used when failure of equipment would result in:

Answer: Loss of human life or serious injuries

NFPA 110 Level 1 applies where failure of the EPSS could cause loss of human life or serious injuries to patients or occupants.