Journeyman Electrician's Emergency and Standby Systems Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Emergency and Standby Systems flashcards as text
According to NEC Article 700, emergency systems must supply power within how many seconds after loss of normal power?
Answer: 10 seconds
NEC 700.12 requires emergency systems to restore power within 10 seconds of normal power loss to protect life safety.
Which NEC article specifically governs Legally Required Standby Systems?
Answer: Article 701
NEC Article 701 covers Legally Required Standby Systems, which are mandated by government agencies for safety but are not immediate life-safety emergency loads.
What is the minimum battery operating duration required for unit equipment emergency lighting under NEC 700.12(F)?
Answer: 90 minutes
NEC 700.12(F) requires unit equipment to maintain adequate illumination for a minimum of 90 minutes from battery backup.
Emergency system wiring must remain entirely independent of all other wiring EXCEPT in which location?
Answer: Transfer equipment enclosures
NEC 700.10(B)(5) specifically allows emergency and normal wiring to share an enclosure only within transfer equipment, where connection of both systems is inherently necessary.
An automatic transfer switch (ATS) for emergency systems must be designed to:
Answer: Prevent interconnection of normal and emergency sources
NEC 700.5(A) requires transfer equipment to prevent the inadvertent interconnection of the normal and emergency power sources to avoid backfeed and equipment damage.
A generator used as an emergency source under NEC 700.12(B) must transfer the emergency load within:
Answer: 10 seconds
NEC 700.12(B) specifies that engine-driven generators must start and transfer the emergency load within 10 seconds of loss of normal power.
Which of the following loads is classified as an emergency system load under NEC Article 700?
Answer: Exit and egress lighting
Exit and egress lighting is a life-safety load covered by Article 700 to ensure safe building egress during a power outage.