Lesson Assessment #20

Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 1,000V phase-to-phase for each individual device used as a building or structure main disconnecting means rated _____ or more, unless specifically exempted.

1,000 A

"_____" is a term indicating that there is an intentional delay in the tripping action of the circuit breaker, which decreases as the magnitude of the current increases.

Inverse time

A "raceway" is an enclosed channel designed expressly for the holding of wires, cables, or busbars, with additional functions as permitted in the Code.

True

NFPA 70E - Standard for Electrical Safety in the Workplace, provides information to help determine the electrical safety training requirements expected of a qualified person.

True

Single-pole breakers with identified handle ties can be used to protect each ungrounded conductor for line-to-line connected loads.

True

An arc-fault circuit interrupter is a device intended to de-energize the circuit when a(n) _____ is detected.

arc fault

Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the tap conductors _____.

are suitably protected from physical damage terminate at a single circuit breaker or a single set of fuses that limits the load to the ampacity of the conductors

Overcurrent devices are not permitted to be located in the bathrooms of _____.

dwelling units Answered dormitories guest rooms or guest suites of hotels or motels

The conductors used to connect the surge protective device to the line or bus and to ground shall not be any longer than _____ and shall avoid unnecessary bends.

necessary

The selection and installation of overcurrent protective devices so that an overcurrent condition will be localized to restrict outages to the circuit or equipment affected, is called "_____."

selective coordination