NC2 REVIEW SET B-1

These are sheet metal troughs with hinged or removable covers for housing and protecting electrical wires and cables and in which conductors are laid in place.

• bus ways

• wire ways

• cable ducts

• cable trays

Most of the required electrical parameters applied to an incandescent bulb

• Rated power and rated voltage

• Rated resistance and rated current

• Rated current and rated voltage

• Rated power and rated current

When tightening a terminal screw connection, the end of the wire should pass the screw in the same direction as the is turned so that,

• The wire will act as locknut

• Any pull on the wire will tighten the screw

• The wire will not turn off

•  The screw can be removed more easily

A part providing an appropriate degree protection of equipment against contains external influences and defined degree of protection against contacts with live parts in any direction.

• cabinet

• enclosure

• panel board

• switch gear

Locknut, bushing and connectors are called electrical ________.

• Conduit

• Fitting

• Expander

• tightener

Why is it necessary to use torque wrench in tightening bolted joints of bus bars inside wire ways?

• To prevent heating of the joints

• To reduce the resistance in the joint

• To make sure the joints are well tightened

• To give both  the allowance for thermal expansion

What is the commonly used conduit in service entrance?

• PVC

•  EMT

• RSC/IMC

• Flex conduit

What is the type of fitting commonly used for exposed conduit support?

• Conduit strap/clamp

• Condulet

• Connector

• Locknut and bushing

When raceways are exposed to widely different temperatures, it should be ____.

• Sealed

• Bonded

• Grounded

• Isolated

Before adding to or altering wet installation you must insure that ____.

• You are familiar with the existing installation

• Such work will not impair any part of the existing installation

• Safety precautions are followed

• All of the above