NCCER Electrical 2 Module 5

Which enclosure is suitable for use in Class 1 hazardous locations?

• Type 1

• Type 3

• Type 4

• Type 7

An enclosure installed in a dry residential basement would most likely be a NEMA ______.

• Type 1

• Type 3

• Type 7

• Type 9

The first number in the IP classification system designates the degree of protection against _______.

• air infiltration

• solid objects

• fire hazards

• water

When attaching metal conduit to an enclosure that contains a bonding jumper, the jumper can be connected to a ___.

• standard locknut

• plastic locknut

• grounding locknut

• plastic bushing

A Myers hub is best described as a(n) _____.

• gasketed fitting

• sealing locknut

• setscrew fitting

• insulated bushing

The minimum length of a pull box with one 2" conduit and two 1" conduits entering on one side of the box and exiting at a 90* angle on another side of the box is ________. (Assume the system is less than 1,000V.)

• 14"

• 16"

• 18"

• 24"

For a straight pull, the minimum length for a pull box with two 2" conduits and one 3" conduit is_________. (Assume the system is less than 1,000.)

• 24"

• 26"

• 32"

• 34"

For a pull box housing shielded conductors carrying over 1,000v the distance between a conductor entry and exit must be ___.

• 24 times greater than the OD of the conductor

• 30 times greater than the OD of the conductor

• 36 times greater than the OD of the conductor

• 45 times greater than the OD of the conductor

Boxes must be marked with the words "DANGER - HIGH VOLTAGE - KEEP OUT" if they house conductors over _____.

• 240V

• 480V

• 600V

• 1,000V

Which of the following conduit bodies has a cover opening on both sides ?

• Type LB

• Type LL

• Type LR

• Type LRL