Practice test

Electrician Practice Exam 3

Free electrician practice test 3 with 25 foundation questions on bonding, dwelling load calcs, and NEC wiring rules. Detailed explanations follow every answer.

These questions are for study practice only and are not official exam questions.

Question 1

A separately derived system, such as the secondary of a transformer, requires a system bonding jumper to:

Question 2

For a 200-ampere service with 3/0 copper conductors, how are the grounding electrode conductors to a rod and to a Ufer sized?

Question 3

A main bonding jumper or supply-side bonding jumper is sized using:

Question 4

Interior metal water piping likely to become energized must be bonded even when the piping is:

Question 5

If circuit conductors are increased in size for voltage drop, the equipment grounding conductor must be:

Question 6

Bonding around a water meter or other removable equipment in the metal water piping is required so that:

Question 7

System grounding (connecting the electrical system to earth) serves to:

Question 8

Where a metal underground water pipe is used as a grounding electrode, the GEC connection must be made within how far of the pipe's entrance to the building?

Question 9

A 7,500-watt, 240-volt electric range nameplate draws what current at full load?

Question 10

Using Table 220.55, a single 12-kW household electric range is calculated at a demand load of:

Question 11

A dwelling has 2,400 sq ft of living area. The general lighting load before demand factors is:

Question 12

Applying Table 220.42, what is the general lighting demand for a dwelling whose general + small-appliance + laundry load totals 12,000 VA?

Question 13

A household electric clothes dryer is calculated at a minimum of which value using the standard method?

Question 14

The neutral (grounded) feeder load for a range or dryer may be calculated at what percentage of the ungrounded load under NEC 220.61?

Question 15

Total resistance of two 10-ohm resistors in parallel is:

Question 16

A feeder supplies a continuous load of 40 A and a noncontinuous load of 30 A. The minimum conductor ampacity (before adjustment) is:

Question 17

GFCI protection is required for 125-volt receptacles in all of the following dwelling locations EXCEPT:

Question 18

Type NM cable run through a bored hole in a wood stud must be set back from the edge of the framing at least:

Question 19

Receptacles in a dwelling must be placed so no point along the floor line of a wall is more than how far from a receptacle?

Question 20

Which set lists standard overcurrent device ratings below 50 A?

Question 21

Any kitchen countertop space this wide or wider must have a receptacle:

Question 22

Where a single receptacle is installed on an individual branch circuit, its ampere rating must be:

Question 23

The minimum headroom of working space about service equipment and panelboards is generally:

Question 24

Flexible cords (extension cords) may NOT be used as a substitute for:

Question 25

Type NM cable must generally be secured within how far of a box without cable clamps?

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