IEC Electrical final exam study guide

Which THHN wire size labeled bellow has the highest resistance?

#6 copper

You timed your helper and it took him an hour and a half to dig a 10 foot trench. You get another helper who will work at the same pace. How much time will it take both workers to dig an additional 80 feet.

3 hours and 36 minuetes

Underground feeder cable in PVC under a building must be installed atleast ___________ inches deep.

0

A 10,000 square foot dwelling has a hallway that is 80 feet in length. The minimum number of recepticals required by the NEC in the hallway is __________

1

What is the minimum trade size ENT required to contain 3 1-0 AWGTHHN/THWN copper conductors?

1 1/4

If a 95 watt lamp operated for 11 hours, the utility bill will be ________ kWh.

1.045

find the minimum wire size to limit the voltage drop 5%. you will run 300 ft of type NM-B cable, to a 120 volt, 1/2 HP 8- amp load.

10

The minimum size service disconnect for a single family dwelling with a computed load of 10 KVA is _______ apms.

100

How many number 10 AWG conductors may be installed in a 4 11/16 x 2 1.8 square box that already contains six 12 AWG conductors?

11

Section __________ in the NEC provides clearances in front of electrical equipment.

110.26

Seven 1-0 AWGTHHN/THWN copper current carrying conductors are installed in a conduit. How much current in amps can each of these carry (corrected ampacity) where the conductor is installed in an area where the summer time temperature is 142 degrees ferenhiet.

119

The shortest bending radius for 12-2 type MC cable is _______ times the external diameter of the metal sheeth.

12

Two 10 AWG circuit conductors and a 10 AWG equipment grounding conductor that enter through one conduit and exit through another conduit can be spliced with wire nuts inside of an LB condulit if the LB is marked with a cubic inch capacity of at least _________ cubic inches.

12.5

A ________ amp circuit breaker is the largest that can be installed on a 12 AWG copper circuit conductor. The circuit is connected to several receptacles.

20

In a dwelling at least _____ ampere branch circuit must be provided for bathroom receptacles.

20

A ________ amp single hole snap switch is permitted to be used to control a lighting circuit that pulls 15 amps

20,15,30

How many complete pieces of cable 8 3/8 inches in length can be cut from a 15 foot length of cable?

21

the ampacity of a number 10 THHN/THWN copper wire in a conduit with 7 other current carrying conductors is how many amps

28 AMP

Where 12-2 type MC cable is run from a branch circuit the maximum spacing permitted between support clips or straps is _______ feet.

6

horizontal runs of trade size 3 schedule 40 PVC must be supported at what ft intervals

6 ft

a flush mounted well light is located in the corner of a sidewalk at a house. The side walk is 3 in thick and schedule 40 PVC will be installed for the power. this 20 amp, 120 v circuit is GFCI protected. in inches what is the min depth from top of conduit to top of sidewalk.

6 inches

what is the voltage drop on a 120 volt circuit? the circuit uses 12 awg copper conductors and has a load of 20 Amps. there is a resitace of 100 feet from the panel to the load (use K=12)

7.35 Volts

an electrical grounding conductor is permitted to be what color

Green

Which of the following is permitted to be connected to either or both of the two 20 amp small appliance circuits required for the kitchen and dinning room areas of a dwelling.

clock-outlet

The two 20 ampere small appliance branch circuits required for the kitchen and dinning room area are intended to supply _______ appliances.

counter-top

A luminaire installed under a covered breeze way would have to be marked as suitable for a ________ location.

damp

A ____________ switch will be used to break two underground circuit conductors such as to a motor.

double pole

A faliure of the electrical system can cause damage to __________

equipment, conductors, property

GFCI's operate by comparing the amount of current flowing in the _________ circuit conductors of a 240 volt circuit. When these are not the same, the GFCI device trips.

hot and hot

explanatory material is represented through the code using

informational note

The main service disconnect installed inside a building shall be installed so as to be rididly accessible and ___________ of where the service entrance conductors enter the building.

nearest the point of entrance

the rating of a branch circuit is determined by its

over-current protective device (fuse or current breaker)

If two identical 24 volt loads are to be operated from a single 24 volt battery, the loads will be connected in ________ to receive the correct voltage from the battery.

parallel

A underground conductor can be marked with _______________ tape.

pink

opposition to current flow is

resistance

a circuit installed in EMT between a 2 pole circuit breaker and a load. if the hots are touched together in a junction box somewhere in the pipe. run, this is what type of condition

short circuit

which of the following types of current travel through a circuit breaker

short circuit, ground fault, overload

Switching terminal screws on switches are always connected to the ________ conductor

ungrounded