Advanced Wiring Test Prep Chapters 28,29, and 26 Flashcards
Name two types of smoke alarms.
Photo-electric type (photoelectronic)
and
Ionization
Which of the following statements is true?
a. Smoke alarms installed in new one- and two-family homes must be battery operated only.
b. Smoke alarms installed in new one- and two-family homes are to be dual-powered by a 120 volt circuit and a battery.
b. are to be dual-powered with 120 volt circuit and a battery
Which of the following statements is true?
a. Always install smoke and fire alarms in dead space.
b. Never install smoke and fire alarms in dead space.
b. never
What is the minimum size service for a one-family dwelling?
100 amperes
What is a Type S fuse?
a fuse type that is non-tamperable and non-interchangable
Where must Type S fuses be installed?
In all new installations
List the standard rating of fuses and circuit breakers up to and including 100 amperes.
Fuses:
1,3,6,10
Circuit breakers:
15,20,25,35,40,45,50,60,70,80,90,100
What is the maximum voltage permitted between conductors when using plug fuses?
125 volts or 150 volts in circuits having a grounded neutral
Are plug fuses (Type S) permitted to be installed in a switch that disconnects a 120/240-volt clothes dryer?
Yes.
Will a 20-ampere, Type S fuse fit properly into a 15 ampere adapter?
No.
Why are plug fuses (Type S) permitted to be installed in a switch that disconnects a 120/240-volt clothes dryer?
Because it’s less than 150 volts to ground.
A time-delay dual element fuse will hold 500% of its rating for approximately
(5 seconds)
(10 seconds)
(15 seconds)
10 seconds
What part of a circuit breaker causes the breaker to trip on an overload?
the bi-metallic element
What part of a circuit breaker causes the breaker to trip on a short circuit?
the magnetic coil
What is meant by an ambient-compensated circuit breaker?
a circuit breaker with 2 thermal elements. One heats up due to current passing through. The other senses if the air temperature is too hot or cold.
List 4 combinations of service equipment that meet code requirements
Fully Rated/Fused
Series Rated/Fused
Fully Rated/Circuit Breakers
Series Rated/Circuit Breakers
Define the Service Point.
The point of connection from the serving utility and the premises wiring.
Define service-drop conductors.
The overhead conductors between the serving utility and the Service Point.
The service head must be located (above) (below) the point where the service-drop conductors are spliced to the service entrance conductors.
(above)
How and where is the grounding electrode conductor attached to a water pipe?
With a ground pipe. The first 5 feet.
A surge protective device for the service is required to be of which of the following Types? Choose all answers that are correct)
a. Type 1
b. Type 2
c. Type 3
d. Type 4
a. Type 1
b. Type 2
What is the recommended height of a meter socket from the ground?
5 ft (eye level)
Is the bare grounded neutral permitted to buried directly in the ground?
Yes.
How far must mechanical protection be provided when underground service conductors are carried up a pole?
8 ft
A service disconnect is permitted to consist of not more than how many switches or circuit breakers?
6
Do the following grounding electrode conductors require mechanical protection?
a. 8 AWG
b. 6 AWG
c. 4 AWG
a. 8 AWG Yes.
b. 6 AWG Yes.
c. 4 AWG No.
Why is bonding service entrance equipment necessary?
Because service entrance conductors do not have over current protection at their line side, other than the utility’s primary transformer fuses.
When insulated conductors 4 AWG or larger that are required to be insulated are installed in conduit, what additional provision is required on the conduit ends?
Bondings/Bushings
