Electrical Flashcards
How many wire are there from the street into a house In a 240 volt system?
Three wires
What determines the amount of electricity ( amperage) a wire can carry ?
Size( diameter)
The size of the fuses or breakers at the main disconnect will always tell you how much electricity is available to the house ?T/F
False
What Size service wire (minimum ) would be required to provide a house with 60 amp service ?
6 Cu
How is the electrical system in most older homes grounded?
Water supply piping
The ground wire should always be clamped upstream of the water Meter? T/F
True
How are the electrical systems grounded in rural properties where the well supply piping into the house is plastic?
Ground rods
Metal well casing
Breakers are safer than fuses . Any house with fuses should be upgraded to breakers. T/F
False
Fuses are more prone to be improperly sized and overloaded.
T/F
True
What is/are the most common reason for replacement of knob-and- tube wiring ?
- Breakdown of the cloth covering(insulation)
- buried in thermal insulation
- homeowner splices and repairs
Name an important improvement between knob-and-tube wiring and modern cable
Use of grounding
Where are GFCI’s required in newer houses ?
Kitchen counters
Bathrooms
Unfinished basements
Outdoors
In most cases,three distribution wires connected to one fuse or breaker is acceptable. T/F
False
What is the most common electrical flaw found residentially?
Over fusing
A non- grounded receptacle within 6” of water should be replaced with?
GFCI
GFCI upstream from receptacle
Single pole GFCI breaker