Chapter 3 Wiring Methods And Materials Flashcards
The minimum distance on the edge of a stud must be from the edge of a hole for NM cable is?
1 1/4”
When the direct burial access the ground, what shall they be enclosed in?
Raceway
At what rated voltage does direct burial cable have to be shielded?
2,000 volts
What is the smallest Size conductor you can run in parallel?
1/0
What is the minimum size wire needed to supply hundred amp single phase 3 wire main service on a mobile home?
4
Family dwelling has 100 amp service. What size feeder will be required to supply 75 amp electric space heater and a 25 amp air conditioner?
2
75 x 125%=93.75
What is the minimum size THW conductor that can be used to supply is 20 amp single phase commercial building?
3/0 copper
What type of conductor is rated for a direct burial?
UF
When using a round box where conductors or connectors requiring the use of locknuts or bushings are to be connected, to what part of the box can they not be connected?
Side of the box
Nm cable shall be approved for installing under the lower edges of a Joist in crawlspaces if the wires are at least three ____AWG?
8 awg or 2 #6s
What is the required free space in a junction box for a number 10 conductor?
2.5 cubic inches
What is the maximum number 14 conductors in a 4 x 2 1/8” metal octagon trade size box?
10
Type NM cable Shall be secured how many inches from a non-metallic box if there is no clamp?
8 inches
A fixture box shall be independently supported if the fixture weighs more than how many pounds?
50 lbs
Floor boxes must be made of what??
UL listed
Maximum distance from a panel that a type MI cable shall be secured?
6 feet
What is the temperature rating for the conductor of type NM cable
60 C
What type of cable is not approved to be a SE cable?
UF
For gas stations ____ can be used as a raceway under class 1 division 1 under 8 inches of fill dirt.
RMC
10 feet of equipment grounding conductor cannot be made of what?
FMC
What is the maximum distance between supports of 1” rigid pvc?
3 feet
What is the expansion rate of 250 feet of pvc that goes from a temperature change of -20 F to 80 F?
10.15
Type RTRC shall be permitted to be unsupported where the raceway is not more than ____ long and remains in unbroken lengths and terminated in an outlet box?
3 feet
What is the maximum number of conductors allow in an auxiliary gutter?
30
