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Wire size for 30 amps

Copper #10
Aluminum #8

Wire size for 60 amps

Copper #6
Aluminum #4

Wire size for 100 amps

Copper #4
Aluminum #2

Wire size for 125 amps

Copper #2
Aluminum #1/0

Wire size for 150 amps

Copper #1/0
Aluminum #2/0

Wire size for 200 amps

Copper #2/0
Aluminum #4/0

Maximum Amperage for #14 gauge wire

Copper 15 amps
Aluminum (n/a)

Maximum Amperage for #12 gauge wire

Copper 20 amps
Aluminum 15 amps

Maximum Amperage for #10 gauge wire

Copper 30 amps
Aluminum 25 amps

Maximum Amperage for #8 gauge wire

Copper 40 amps
Aluminum 30 amps

Maximum Amperage for #6 gauge wire

Copper 60 amps
Aluminum 35-40 amps

Maximum Amperage for #4 gauge wire

Copper 70 amps
Aluminum 45-50 amps

Maximum Amperage for #3 gauge wire

Copper 80 amps
Aluminum 60 amps

Maximum Amperage for #2 gauge wire

Copper 90 amps
Aluminum 70 amps

Maximum Amperage for #1 gauge wire

Copper 110 amps
Aluminum 80 amps

No more than ___ of a wood shingle should be exposed?

1/3

Clay tile roof should have how much overlap?

3"

How far apart should wood shakes/shingles be placed?

3/8"

How much overlap is required on a asphalt shingle valley?

12"

Can 3 tab asphalt shingles be installed on a 2/12" pitch roof?

Yes, but only if there is two layers of felt paper.

A built up roof with a 12" lap joint is hoy many ply?

3 ply

Typical slope for waste plumbing?

1/4" per ft

Copper-to-steel connections undergo a ____?

Electrolytic reaction

What two locations is a check valve typically installed to prevent sewer backup into the basement?

Floor drains &
Main drain line

What is the minimum diameter and extension height above the roof line of event pipe to prevent frost /snow closure?

3" diameter &
6" above snow line

What is a wet vent?

A vent that also serves as a drain.

Temperature /pressure relief valve's are typically rated at?

150 psi
210 *F

What is the maximum length of a flexible gas appliance connector?

6 ft

In addition to a di-electric coupler, copper and galvanized steel can be joined by a brass converter fitting?

True

Two 3 ft appliance connectors can be connected to make a 6 ft connection?

False

Plumbing vents must terminate at least ___???

10 ft from a window &
6" above the roof

What determines the amount of electricity (amperage) a wire can carry?

Size (diameter)

How is the electrical system in most older homes grounded?

Water supply piping

What is the biggest improvement between knob-and-tube wiring and modern cable?

The use of grounding

It is okay to have a non-grounded receptacle within 6 inches of water?

False, all receptacles around water should be GFCI protected!

Maximum number of disconnects to shut off on the main panel is?

6

What are the three requirements for subpanels

...

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