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Aug
125 amp 10. It is important to pick the correct size of wire so that the wire doesnt overheat.
Electrical current is measured in amps.
Wire size for 125 amp service. This is why its recommended to use a 175A and a bigger 125 amp wire size of 20. What about the temperature rating. To me theres no better reference for it than this table.
The wire you use determines the temperature rating you need to follow and the corresponding capacity recommendations. The wire size according to code has to be up sized to 125. 29167 x 125 3646.
500MCM copper wire with an insulation factor of 75 and 90 degrees C. Do I have to use a 125 amp disconnect or can it be less amperage. The disconnect has to be the same or larger amps as the main breaker panel.
You could install a 200A disconnect to terminate the 40 wire and continue on to the 125A main panel with 10. 125A is 1 copper or 10 aluminum you need to call it 120A feeder but you get to round up to 125A breaker since 120A is not made If you need full declared 125A youd need 20 aluminum. If you need full declared 125A youd need 20 aluminum.
Aluminum SE cable 10 meets code for residential single phase services and feeders up to 125-amp. You can find this in table 31015 b 6 in NEC. In reference to Jim Ports comment it is only rated 100-amp in table 310-16 under the 60 degree column for aluminum wire.
Electrical current is measured in amps. Each wire size or wire gauge AWG has a maximum current limit that a wire can handle before damage occurs. It is important to pick the correct size of wire so that the wire doesnt overheat.
The number of devices connected to the circuit usually determines how much current will flow through the wire. An often-used rule-of-thumb is to jump up one wire size for each 100 feet of a long run. SERVICE SIZE WIRE SIZE.
100 amp 2. 125 amp 10. 150 amp 20.
200 amp 40. 225 amp 250. The neutral wire is often one or two sizes smaller than the two hots.
Wire Sizes For 200 Amp Service. AWG American Wire Gauge is the US standard for sizing electrical wiring. Wiring 200 amp service requires either 20 copper wiring or 40 aluminum or aluminum clad wiring.
Which wire used is determined by the voltage drop and length of the wiring. The following table reflects wiring size length and voltage drop. The wire size for 125 amp service should be a 10-gauge bare ground wire.
How to wire a 125 amp service. Firstly ensure that the power is completely off for safety reasons by disconnecting the power leads from the meter. What size wire do i need for 125 amp service.
You need 125 Amp wire if you have a 125 Amp breaker. There is a table here. No one has made a 90 breaker yet so you need to use the 75 column.
Since this is a single phase dwelling service you can use 2 AWG copper or 10 aluminum. Assuming the service voltage is 240 volts. A 20 aluminum conductor with an insulation factor of 90 degrees C will limit the voltage drop to 2 or less when supplying 125 amps for 100 feet on a.
What size wire is needed for 125 amp service. For a 125 amp service the wire size should be 20. And the size of wire for 150 amp service should be 30.
How do I run electricity from pole to house. The three wires from the utility pole enter into a vertical conduit through a weatherhead. It routes them to the electric meter.
The minimum permitted conductor would be 10 Al with a 125 OCPD. At 90 amps of load your voltage drop would still be under the 3 recommended threshold. As Dennis stated if you wanted the full 125 amps then with the 3 maximum recommended VD you would need to go up to 20.
In the American Wire Gauge AWG system each gauge number corresponds to a particular cross-sectional diameter or area. For example 14-gauge wire has a cross-sectional diameter of 163 mm and a cross-sectional area of 208 mm 2 while 10-gauge wire has a diameter of 259 mm and an area of 526 mm 2. Since this is a single phase dwelling service you can use 2 AWG copper or 10 aluminum for a 125 amp service or main feeder.
What size is 100 amp wire. You need a 3-3-3-5 copper SER cable to carry 100 amps thats three 3 gauge for the two hot wires and the neutral and a. Notes to the table above.
Branch circuit wire sizes for long runs. The long-run wire sizes given in the table above are for typical residential branch circuits up to 50A. Service entry cable wire sizes for long runs.
Detailed tables of copper or aluminum Service Entry Wire SEC cable sizes for long runs at higher ampacities entering the buildings main electrical panel and where we give sizes. 4 approx 65-75A each used for 100-115 amp service 2 approx 90A each used for 125-150 amp service 10 approx 150A each used for 200 amp service 20 approx 175A each typically for industrial or vary long run with a large load. 300-350 amp service 03 approx 200A each typically for industrial or vary long run with a large load.
Select the type conductor wire material the circuit voltage and the phase of the circuit. Enter the total amperage on the circuit. Also enter one half of the total length of the circuit.
A sample of 120 volts single phase copper wire 144 feet one half of a 288 foot circuit with 10 amps load on it yields a number 10 awg wire size. Our calculator yields results that are within code in most locations. 125 amp sub panel.
Most likely I would choose 2 AWG copper. 2 AWG CU is rated 115 amp use 2404 B move up to next standard size OCP. Or if you want AL 10.
10 AL is rated 120 amp use 2404 B move up to next standard size OCP. I can not say what you need for a. If electrical service is delivered by overhead wires they will enter a metal service pipe that runs down an exterior wall of your home to the meter.
If the meter is a glass dome mounted on a square metal base the home probably has 100 amps of power while a newer 150-amp or larger service will have a rectangular base that extends below the glass dome. The minimum size service conduit shall be 1-14. The minimum size service entrance wire shall be rated 100 amperes minimum for single family dwellings.
For single family homes the service disconnect means shall have a rating of less than 100 amperes 3-wire.