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If This Is For Say A House Or A Distrubition Center, I Would Use 000 Which Will Handle Around 240 Amps With No Problem. I`m Sure This Will Handle It. At Anyone Time You Would Or Should Never Have The Loadcenter Maxed Out ( If This Is For A Home ) And If You Fill You Might Or Are Only Running One Item On This Wiring At 250Amp, You Will Have To Install 0000 Cable. Hope This Helps

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18y ago
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5mo ago

To carry 250 amps safely, a wire with a minimum gauge of 1/0 (pronounced "one-ought") or larger is typically recommended. It's important to consult local electrical codes and standards to ensure compliance and safety. Additionally, factors such as distance, insulation type, and ambient temperature should also be considered when sizing the wire.

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13y ago

CEC Table 2 and 4

A 250 MCM copper wire is with an insulation factor of 75 and 90 degrees C is rated at 255 and 265 amps respectively.

A 350 MCM aluminum wire is with an insulation factor of 75 and 90 degrees C is rated at 250 and 260 amps respectively.

4/0 copper or 300 Aluminum unless you run into voltage drop

Nec 310.15(B)(6)

250 MCM copper is good for 300 amps

350 MCM AL is good for 300 amps

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Q: How big a wire for 250 amps?
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What size wire for 250 amps?

15mm approx.


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