Can a one meter 50mm2 cable handle 350 amperes?





Of course the measuring is approximate since the cable is flexed.

  • \$\begingroup\$ Continuously or for a short while? \$\endgroup\$
    – winny
    Feb 15 at 10:26
  • \$\begingroup\$ Well everything can handle 350A. The question is for how long it can \$\endgroup\$
    – Panthera
    Feb 15 at 14:07

1 Answer 1



Source: https://www.powerstream.com/Wire_Size.htm

Size 0 wire, area 53.5 mm2: "Maximum amps for power transmission" : 150 A or 245 A (depending on the application) which is less than 350 A.

  • 2
    \$\begingroup\$ The same table says "Maximum amps for chassis wiring" for #0 is 245A, so it clearly depends on how the wire is being used and probably also makes some assumptions about the insulation's temperature rating. \$\endgroup\$
    – brhans
    Jan 26 at 15:59
  • 4
    \$\begingroup\$ @user331438 Fundamental concept: length is irrelevant to current carrying rating (ampacity). Another fundamental concept: length affects voltage drop, not ampacity. \$\endgroup\$ Jan 26 at 16:29
  • 5
    \$\begingroup\$ @StainlessSteelRat "Impacts temperature". It impacts heat, not temperature. At a given current, the temperature is the same, regardless of length. Yes, a longer cable produces more heat, but it also dissipates more heat along a longer length. The two effect balance each other. The result is that the temperature is the same, regardless of length. It's simple thermal engineering. \$\endgroup\$ Jan 26 at 17:08
  • 3
    \$\begingroup\$ Not the downvote, but the OP is not concerned about power transmission but a one meter 50mm2 cable, which is a chassis wiring. \$\endgroup\$ Jan 26 at 19:34
  • 2
    \$\begingroup\$ This totally depends on application. This question is not answerable as written because application is not known. Inside a quadcopter is different than inside the walls of a structure. Duty cycle matters: Welder yes, EVSE hell no. Allowable thermal rating (on wires and application matter. 150°C wire inside walls hell no, inside equipment chassis probably. \$\endgroup\$ Jan 26 at 20:33

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.