Is it ok to use a cord rated lower in amps than the cord that came with the thermaltake psu

Balloons

Reputable
Mar 29, 2014
2
0
4,510
i have a thermaltake 500w psu and the plug that came with it is rated 16A 250V but its a EU plug and i live in india so when i connect it to the wall socket the earthing doesnt work so instead i use a old power cord for that psu but its rated 6A 250V so am i not letting my psu run with its full power?
 
Solution
Generally it is not ok. I'm not electrician, but that rating is there for reason.
If you use lower rated cable it doesn't mean that it will supply less power, but that your device will try pull for example 10A through cable rated for 6A, which can cause overheating and possible melting or fire.

But to your specific case. If you use 500W PSU it should draw certain max power from outlet.
Equation is simple A x V = W that mean W/V = A

Or in your case 500W/250V = 2A.

This greatly depends on actual voltage and actual power drawn from outlet (as this may be higher or lower than rated power of PSU). But even if you would draw 700W / 220V = 3,18A
So that 6A cable should be able to handle it without problem.

But for better safety I would...

pm4

Honorable
Apr 28, 2014
421
2
11,160
Generally it is not ok. I'm not electrician, but that rating is there for reason.
If you use lower rated cable it doesn't mean that it will supply less power, but that your device will try pull for example 10A through cable rated for 6A, which can cause overheating and possible melting or fire.

But to your specific case. If you use 500W PSU it should draw certain max power from outlet.
Equation is simple A x V = W that mean W/V = A

Or in your case 500W/250V = 2A.

This greatly depends on actual voltage and actual power drawn from outlet (as this may be higher or lower than rated power of PSU). But even if you would draw 700W / 220V = 3,18A
So that 6A cable should be able to handle it without problem.

But for better safety I would rather have cable with higher overhead for possible spikes or if your PSU decide to go crazy and draw way more power. :)

 
Solution

AniChatt

Distinguished
Agree with pm4 but a PSU say it is at least +80 Bronze certified, then it may draw 625W for its rated 500W capacity say at 80% efficiency band. Even then it is not required to use a more than 3 Amps. So as long as it is a good quality cable you don't need to think of it. Even the PSU tries to draw more than 6 amp, it will reach it's failure (in terms of wattage) point before it can go any further.

I mean when the psu is claiming more than 6 amp from socket, for Indian ac current standard it will be 220volt. Then the PSU has to draw 1320 Watt from socket and it is supplying 1056 Watt to the components. It is totally impossible.