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Author Topic: IEC cord Rating for 1 Antminer S9 with APW3++ 220v 50hz  (Read 358 times)
iamrohitkgupta
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November 15, 2017, 07:07:17 AM
 #1

I have a 10 amp IEC cord connected to the PSU but it gets hot. I don't have an instrument to read the temperature.
Shouldn't 10 amps be enough at 200v?
Cable is thin though, 0.75 mm².
I don't see any darkening in the cable. Should i be worried?
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T-Gee05
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November 15, 2017, 07:39:24 AM
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For S9, the power consumption is 1323W (13.5TH/s batch).. say 1400W. At 220V supply, load current is 6.4A plus 10% at the wall for efficiency.. so around 7.1A.

Wire size should be 1.5mm2 as per NEC wire sizing for 7.1A load. That makes your wire undersize for your load if it is only 0.75mm2 that is why it gets hot.

Better get thicker wire size to match your load current and that is 1.5mm2 to be safe.

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November 15, 2017, 12:08:28 PM
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For S9, the power consumption is 1323W (13.5TH/s batch).. say 1400W. At 220V supply, load current is 6.4A plus 10% at the wall for efficiency.. so around 7.1A.

Wire size should be 1.5mm2 as per NEC wire sizing for 7.1A load. That makes your wire undersize for your load if it is only 0.75mm2 that is why it gets hot.

Better get thicker wire size to match your load current and that is 1.5mm2 to be safe.


Okay. Thanks. Im gonna search the local computer hardware store.
Can you give any brand recommendations? I live in India.
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November 16, 2017, 03:08:22 AM
 #4

For S9, the power consumption is 1323W (13.5TH/s batch).. say 1400W. At 220V supply, load current is 6.4A plus 10% at the wall for efficiency.. so around 7.1A.

Wire size should be 1.5mm2 as per NEC wire sizing for 7.1A load. That makes your wire undersize for your load if it is only 0.75mm2 that is why it gets hot.

Better get thicker wire size to match your load current and that is 1.5mm2 to be safe.


Okay. Thanks. Im gonna search the local computer hardware store.
Can you give any brand recommendations? I live in India.

Im not familiar with the brands you have there but it is similar to this specs

https://www.amazon.com/Omnigates-Power-14AWG-5-15P-Connector/dp/B01DS79UU2/ref=sr_1_16?s=electronics&ie=UTF8&qid=1510800963&sr=1-16&keywords=power+cord++250v+14awg+15a
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November 16, 2017, 03:45:57 AM
 #5

Given how very thin power cords are India, Asia, and many other countries best you can look at is the current (amps) rating.

Be very aware a cord's rating is the maximum amount of current that can be safely used FOR A SHORT PERIOD OF TIME not with a constant load. You never ever want to push a cord to max for long periods of time. As you have found out - they get hot.

For loads running 24x7 like miners preferably a cord should be rated for 2x what a miner draws.

Any cord powering miners like the s9 or Avalons need cords rated for at least 13 amps, 15 is better.

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iamrohitkgupta
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November 16, 2017, 09:05:59 PM
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Thank you, guys!
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