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Old 1st March 2011, 04:36 PM   #1
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Default Safe to use 300v wire for much higher voltage?

I recently bought a spool multiconductor cable to make an umbilical cable between the PSU and amp. Problem is I only got a 300v rated one, meanwhile my PSU has 580vdc running through.
The cable has "AWM style 2343" printing on it and after googling around for a while, I got a datasheet saying that it's OK to use this cable at 600v peak.

What I'm still uncleared is whether the 300v is AC or DC rated?
Anyone trying using 300v cable for higher voltage?
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Old 1st March 2011, 06:10 PM   #2
Mooly is offline Mooly  United Kingdom
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If it's 300vdc rated it's not high enough for 580 vdc.
If it's 300vac rated then that equates to a peak voltage of 424volts. Again not high enough.

Maybe your cable is rated for 600vdc, maybe not, but if it were bought as 300vdc rated you have to assume that is it's rating unless you can prove beyond doubt otherwise.
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Old 1st March 2011, 06:53 PM   #3
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If it's this cable:- http://www.nationalwire.com/pdf/NW.pdf ...then it's rated 300 VRMS for appliance use. The Mil. Spec. is 1000VRMS, it's rated 600 VRMS for electronic use and the insulation breakdown voltage is: greater than 5000 volts AC RMS, 60cp. Electronic use AFAIK means in an enclosure inaccessible to touch.

Better safe than sorry. If I was buying cable for this application, I'd be looking for 600 VRMS appliance rated. How'd you feel if a child got a shock?

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Old 5th March 2011, 03:48 PM   #4
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Thanks.

Anyone knows a good source for multiconductor cable? Hard to find one that fits my need.
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