DC Conductor for 1000V system inside building

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csoc64

Senior Member
Location
northeast
I am looking for a solution for 1000V rated conductors for interior wire run applications. My typical go-to is 10/2 MC, but it appears that what I typically purchase is only rated THHN 600V. My understanding is that THWN-2 is 1000V DC rated but I am unsure if this comes in an MC version, as I have had no luck sourcing it. If I have to run flex/EMT using THWN-2, I am also struggling to find a source for the #10, other than PV wire, so I am wondering if that is my only solution. Any thoughts would be greatly appreciated.
 
THWN is rated for 600 volts only. Regardless if AC or DC. This is because it gets tested at the manufacturing factory for a 600V rating/listing. If you're needing 1000 volts there are other wires available but these go through higher testing voltages and will be listed as such. AWM 1452, PV and some RHW-2 wires will have voltage rating at or over 1000 volts. Then there are some highly specialized ones too but they are expensive. PV or 1000 volt RHW-2 are probably your best and most cost effective options though.
 
In AC systems its generally accepted to use wire right up to its voltage threshold,
for example 600V THHN is used for 600/347 wye systems,
I don't know much about DC, but for a nominal 1000/577V AC system you can use regular XHHW-2
so I can't think of any issue with a nominal 1000VDC system.
If its unregulated PV you might need PV wire as Ben suggested.
 
csoc64 said:
I am looking for a solution for 1000V rated conductors for interior wire run applications. My typical go-to is 10/2 MC, but it appears that what I typically purchase is only rated THHN 600V. My understanding is that THWN-2 is 1000V DC rated but I am unsure if this comes in an MC version, as I have had no luck sourcing it. If I have to run flex/EMT using THWN-2, I am also struggling to find a source for the #10, other than PV wire, so I am wondering if that is my only solution. Any thoughts would be greatly appreciated.
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you’re running into the normal limitation, most MC with THHN is only 600V so it won’t cover a 1000V DC PV run inside, THWN 2 can handle 1000V but yeah finding it prepackaged in MC is tough because it’s not how most systems are designed, typical approach is EMT or flex with individual THWN 2 conductors, or just go straight PV wire where allowed, also check if you can step up to 2kV PV wire, that stuff is easier to source now and solves a lot of headaches, MC-PV cable does exist but availability is spotty and pricey, so in practice most guys just run conduit with THWN 2 and call it a day
 
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