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Old 11-18-2010, 10:29 PM   #1
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Spa wiring - NMWU or NMD890?


Hi,

I have installed a new spa pack and pump into our hot tub (inherited with our house a few years ago). I need to rewire a small length between the kill switch inside the enclosure to the spa pack control unit, asn the old length of wire is a bit too short. The old wire is AWG 10/3 CU NMWU 300V FT1, which is also what runs from the breaker (30 amp GFCI, 240 volt). The electrical guy at the big box store sold me NMD90 XLPE 10/3 300V FT1 instead, saying that it was a suitable substitute for the NMWU. Is he right?? The spa is outside, and I thought that NMD90 was only for indoor protected dry areas? Granted it is inside the enclosure, but I wouldn't exactly call that a dry location.

Any help would be appreciated!

PS - whoops, my thread title was wrong - I meant NMD90.

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Old 11-19-2010, 06:06 AM   #2
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Spa wiring - NMWU or NMD890?


Are you in Canada? NMD is not available in the US ...

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Last edited by kbsparky; 11-19-2010 at 06:26 AM.
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Old 11-19-2010, 09:10 AM   #3
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Spa wiring - NMWU or NMD890?


Sorry, I should have mentioned that. Yes I'm in Canada.
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Old 11-19-2010, 10:29 AM   #4
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Spa wiring - NMWU or NMD890?


He is not correct. NMWU is Wet and Underground rated. NMD is for Dry locations only. Outside is not a dry location.
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Old 11-19-2010, 10:45 AM   #5
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Spa wiring - NMWU or NMD890?


OK, that's what I figured, but I'm no electrician so I went with what the dude suggested. Googled it after the fact and what I could find out suggested the NMD90 wasn't suitable.

Thanks.
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