2/0 for 50-60' run to panel

jamiedolan

Hello;

I came across a small spool of 2/0 copper THHN tonight, at around .35 cent a foot. Per 310.60 this looks correct for 200A service. When I upgrade my service to 200A the run will be about 60' (from a fused dc outside at the meter to my main panel).

Do you think even with some voltage drop over that distance that I will be ok with the 2/0? I'd love to buy some of it at that price but don't want to waste the money if I should be using 3/0 to compensate for the distance.

Thanks
Jamie

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Jamie Dolan - Neenah, WI

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Gigs

That's really up to you. Some of the people can't tolerate their lights flickering when the A/C turns on and some people don't care.

Ohms/Ft: 0.000078, ohms for your run 0.00468. That's not bad.

Online calculator is saying 1% drop or 2.3 volts. Not bad at all.

jamiedolan

I won't be heavily loaded either. My average draw is very low, all major appliances are gas. I'm adding in the hot tub and an electric range insert, with everything running, including the new tub and oven, I might tip past 100a.

Sounds like I got myself a deal on some wire!

Thanks for your information.

Jamie

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Jamie Dolan - Neenah, WI

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jbfan

That is copper, right?

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jamiedolan

Yes it is.


Jamie

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Jamie Dolan - Neenah, WI

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gp_wa

Are we looking at the same NEC? Mine says 2/0 CU THHN is only good for 195 amps...

Is your panel rated to terminate at 90*?

chris75

Table 310.15(B)(6) would allow 2/0 cu for 200 amps.

kbsparky

2/0 for sixty feet won't have a noticeable voltage drop, in most residential applications. Go for it.

jamiedolan

Thanks Chris. Does that table still apply to the fed to inside panels, when you have a external disconnect that serves as your bonding point?

i.e. the outside disconnect would be the SE with grounds and neutrals bonded at that point. Then the feed I am discussing here would technically be a 4 wire sub panel feed.

I guess what I am asking is does 310.15(b)(6) only apply to the feeders used for unfused service i.e. between the meter / mast and the first fused disconnect?

Thanks
Jamie

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Jamie Dolan - Neenah, WI

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jamiedolan

Actually I think some of the cutler CH stuff is rated at 90 degree. What table where you looking at? I was looking at 310.60 which shows 175 @ 75 degree. Protecting that with the next size breaker available would be 200A.

But I think I may have been looking at the wrong table as chris pointed out.

Thanks
Jamie

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InPhase277

Table 310.15(B)(6) applies to service entrance, lateral, or feeder conductors in a residence. So, you are good there. And the table you should be sizing general conductors to is 310.16, there is no table 310.60.

chris75

I've never seen a 90 degree lug. not saying they dont exist, just never have seen one before.

gp_wa

310.16. I actually assumed 310.60 was a typo. 310.16 says 175 @ 75* here, too.


My little book doesn't have 310.15(b)(6), and Google laughs at me whenever I put "NEC" in a search. All I get is discussion about the table. Anybody have a link to the actual table?

zeek88

200 amp service, you need 3/0.

jerryh3

According to who?