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-   -   3 pole disconnect for single phase? (https://www.electriciantalk.com/f31/3-pole-disconnect-single-phase-272864/)

NDC 06-06-2019 03:21 PM

3 pole disconnect for single phase?
 
1 Attachment(s)
I have a really nice non-fusible ferraz shawmut disconnect that Ive have stored for a while. Its a 3 phase motor disconnect rated for 60 amps but id like to use it for a 2 pole car charger single phase. Id essentially be using only 2 of the 3 terminals. Is this code compliant?

Kevin_Essiambre 06-06-2019 11:53 PM

I personally don't see an issue with it. It opens all the ungrounded conductors.

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Cow 06-07-2019 12:08 AM

More often than not, I can get a 3p disconnect cheaper and faster than a 2p, so a 3p gets used.


It gets done all the time.

joebanana 06-07-2019 12:18 AM

I've seen it done quite often. As long as it opens all the energized conductors it could be a 2-pole toggle switch (depending) for all that matters.

CoolWill 06-07-2019 06:50 AM

Many 3 pole disconnects say in the instructions that when using them on single phase, use the two outer poles.

bob_says_hello 06-07-2019 10:26 AM

...and so long as it's an approved disconnect in an approved box.

since it's hard to make out if it is from the photo.

NorthernElectricain 06-10-2019 04:51 PM

As every one else mentioned you should be good to go, however I would be mindful not to land the neutral on the unused terminal. I don't think a Neutral should be broken inside a disconnect.

glen1971 06-10-2019 11:48 PM

Quote:

Originally Posted by NorthernElectricain (Post 5204108)
As every one else mentioned you should be good to go, however I would be mindful not to land the neutral on the unused terminal. I don't think a Neutral should be broken inside a disconnect.

Me either.. And yet I see it often and for no reason..

bob_says_hello 06-11-2019 12:47 AM

Quote:

Originally Posted by glen1971 (Post 5204200)
Me either.. And yet I see it often and for no reason..

Can go either way. Provided you break all ungrounded conductors at the same time there's no problem also breaking neutral too. It's just not needed.

Some projects preferred it, in the more 3phase systems where you don't trust the neutral being solidy grounded always, but that's more edge cases than a rule.

CoolWill 06-11-2019 06:14 AM

Quote:

Originally Posted by glen1971 (Post 5204200)
Me either.. And yet I see it often and for no reason..

If you want something truly isolated, that's what you do.

Incognito 06-11-2019 07:19 AM

I never open the grounded conductor in a disconnect but, like others have already said, you can.

14-016 Connection of devices
Devices required by this Section shall not be connected in any grounded conductors except where
a) the devices simultaneously or previously disconnect all ungrounded conductors

Cow 06-11-2019 08:41 AM

We really only break the neutrals when wiring fuel pumps.

That's about the only time we do it.

glen1971 06-11-2019 02:50 PM

Quote:

Originally Posted by CoolWill (Post 5204212)
If you want something truly isolated, that's what you do.

After I shut the breaker off, I'll have to start disconnecting neutrals in the panel then when I change out a fixture at home then.. (sarcasm).. lol..

CoolWill 06-11-2019 04:11 PM

Quote:

Originally Posted by glen1971 (Post 5204252)
After I shut the breaker off, I'll have to start disconnecting neutrals in the panel then when I change out a fixture at home then.. (sarcasm).. lol..

Don't you get sassy with me lady!:vs_mad:


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