Need help with air compressor

[Tech89]

Bought a air compressor, here's a link to said compressor http://www.industrialairusa.com/prod_detail.php?model=IV5076055&cat=3
I need to wire it, but I'm unsure what to use for wire. My last compressor was wired with 10-3 SOW cord to the outlet I believe, I can't remember exactly. Does this seem correct? I wired it myself, I just cart remember what I used. I like the SOW because it was nice a flexible. Thanks in advance for everyone's help.

-Pat

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[wyliesdiesels]

I looked through the manual and it doesnt list the HP whoch is needed to size the wire and circuit.

Can you post a pic of the nameplate.

If it is truly 5HP(its listed as 5RHP), then it must be hardwired and will
Need 35a rated wire- #8/2 NM-b or #10 THWN.

 

[PWC Repair]

then it must be hardwired

Why is that? My electric stove is rated at more than that and it has a pigtail. Could he not utilize a setup like that?

 

[pattenp]

Motor loads have different NEC requirements as to how they are to be wired. The HP is used to cross reference a table in the NEC code book to get the amps. Plus the nema plugs most people will likely try to use are only rated up to 3 - 3.5 HP. So 5HP needs to be hardwired, no plug and outlet.

 

[wyliesdiesels]

Why is that? My electric stove is rated at more than that and it has a pigtail. Could he not utilize a setup like that?

A stove is different than a motor because of the HP rating.

But im not sure why youre referencing a pigtail.

do you mean cord and attachment plug?

 

[Notgrownup]

I used a #8 cable and wired mine to a plug with a matching receptacle in the wall, this way I can move it easily if I want.

 

[Tech89]

I guess I'll be running another line from the breaker box, I already have 2 220 outlet coming out of it haha.

 

[Tech89]

I used a #8 cable and wired mine to a plug with a matching receptacle in the wall, this way I can move it easily if I want.

That's exactly what I wanted to run a plug and outlet. I did that with my last 5 HP 2 stage compressor, I used a Nema plug as pictured. I wasn't aware that this wasn't okay.

-Pat

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[pattenp]

That's exactly what I wanted to run a plug and outlet. I did that with my last 5 HP 2 stage compressor, I used a Nema plug as pictured. I wasn't aware that this wasn't okay.

-Pat
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NEC is all about safety and it's not that the plug can't handle the amperage it's about pulling the plug on a motor that's 5HP and greater under load because of the potential of arcing and shooting sparks into you eyes. Technically a plug is a disconnect and a standard nema 3HP plug is not approved as a disconnect for a 5HP motor because it does not provide any arc shielding. A pin and sleeve plug is what needs to be used but they are expensive.

 

[Tech89]

NEC is all about safety and it's not that the plug can't handle the amperage it's about pulling the plug on a motor that's 5HP and greater under load because of the potential of arcing and shooting sparks into you eyes. Technically a plug is a disconnect and a standard nema 3HP plug is not approved as a disconnect for a 5HP motor because it does not provide any arc shielding. A pin and sleeve plug is what needs to be used but they are expensive.

Would you be able to link a few. I don't know that I've seen those before.

-Pat

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[PWC Repair]

A stove is different than a motor because of the HP rating.

But im not sure why youre referencing a pigtail.

do you mean cord and attachment plug?

yes, thats what i meant.

 

[pattenp]

Would you be able to link a few. I don't know that I've seen those before.

-Pat

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I assume you know how to use Google. Google "pin & sleeve plug".

 

[wyliesdiesels]

I used a #8 cable and wired mine to a plug with a matching receptacle in the wall, this way I can move it easily if I want.

What is the amp rating on your stove?

 

[Tech89]

I assume you know how to use Google. Google "pin & sleeve plug".

Sorry, yeah I googled it afterwards. Those are fairly spendy.

-Pat

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[Norcal]

Sorry, yeah I googled it afterwards. Those are fairly spendy.

-Pat

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"Fairly spendy"? They are ****** expensive, I have them on my MillerMatic 251.

 

[AntonLargiader]

It would be great if we had a sticky for compressor wiring!

I was just given a 240V 15A compressor. Although 15A doesn't show up in the NEC table, it seems like about 2.5 HP? It has no plug but it was probably on a 6-20. As I have a 6-20R about fifteen feet away but out of sight, it would be great if I could just make a cord for that distance. Hardwiring is an option but it seems like such overkill for this, which almost certainly came with a 6-20. Cooper says 6-20 is rated at 2HP. How does NEC treat this? To get to 3HP I need to go to 6-50 and then there are wire size and breaker issues, right?

Is a 6-20 legit for this compressor? Nameplate below. Oh, and there's a big "6 HP" sticker on the compressor but fortunately not on the nameplate.

 

[pattenp]

Anton, I'd just put a #12 20A cord on it with the 6-20 plug and not worry about it.

 

[wyliesdiesels]

It would be great if we had a sticky for compressor wiring!

I was just given a 240V 15A compressor. Although 15A doesn't show up in the NEC table, it seems like about 2.5 HP? It has no plug but it was probably on a 6-20. As I have a 6-20R about fifteen feet away but out of sight, it would be great if I could just make a cord for that distance. Hardwiring is an option but it seems like such overkill for this, which almost certainly came with a 6-20. Cooper says 6-20 is rated at 2HP. How does NEC treat this? To get to 3HP I need to go to 6-50 and then there are wire size and breaker issues, right?

Is a 6-20 legit for this compressor? Nameplate below. Oh, and there's a big "6 HP" sticker on the compressor but fortunately not on the nameplate.

Thats probably a 3HP since NEC lists the FLC for a 3HP at 17a. FLC is different than FLA in that FLC is the max current a 3HP motor would have under the NEC. Most true 3HP motors will be less than 17a.

Re: sticky I plan on adding a compressor wiring post to my electrical FAQ sticky when i get the time.