60A single-pole breaker

[SceneryDriver]

I have to feed some equipment through a slip ring; my client needs (3) 20A 120VAC circuits on the rotating portion of the machine. I'm concerned about the potential for a damaged conductor brush causing an "open neutral" situation if I supply the system with a 240V 3-wire system.

I'm proposing to supply a 60A 120V circuit, pass it through the slip ring, and then protect down to 20A using Class CC fuses on the rotating portion of the machine.

I don't think I've seen a single pole breaker larger than 30A. Is that statement correct? Client has a Square D panel (he doesn't know if it's HOM or QO). I can use a 2-pole 60A breaker and just leave one leg unconnected, but that wastes panel space and seems a tad sloppy. Thoughts?


SceneryDriver

 

[ptonsparky]

Use the 260. It looks and works great from here. Not worth the headache.

 

[roger]

Don't know about Homeline but single pole QO 60's are not hard to get however, as ptonsparky says, using a two pole is probably the easiest solution.

Roger

 

[oldsparky52]

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[electrofelon]

Single poles are made up to 70A. whether it is in stock at your supply house may be another question. I have a 70 amp single pole here, was in stock at my supply house believe it or not.

 

[Jraef]

I think HOM style stop at 50A 1 pole though. But is this a residential customer with a slip ring? Probably not, in which case I'd say the chances of it being Homeline are slim, Q0 was the standard for years and years and still is in commercial and industrial users.

 

[Dennis Alwon]

It is probably cheaper to buy a dp breaker and use one phase then it is to buy a sp 60

 

[SceneryDriver]

I think HOM style stop at 50A 1 pole though. But is this a residential customer with a slip ring? Probably not, in which case I'd say the chances of it being Homeline are slim, Q0 was the standard for years and years and still is in commercial and industrial users.

No, not a residential customer. It's a summerstock theater out in the sticks of northwest IL, with bastard-leg delta power. Everything except the AC compressors and air handler are split-phase 120/240; HVAC is 240V 3-phase. Slip ring is being considered to bring power to the revolving stage for use with lighting and sound equipment (permanent part of the stage). The panels in the building are an interesting hodge-podge of QO, HOM, BR, and probably others as well. It's out in the sticks, and as the building was rewired/remodeled/changed/updated over the years, whatever was cheapest and most available was used.

I didn't realize 1P breakers over 30A were available. I may still do a single-pole breaker, just so people down the line don't get confused by the empty pole.


SceneryDriver

 

[Little Bill]

Most common application I have found for a 60A single pole breaker was for a lighting panel fed by 3 ph.