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rovers1973 02-12-2009 09:13 PM

Question on 240v double pole breaker locations
 
Does it matter where double pole breakers (240 stuff like the stove) are placed in a panel? Should they be spaced out in the panel or can they all be next to each other? Just wondered if heat buildup on the bus might be an issue.

220/221 02-12-2009 09:30 PM

The only thing I specifically try to isolate are AC breakers. I live in the desert and those things are always causing issues. You might want to give some breathing room to electric heat circuits.

bwalley 02-12-2009 09:30 PM

Quote:

Originally Posted by rovers1973 (Post 229522)
Does it matter where double pole breakers (240 stuff like the stove) are placed in a panel? Should they be spaced out in the panel or can they all be next to each other? Just wondered if heat buildup on the bus might be an issue.

They can be wherever you want them in the panel.

If they are sized proplerly and installed properly they will not generate any significant heat.

I group mine at the top, next to each other and even amounts on the left and right.

On the A/C units I will stack the condensing unit and Air handler breakers.

The rest of my breakers I group together like the Arc Fault Protectors are all together.

spark-451 02-12-2009 09:32 PM

placement of a 220 2 pole circuit breaker should not be a problem in a single phase 208 panel which is a standard household panel. putting them next to each other does not affect them and there is no way to ballence them with only two phases. if you have a 3 pole panel you may want to alternate the pairs of phases that you use. ex. phases (A B)(B C)(C A)

Stubbie 02-12-2009 09:47 PM

Quote:

Originally Posted by spark-451 (Post 229535)
placement of a 220 2 pole circuit breaker should not be a problem in a single phase 208 panel which is a standard household panel. putting them next to each other does not affect them and there is no way to ballence them with only two phases. if you have a 3 pole panel you may want to alternate the pairs of phases that you use. ex. phases (A B)(B C)(C A)

That ain't the case out here in the midwest.....we have 120/240 3 wire single phase

208Y120 4 wire wye three phase is only in commercial.

ctsmiths 02-12-2009 10:11 PM

Yeah I havent run into too many houses with 3 phase, actually I havent run into any. :)

rovers1973 02-13-2009 10:13 AM

Thanks for the info guys. I will group mine together as well.

wirenut1110 02-13-2009 02:32 PM

Ah come on guys, y'all don't have any of that 1ph/3 wire 208 stuff:thumbup::laughing:

Sorta reminds me when a guy came in the supply house and says" I need some of that 240 wire" so the guy goes and cuts some 16 stranded and brings it back and the guy says "no,no, I need 240 wire" So the supply house guy says "this will work cause this is 600 volt wire" and the other guy says"are you kidding me man, I ain't workin on nothin that big" True story

micromind 02-13-2009 08:12 PM

120/208 1 phase is pretty common for apartment buildings. The main service is 120/208 3 phase, and the sub panels are single phase. Two legs of a wye = single phase.

I can think of several houses that have 3 phase power. When I lived in central Oregon, the wells are pretty deep. 800' is about normal. The cost savings on wire alone almost makes up for the extra cost of a 3 phase service. A 240 open delta is not much more costly than single phase.

My house has a 120/208 3 phase 4 wire wye. The well pump, A/C, and a bunch of shop equipment is 3 phase.

Rob

Stubbie 02-13-2009 09:44 PM

True that is the case here for apartment complexes. We don't see it as a rule in single family residences. I was nearly knocked off an oil rig one time by a shorted to the switch box 480 single phase ran about 1000' out to the platform... felt like 100 bumble stings all at once.

We see 208 some on farms but rare... 240 is more useful. Some COOP farms use the heck out of 208 3 phase. It's almost always lights and receptacles around here in commercial and some door lifts and freight elevators.... 277 is pretty common also just not in residential single family.

wirenut1110 02-14-2009 06:15 AM

Okay, I was just trying to have some fun because it was stated that
Quote:

208 was a common household panel
Around here some of the requirements for 3-phase service is that you have at least one motor that is 7 1/2 HP or more, or a combination of motors at least 15 HP. You'll also pay a pretty penny for it too.

Only apartments I've seen with 3ph 208 service are the ones that either provide laundry equipment, and/or gas appliances(range, water heater, etc.) or it was an old commercial/industrial facility converted to apts.

Even some with 480/277 services(high rise mostly) for elevators, HVAC equip, and common area security lighting, with transformers on each floor/building to provide receptacle/lighting circuits.


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