Square D HOM = HOM ..... not

[Natfuelbilll]

What is the deal with HOM breakers.

I have a HOMC panelboard but the HOMT (twin) breakers don't fit ...

What's up with this?

 

[shepelec]

Is the panel made to take mini breakers?

 

[kwired]

they will only fit in certain spaces and some panels will not accept them at all.

Prior to 2008 NEC there was a 42 circuit limit in a panel and panels designed to accept tandems will not accept more than 42 (max) many times less like 30 or 40 circuits if using tandems.

I don't know if we will start seeing panels that will accept more tandems or not in the future. I have not seen any yet, but may not because still on 2005 NEC here and they would not be allowed.

 

[480sparky]

Look at the model number. If it's got something like 2020, 3030 or 4040 in the model number, it's not designed for tandems.

If it has a number like 2040, 2030, or 3040 it is.

The first pair of digits is the number of spaces, the second set is the number of circuits.

 

[brantmacga]

Look at the model number. If it's got something like 2020, 3030 or 4040 in the model number, it's not designed for tandems.

If it has a number like 2040, 2030, or 3040 it is.

The first pair of digits is the number of spaces, the second set is the number of circuits.

that's exactly right; you can also see a difference in the buss bar of panelboards that accept tandems.

even those that will take them only do so at the bottom of the buss bar unless its a 20/40, 6/12, 12/24, etc. . . in which case they will all accept tandems.

but the tandem space will have a buss bar that's notched on the outer edge.

 

[Natfuelbilll]

Any one ever see a Square D write up on these pecularities?

 

[satcom]

Any one ever see a Square D write up on these pecularities?

They are not pecularities, but designed that way, the Square D catalogs show bus placement and breaker information.