Homeline and twin breakers

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ivsenroute

ivsenroute

Senior Member
Location
Florida
Which Homeline panels & subs can accept twins?

I have been getting conflicting information from other EC's and the supply house.
 
F

frenchelectrican

Senior Member
Location
Nord'est Wisconsin et Paris France
ivsenroute said:
Which Homeline panels & subs can accept twins?

I have been getting conflicting information from other EC's and the supply house.
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The most impoart part is read the panel model number that will tell if that will take the "twins" or duplex depending on what ya saying.

If the model number like this example HOM3040M200

The 30 which I underline this that mean 30 fullsized breakers while the 40 which I highlited in bold that mean it can have 20 full size breaker and 10 twinner or duplex breaker.

And typically for twinner { dupex } breaker will be landed on the bottom part of breaker box { some of them will show the diagram for it } and the bussbar tabs will look diffrent as well.

Merci,Marc
 
infinity

infinity

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Staff member
Location
New Jersey
Occupation
Journeyman Electrician
We just look at the diagram on the inside of the cover. As Marc said it's usually the bottom breakers. Or just look at the model number.
 
ivsenroute

ivsenroute

Senior Member
Location
Florida
Yeah, I was all over the SqD website and could not find anything.

I have not been to the homeowner's house yet so I asked him to describe is panel other than what he told me or find a panel number but no help. I just asked him to count the breakers for me before I get there. It is one of those deals where the panel is full according to him and he wants me to show up and do the job but just sheetrocked his garage where the panel is (now he wants to do work). I already warned him that he may need a sub panel.

I guess we will find out when I drive down there on Saturday.
 
480sparky

480sparky

Senior Member
Location
Iowegia
electricmanscott said:
All of them. ;) So I've heard. :grin:
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A model with 2030 and 3040 in the number will, but not a 3030 or 4040. The first half of the number is the number of spaces, the second half is the number of circuits. So a 2030 will have 20 spaces and can have 30 circuits, allowing 10 tandems (usually at the bottom). A 4040 will have 40 spaces for 40 circuits.

You can also look at the bus bars. If they're square and flat across the front edge (the end towards you), then it only accepts full-size breakers. If there's a V-notch in it, it will accept a tandem on either side.
 
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jim dungar

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Location
Wisconsin
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PE (Retired) - Power Systems
480sparky said:
A model with 2030 and 3040 in the number will, but not a 3030 or 4040. The first half of the number is the number of spaces, the second half is the number of circuits. So a 2030 will have 20 spaces and can have 30 circuits, allowing 10 tandems (usually at the bottom). A 4040 will have 40 spaces for 40 circuits.
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This is partially incorrect.
A Homeline panel that does not accept twins will only have (1) set of digits in its part number like HOM30Mx. A panel that accepts twins will have (2) sets of digits in its number like HOM3040Mx

Look in the Square D Digest on page 1-14.
 
iwire

iwire

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Staff member
Location
Massachusetts
From Square D's FAQ

Question If a HOMELINE load centers catalog number cannot be determined, how can you tell if the load center will accept tandem circuit breakers?

Answer Inspect the bus stab that the circuit breaker plug-on jaw connects to. The bus stab that will accept a tandem circuit breaker will be notched in the middle. A solid bus stab will accept full sized circuit breakers only.
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Question Why doesn`t a HOMT2020 tandem breaker fit in all Homeline load centers ?

Answer The HOMT breaker has a rejection feature (short notch ) to keep it from fitting in Homeline load centers that are designed and UL listed for non tandem breakers like the HOM120 . Only Homeline load centers that are designed and UL listed for tandem breakers will accept the HOMT Tandem circuit breakers.
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480sparky

480sparky

Senior Member
Location
Iowegia
petersonra said:
Why? Or is that just the wya they are made for some reason? I can't imagine why it would be safer for them to be at the bottom somehow.
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Sq D just puts the v-notched bus bars at the bottom. I 'reckon it's to keep the heavy loads (ie, 2-pole) towards the top so they can dissapate heat better. Other than that, I can't think of any good reason why tandems would be at the bottom.
 
ivsenroute

ivsenroute

Senior Member
Location
Florida
Job is done, froze my tush off because the work was in the unheated garage and outside. Woke up to 17 deg F this morning.

I added 2 more 20A twins and a new 30A 240 circuit for a garage heater. He is now up to 36 in the panel so he has room for more twins but not many because he has electric baseboard heat.

Did not wear the inspector hat at all today and now I am cold, tires and have more nicks in my hands. :)
 
electricmanscott

electricmanscott

Senior Member
Location
Boston, MA
480sparky said:
A model with 2030 and 3040 in the number will, but not a 3030 or 4040. The first half of the number is the number of spaces, the second half is the number of circuits. So a 2030 will have 20 spaces and can have 30 circuits, allowing 10 tandems (usually at the bottom). A 4040 will have 40 spaces for 40 circuits.

You can also look at the bus bars. If they're square and flat across the front edge (the end towards you), then it only accepts full-size breakers. If there's a V-notch in it, it will accept a tandem on either side.
Click to expand...

I'm well aware of all of this. In fact I mentioned some of it in my post that you partially quoted.

I also know that I can get a tandem into any panel. :wink:
 
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