How many tandem breakers does my panel accept?


  #1  
Old 08-10-22, 09:12 AM
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How many tandem breakers does my panel accept?

Hi guys,

I couldn't find any tag to identify what's my panel's model. All I know it is a Siemens with 24 breakers slots.

Currently, there are two breakers being shared with two rooms, but I want to split them. As there is no more space in the panel, I thought about putting two tandem breakers.

I also need to add two more double pole breakers. One for an electrical fireplace (240v) and another for a new dryer.

So in total, I'd like to install:
- 2 single pole tandem 15 amps,
- 1 Quad 15/15
- 1 Quad 15/30.

Could you guys help me check my panel's compatibility, please?




 
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Old 08-10-22, 09:41 AM
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Welcome to the forums.

All the information needed is on the sticker inside the door.
 
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Old 08-11-22, 01:56 PM
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Thanks for replying.

The door is gone. There isn't any sticker with the model.
 
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Old 08-11-22, 03:42 PM
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On the locations where tandems are accepted, where the breakers attach will have a notch in the middle of the bus.
The yellow squares have the notch that is OK for tandems, the red circle shows the bus without the notch.


 
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Old 08-11-22, 04:59 PM
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That panel part on the floor in the 2nd picture looked like a panel cover with sticker.
 
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Old 08-15-22, 07:30 AM
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@PJmax, that sticker is only labels to what room each breaker is for. It doesn't have any model number.

@Tolyn Ironhand, All bus slots don't have that notch in the middle. I guess it is a Siemens feature because their breakers don't have that lip in the middle to prevent you from installing it to the wrong bus.
I think this panel allows me to put a tandem breaker anywhere, just not sure how many it can take.



 
  #7  
Old 08-15-22, 12:55 PM
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Show us the door stickers anyway.
 
  #8  
Old 08-22-22, 01:46 PM
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I think this panel allows me to put a tandem breaker anywhere, just not sure how many it can take.
That's a definite possibility, but the tandem you posted in post #6 is a non-CTL tandem breaker for replacement purposes only in pre-1968 panels. It's the wrong one! You would have to use a CTL tandem such as catalog number Q1515. https://www.lowes.com/pd/Siemens-QT-...reaker/1007889
 
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Old 08-24-22, 09:08 AM
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@Casualjoe thanks for replying.

I will return the Q21515CTNC and Q1515NC. I hope I can find the ones without NC. My local Lowes and HomeDepot don't have it.

Is there any difference internally like in the circuit itself between both NC and without NC?
 
  #10  
Old 08-25-22, 06:30 PM
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That is a Canadian panel and if you are in Canada you will only see the NC versions. No CTL there so theoretically tandems (called duals and quads) are allowed everywhere.
Look at page 12 of the Canadian catalog: https://assets.new.siemens.com/sieme...adcentres1.pdf
 
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