DIY Home Improvement Forum banner
1 - 12 of 12 Posts

·
Registered
Joined
·
52 Posts
Discussion Starter · #1 ·
Hi all,
I have a GE TMC4020CCU Powermark loadcenter (Canadian model) with 40 spaces. The circuit diagram indicates that it can take 80 1/2" breakers (THQP) in any position. But it then says the maximum number of 2 pole THQP breakers is 38. What I don't understand is why this number is not 40? Are there slots in the panel that won't accept 2-pole THQP breakers?
This model is the same as the GE TM4020C80 US model.

A link to the wiring diagram is included in the attachments

Thanks in advance for any help
 

Attachments

·
A "Handy Husband"
Joined
·
13,533 Posts
A THQP 2 pole breaker bridges across 2 slots so on each side of the panel you lose the top and bottom 1/2 position.

Sent from my RCT6213W22 using Tapatalk
 

·
Registered
Joined
·
52 Posts
Discussion Starter · #4 ·
Thank you. That makes sense. I was looking to put a THQP double pole in the top right 1" position (slot 2). So basically I can't do that. I will need to move things around as that was my last open slot.
 

·
A "Handy Husband"
Joined
·
13,533 Posts
Follow up question: do the THQP double poles all need to start on an odd 1/2" slot?
Yes. They need to bridge 2 slots so they pick up 120 volts for each pole so the output is 240. You can use single pole THQPs in the other half slots.

Sent from my RCT6213W22 using Tapatalk
 

·
Registered
Joined
·
2,437 Posts
I am assuming that this is a hypothetical question. If you need 38 - 240 volt circuits, you need more than a 200 amp panel and not use crappy thin breakers. I know this is not the case.
 

·
Registered
Joined
·
52 Posts
Discussion Starter · #9 ·
It was more to try to understand in which positions I could add the thin THQP 2 pole breaker. My panel is full except for slot 2. I currently have 2 THQP breakers. One 30 amp and one 20 amp. I plan to replace 2 standard 30 amp breakers with 2 slim 30 amp breakers to make room for 2 slots.
Do these THQP breakers have a bad reputation? I have never had any issues with the 2 I have.
 

·
A "Handy Husband"
Joined
·
13,533 Posts
Install the 2 pole in the bottom of slot 2 and top of slot 4. Fill the remaining half spaces with single poles.

Sent from my RCT6213W22 using Tapatalk
 

·
Registered
Joined
·
403 Posts
My experience with 1/2 size breakers is, that over time, their inability to dissipate heat causes problems such as breaker failure. Before you install too many, consider a sub panel.
 

·
A "Handy Husband"
Joined
·
13,533 Posts
My experience with 1/2 size breakers is, that over time, their inability to dissipate heat causes problems such as breaker failure. Before you install too many, consider a sub panel.
I have some GE THQP (half slot sized) breakers in my main panel that have been there since the house was built 31 years ago. I have rearranged a few with some changes I have made. Never an issue but I will admit I keep them on lightly loaded circuits.
 
1 - 12 of 12 Posts
Top