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-   -   Opinions on Tandem Breakers (http://www.diychatroom.com/f18/opinions-tandem-breakers-171356/)

Kyle_in_rure 02-07-2013 10:59 PM

Opinions on Tandem Breakers
 
I was wondering if anyone has opinions on tandem breakers..
I know the issue of shared neutrals comes up, but apart from that are they just as safe as regular/full sized breakers? Are there circuits that they shouldn't be used on? I've used a couple where needed, and have also seen an all-tandem 100 amp service (Surprise, it was in a mobile home:whistling2:)

k_buz 02-07-2013 11:03 PM

As long as the panel is rated to take tandem breakers

kbsparky 02-07-2013 11:05 PM

Personally, I don't like `em.

As for shared neutrals, most of the time, using a tandem on a multi-wire circuit is not proper installation protocol:

Many times, I have encountered a tandem breaker feeding a multi-wire circuit, it was incorrectly installed resulting in an overloaded neutral.

rrolleston 02-07-2013 11:18 PM

I installed a 20 space 40 circuit panel and ended up using quite a few tandems. But only think I notice is that the panel seems a little cramped with wires because it's smaller.

http://diysurvivalguide.com/gallery/...l_100_0566.JPG

frenchelectrican 02-07-2013 11:20 PM

I don't mind to use the tandem breakers only if they are listed in the panel and you have to becarefull with MWBC espcally this is true with GE breakers they are famous for this one if not carefull.

Single circuits that is not a issue.

Merci,
Marc

rrolleston 02-07-2013 11:24 PM

Yeah I like that my panel does not take up as much room as a 40 space panel would have. It's a mess because it was a rush to get back in our home someday I would like to straighten out some of the wires but not too big of a deal right now.

Glennsparky 02-07-2013 11:58 PM

I think tandems and quads have a higher failure rate than full size. Full size dissipates heat better. Pack in the tandems and the whole panel runs hotter. And do old work on a circuit, or replace a breaker, and many times you should be using an arc fault. I don't think they're ever going to make tandem arc faults.

busman 02-08-2013 05:53 AM

Quote:

Originally Posted by rrolleston (Post 1112176)
I installed a 20 space 40 circuit panel and ended up using quite a few tandems. But only think I notice is that the panel seems a little cramped with wires because it's smaller.

http://diysurvivalguide.com/gallery/...l_100_0566.JPG

Wow, quite a few code violations in that installation.

Mark

Speedy Petey 02-08-2013 06:25 AM

Quote:

Originally Posted by Glennsparky (Post 1112197)
And do old work on a circuit, or replace a breaker, and many times you should be using an arc fault. I don't think they're ever going to make tandem arc faults.

You DO NOT need to install arc-faults if you replace a breaker. :no:

k_buz 02-08-2013 06:36 AM

Quote:

Originally Posted by Speedy Petey (Post 1112250)
You DO NOT need to install arc-faults if you replace a breaker. :no:

...yet...

Speedy Petey 02-08-2013 06:41 AM

Quote:

Originally Posted by k_buz (Post 1112254)
...yet...

Bite yer tongue. :tongue_smilie:

jbfan 02-08-2013 08:21 AM

Who knows what's coming in the future!

rrolleston 02-08-2013 08:22 AM

Quote:

Originally Posted by busman (Post 1112243)
Wow, quite a few code violations in that installation.

Mark

Please let me know so I can fix them? With code reverences so I can learn why in the code book.

busman 02-08-2013 08:39 AM

1. There is a white wire attached to the ground bar.

2. The 8 black/red conductors aren't marked with the type. If they are part of a cable assembly, where are the EGCs?

3. The 200A CB is marked as Service Disconnect, but it is served by a 4-wire cable.

4. There appear to be circuit breakers that are not Siemens in the panel.

5. Depending on the wire size, the 8 red/black cables may be overfused and/or exceed the conduit fill limits.

Mark

Kyle_in_rure 02-08-2013 08:54 AM

I can imagine a tandem arc-fault breaker would be bigger than the AFCIs that are already almost too large to fit in the panel.....


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