Tandem breaker limitations in service panel

[dm9289]

I have a customer with a 16 spot 100A Murray that was full and he wanted to add 4 circuits using tandem breakers. My first thought was what was connected to all these circuits and could a 100A service support this I came up with a calculation of about 82A so this was Ok (alot of split up circuits to avoid or eliminate old knob and tube). Next I suggested a sub-box but do to space and customer preference he did not want this. I could not find anything prohibiting for example filling the whole box with tandems in 2008 NEC am I missing something this just dont seem right? If I did do this would I be required to add a neutral bar so that each wire has its own screw or could I double up putting more than one wire under the neutral bar?

 

[buddhakii]

You will have to check the U.L. listing of the panel. It should have a maximum number of tandem breakers that can be installed, and a maximum number of circuits that can be installed.

 

[480sparky]

Sometimes you just can't do what the customer wants with the money they want to spend. You can't buy a Ferrari with what a Kia costs.

If the panel is full, and won't accept tandems, then a subpanel is about the only option left.

 

[infinity]

Usually the diagram on the inside of the cover will depict if, and how many, tandem CB's can be installed.

 

[bmwnut]

If this is an 2008 inspection you will need afci breakers and i think they do not make them in tandem. your box should list the number of tandems you can install go with a subpanel