100 a main in 42 cir pnl

[donselectric]

is it legal to back feed a 100 a breaker in a 42 ckt pnl
my buddy said 30 ckt max...
who's rite ?

 

[Jim W in Tampa]

Legal but will need a lock down kit

 

[stickboy1375]

Depending on the panel, you could buy a conversion kit, but to answer your question, there is no limit...

 

[donselectric]

i dint think so....and couldnt find it in the bible......

thanks

 

[cschmid]

I have read the bible to and yep no answer there and non in the code book either that I know of..But I am not a code expert either..

 

[templdl]

It is my understanding that it must be listed as such by UL. If one were to take a MLO and add a 100a breaker w/ a lock down kit it the modification UL list. Does the modification void its UL label.
I can't recall that the NEC has anything to do with other than what's included in Art 110 regarding the listing of the panel and applying as directed by the manufacturer etc..

 

[Dennis Alwon]

I think the OP is asking more about the number of circuits in the panel.

It does not matter. I can have a 100 amp breaker feeding a 40 circuit 200 amp main breaker panel. It is fine as long as the load is suitable for the 100 amp breaker. I can add another 40 circuit sub panel and it could still be okay if the load is still under a 100 amps.

I would ask your friend where he got the 30 circuit rule from.

 

[acrwc10]

I think the OP is asking more about the number of circuits in the panel.

It does not matter. I can have a 100 amp breaker feeding a 40 circuit 200 amp main breaker panel. It is fine as long as the load is suitable for the 100 amp breaker. I can add another 40 circuit sub panel and it could still be okay if the load is still under a 100 amps.

I would ask your friend where he got the 30 circuit rule from.

I do this all the time in houses. 200 amp main with distribution , in that a 100 or 125 amp feeder to another panel with 40 circuits for lighting and small apliance circuits out of it. Works well

 

[Jim W in Tampa]

By the time you pay for ML panel,100 amp breaker ,and lock down kit you could have likely just bought a 100 or 200 amp 40 circuit panel with main breaker.

 

[electricmanscott]

It is my understanding that it must be listed as such by UL. If one were to take a MLO and add a 100a breaker w/ a lock down kit it the modification UL list. Does the modification void its UL label.
I can't recall that the NEC has anything to do with other than what's included in Art 110 regarding the listing of the panel and applying as directed by the manufacturer etc..

You're understanding is misunderstood. This is perfectly acceptable.

 

[donselectric]

where can you get a 100 amp main with 42 cir ?

 

[LawnGuyLandSparky]

100a main or 100a MLO in a 20/40 is very common.

 

[donselectric]

100a 30 ck around here...
thats why i want to back feed a 100 in a 42 ckt pnl

 

[iwire]

100a main or 100a MLO in a 20/40 is very common.

donselectric, I bet you can find them, it would take 20 'twin' breakers to get 40 circuits into.

That is why it's called a 20/40

 

[donselectric]

i hate those pos....

 

[LawnGuyLandSparky]

Well there's a 30/40 if that floats your boat. Then again, with the price of breaker panels, how much more would it cost to install a 200a with main, 40 (full 1" spaces) circuits and add a 100a backfed main?

 

[kbsparky]

100a 30 ck around here...
thats why i want to back feed a 100 in a 42 ckt pnl

You could buy a main lugs panel, and install a 100 Amp main in that.

Example: Square D QO142L225 main lugs panel (convertible to main breaker) +
QOM2100 main breaker.

No other lock down needed, since the QOM "main" breakers are bolt-on.

 

[electricmanscott]

i hate those pos....

Care to tell me why?

 

[Gene Kelly]

100amp main/42curcuit panal

100amp main/42curcuit panal

Use Hold Down Kit For Any Back- Fed Breaker

 

[donselectric]

because they dont seem to attach to the bus very well for one
they burn up (at least all the trailer installs i've delt with
and they cram the panel cause theres 40 cks in a 20 ckt can..