2 ea 20 amp on a 30 amp # 10 wire circuit?

[Patmandad]

i have a situation in an intermediate data closet where I have 1 breaker space in my emergency power panel and I need 2 circuits. can I run #10 on a a 30 amp breaker to 2 single 5-20R?

 

[roger]

See Table 210.21(B)(3)

 

[infinity]

Run the #10's to a 2 circuit sub panel with (2) 20 amp OCPD's.

 

[CoolWill]

Use a one of these handy dandy box cover u it's from Eaton...

 

[d0nut]

If it is truly an emergency system, what is being proposed probably will not work. I think it would be very difficult/impossible to coordinate a 20A fuse or circuit breaker with a 30A circuit breaker.

What loads are being fed? Are they even permitted to be on emergency power?

 

[a.bisnath]

* need to take combined load into consideration , if it adds up to more than 30 amps , there can be a problem. there is also an 80% load 'rule' (or better practice guideline) to take into consideration for subcircuits. I always try yo go with the 80% or less loading guideline.

 

[CurrentFlow]

IMO, Table 210.21(B)(3) says no. You can use #10 but only a 20A breaker.

 

[roger]

IMO, Table 210.21(B)(3) says no. You can use #10 but only a 20A breaker.

Correct.