Maximum am pacify for #14 - #10

[Littlecowboy]

The am pacify table says that #14 is only good for 15 amps....#12 for 20 and#10 for 30.......so if you're using say #10 for a motor load of say 25 amps then how can you be allowed to protect it with a td fuse of 1175% or more?

 

[GoldDigger]

The am pacify table says that #14 is only good for 15 amps....#12 for 20 and#10 for 30.......so if you're using say #10 for a motor load of say 25 amps then how can you be allowed to protect it with a td fuse of 1175% or more?

The situation for motor circuits is very different from other circuits, in that the overload (as distinct from short circuit or ground fault) current protection is considered to be in the overload device for the motor.
All the branch breaker needs to provide is the short circuit and ground fault protection for the conductors, which it can do even with a much higher nominal value.

BTW, where did you get the 1175%? The motor rules allow varying multiples of the FLC depending on the motor type and application.
Where a piece of equipment specifies an MCA and a MaxOCPD, the breaker or fuse can be up to the MOCPD value on the nameplate if that is the only equipment on the circuit.

 

[topgone]

The situation for motor circuits is very different from other circuits, in that the overload (as distinct from short circuit or ground fault) current protection is considered to be in the overload device for the motor.
All the branch breaker needs to provide is the short circuit and ground fault protection for the conductors, which it can do even with a much higher nominal value.

BTW, where did you get the 1175%? The motor rules allow varying multiples of the FLC depending on the motor type and application.
Where a piece of equipment specifies an MCA and a MaxOCPD, the breaker or fuse can be up to the MOCPD value on the nameplate if that is the only equipment on the circuit.

Haha! Please go easy on the little cowboy. Jumpy fingers perhaps? Methinks the number "7" is not part of the percentage.:bye:

 

[ActionDave]

The am pacify table says that #14 is only good for 15 amps....#12 for 20 and#10 for 30.......so if you're using say #10 for a motor load of say 25 amps then how can you be allowed to protect it with a td fuse of 1175% or more?

For a motor you can use 12AWG up to 30A. Look at 240.4 (G) and 430.51 and wrap your head around what Golddigger is saying......

Motors will draw about six times its normal current on start up so the code allows a larger than normal overcurrent device on smaller wire.

The heaters on the motor will protect the wire from overload i.e. drawing too many amps for a long time. The fuse is only there to protect the wire from short circuit and ground fault amps which would be like two thousand amps for a micro second so it doesn't matter if it is a 20A fuse or 30A or even 50A.