Breaker & Wire Size

[Alwayslearningelec]

Can you have FUSED 200A switch feeding load with #8 wire? Doesn't wire need to be rated ampacity to match switch size?

 

[infinity]

Probably not but what kind of breaker and what kind of load?

 

[petersonra]

could be OK if it is a legal tap conductor. biggest problem might be that the lugs on the 200 A switch are not listed for use with a #8 wire.

 

[Alwayslearningelec]

Probably not but what kind of breaker and what kind of load?

AC unit with VFD and disconnect

 

[infinity]

AC unit with VFD and disconnect

Conductors have to be sized to 125% of the input current of the VFD. With a 200 amp OCPD I doubt that #8 is the correct size.

 

[Alwayslearningelec]

Conductors have to be sized to 125% of the input current of the VFD. With a 200 amp OCPD I doubt that #8 is the correct size.

Question is what's the input current. Don't know.

 

[augie47]

Question is what's the input current. Don't know.

No way for you to know without more input (RFI) or on-site inout BUT as noteds, with a 50 amp wire and 430.122 it's practically impossible that it would meet Code unless it'sa tap to another OCP device and meets 240.21

 

[JoeStillman]

AC units never have MCA and MOCP that match. Still, 50:200 is implausible. Check the nameplate.