2020 NEC 230.71 Change Limits 6 Disco Rule

[al hildenbrand]

1

 

[texie]

Yep, that is the case. I think this stems from the movement in the 2017 edition to cover the line side lugs. But covering the line side lugs in the case of multiple disconnects in the same panel was kind of pointless so they just decided to prohibit the whole concept. This really is a big change after all these years of this being a standard practice. Maybe this is a good change as it will be safer.

 

[Dennis Alwon]

Yep, that is the case. I think this stems from the movement in the 2017 edition to cover the line side lugs. But covering the line side lugs in the case of multiple disconnects in the same panel was kind of pointless so they just decided to prohibit the whole concept. This really is a big change after all these years of this being a standard practice. Maybe this is a good change as it will be safer.

I always thought the main lug set up with 6 breakers was dangerous. You cannot work in the panel with the power disconnected. Unfortunately I was distracted once and my screw driver slipped and shorted to the buss bar. I actually blew the transformer....Cost me $1000.....

 

[synchro]

As I'm understanding this, a main lug six-pole panel is not possible anymore.

Could you still use it if you had a back-fed breaker for the service disconnect? Although there probably needs to be a barrier or shield over the exposed service conductors at the breaker terminal that is listed for the purpose.

 

[Dennis Alwon]

Could you still use it if you had a back-fed breaker for the service disconnect? Although there probably needs to be a barrier or shield over the exposed service conductors at the breaker terminal that is listed for the purpose.

Of course but now you have a main breaker and are not using the 6 disconnect rule. By the way, you can still have 6 disconnects but they must be in separate enclosures