AC conduit

[hhsting]

I have AC cable going from POCO meter outside wall thru townhome wall into main service disconnect panelboard inside townhome garage. I am confused I know that metallic conduit would require bonding bushing however does AC cable require bonding bushing above case from inside service disconnect? Is it anywhere in code?

 

[tom baker]

Yes

 

[augie47]

Step 1.
Is AC Cable acceptable for Service
(Hint: 230.43)

 

[hhsting]

No 230.43 doesn’t list AC cable however MC cable, FMC, LFMC is listed. I would wonder if MC cable,FMC, LFMC would need bonding bushing and bonding jumper from main service disconnect it’s for Tomwnhomes 240/120V single phase?

 

[Eddie702]

I would say bonding on both ends and AC cable can not be used

 

[hhsting]

I would say bonding on both ends and AC cable can not be used

Ok which code section for FMC, LFMC, MC cables?

 

[Eddie702]

230:43 lists what you can use for service conductors/raceways. Bonding 250:92 B

 

[electrofelon]

Ok which code section for FMC, LFMC, MC cables?

250.92

 

[electrofelon]

Strange AC is not listed in 230.43. Not that I would want to use it and its only available up to 1 AWG, but just a curiosity.

 

[hhsting]

230:43 lists what you can use for service conductors/raceways. Bonding 250:92 B

I can see it for metal conduit but MC cable has no conduit it has metal sheath. How can one use bushing be used on MC, LFMC cable?

 

[LarryFine]

I'd say it's equivalent to a cable in this case, and the sheath should be ignored.

Maybe that's why it's not suitable: there's no proper way to bond the sheath.

 

[hhsting]

I'd say it's equivalent to a cable in this case, and the sheath should be ignored.

Maybe that's why it's not suitable: there's no proper way to bond the sheath.

But code does say NEC 2014 Section 250.92(A)(1) service cable armor or sheath that enclose service conductor and one of the methods of bonding 250.92(B)(4) bushing????

 

[electrofelon]

IF you start out looking at 250.92(B), I could see how one could interpret that as not required and MC connector to have a bonding busing on it, because it refers to "service equipment, service raceways, and service conductor enclosures" and MC cable is none of those. However if you start with 250.92(A), that covers MC cable sheath, and (B) is the method for complying with (A) so I think it is clear, you need a BB on a service MC connector.

 

[hhsting]

IF you start out looking at 250.92(B), I could see how one could interpret that as not required and MC connector to have a bonding busing on it, because it refers to "service equipment, service raceways, and service conductor enclosures" and MC cable is none of those. However if you start with 250.92(A), that covers MC cable sheath, and (B) is the method for complying with (A) so I think it is clear, you need a BB on a service MC connector.

Is their such a thing as BB for LFMC or MC cable in market metallic cable sheath not metallic conduit?

 

[electrofelon]

Is their such a thing as BB for LFMC or MC cable in market metallic cable sheath not metallic conduit?

Huh? No its just a regular bonding bushing that goes on the MC or LFMC connector.