Terminal bar and subpanel questions

[tonype]

In a main panel (I apologize if my terminology is incorrect), bare grounding conductors and grounded neutral conductors can share the terminal bar.

In a sub panel (downstream panel?) separate terminal bars are needed.

Does this apply when the downstream panel is serviced by an SE cable off a breaker (say 100 amps) in the main panel and has it own main breaker (another 100-amps) - in essence, 2 100-amp breakers in series)?

 

[petersonra]

In a main panel (I apologize if my terminology is incorrect), bare grounding conductors and grounded neutral conductors can share the terminal bar.

In a sub panel (downstream panel?) separate terminal bars are needed.

Does this apply when the downstream panel is serviced by an SE cable off a breaker (say 100 amps) in the main panel and has it own main breaker (another 100-amps) - in essence, 2 100-amp breakers in series)?

is SE cable even allowed for this?

 

[don_resqcapt19]

In a main panel (I apologize if my terminology is incorrect), bare grounding conductors and grounded neutral conductors can share the terminal bar.

In a sub panel (downstream panel?) separate terminal bars are needed.

Does this apply when the downstream panel is serviced by an SE cable off a breaker (say 100 amps) in the main panel and has it own main breaker (another 100-amps) - in essence, 2 100-amp breakers in series)?

The only place that you can connect the neutrals and the grounding conductors to the same terminal bar is in the service equipment. Your downstream panel must be fed with a cable that has two ungrounded conductor, one grounded conductor (neutral) and an equipment grounding conductor. You must have an isolated terminal bar in the downstream panel for the grounded conductors.

 

[Smart $]

The only place that you can connect the neutrals and the grounding conductors to the same terminal bar is in the service equipment.

While not specifically prohibited, it is not specifically permitted either. There is no Code section which states anything other than EGC's landing on an equipment grounding conductor bus terminal and grounded conductors landing on a grounded conductor bus terminal. In fact, this arrangement must be maintained for a Main Bonding Jumper to exist.

Your downstream panel must be fed with a cable that has two ungrounded conductor, one grounded conductor (neutral) and an equipment grounding conductor. You must have an isolated terminal bar in the downstream panel for the grounded conductors.

This assumes it is not an existing feed to a subpanel in another separate structure. Such a feed was permitted to not have an EGC in lieu of bonding the separate structure's GES to the grounded conductor and equipment grounding system. This practice is no longer permitted, but Code still permits it to be maintained as originally installed.

 

[jap]

In a main panel (I apologize if my terminology is incorrect), bare grounding conductors and grounded neutral conductors can share the terminal bar.

In a sub panel (downstream panel?) separate terminal bars are needed.

Does this apply when the downstream panel is serviced by an SE cable off a breaker (say 100 amps) in the main panel and has it own main breaker (another 100-amps) - in essence, 2 100-amp breakers in series)?

2 breakers in series has nothing to do with where a Grounded and EGC conductor can be landed on the same bar or where they need to be separated.

JAP>