SEC clamps/raceways/grounding bushing confusion...

Specific Inspection Topics Electrical Inspections
1

Hey folks,
Been trying to figure out when a grounding bushing is required. Here in DC, most residences don’t use any type of raceway/metal conduit between the meter and electrical panel, and secure the SECs with a standard clamp/locknut.

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However, often the SECs are behind drywall and I can’t verify it’s just using a clamp/locknut, and not a metal raceway. Should I recommend a grounding bushing be installed (given that not all the concentric knockouts are used)?

My understanding is that the grounding bushing is required only when there’s a metal raceway.

Thanks!
–Matt

2

Are you asking about a SE cable connector? They do not require any type of bushing.

3

Service entrance conductors should not be in the walls. Services need to be as short as practical. Feeders can be concealed.

4

I guess I’m referring to the feeders where they enter the main electrical panel in the house.