Three story dwelling unit

[Ponchik]

Based on 215.18 (2023NEC)

A three story single family dwelling with one sub panel at each floor, needs one 10KA rated SPD for each sub panel.

Am I interpreting that correctly?

 

[Dennis Alwon]

The sub panels don't need a main breaker in them. The breaker at the main panel, where they are fed, is all that is needed

 

[augie47]

Based on 215.18 (2023NEC)

A three story single family dwelling with one sub panel at each floor, needs one 10KA rated SPD for each sub panel.

Am I interpreting that correctly?

If I'm reading 215.18 correctly, yes.

 

[curt swartz]

I know some bay area inspectors are saying once CA starts using the 2023 NEC they are going to require all panels to have SPD's

215.18 states that feeders that supply dwelling units require SPD's. It doesn't say that all feeders supplying loads in dwelling units. To me if a feeder is supplying a dwelling it must meet the definition of a dwelling.

3 bedrooms and 2 bathrooms is not a dwelling unit.
A kitchen, family room, bathroom and foyer is not a dwelling unit.
A garage and laundry room is not a dwelling unit.

 

[jaggedben]

On a single family dwelling unit if there is an SPD at the service then none are required at subpanels. Number of stories is irrelevant.

 

[herding_cats]

You are using "main lug" subpanels. No DC required.