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Swimmer
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Discussion Starter · #1 · (Edited)
1. Which article best spells out that ground is connected to neutral in only one place, e.g. not in sub-panels?

The best I've seen so far are 250.24(A)(5) and 250.142(A) Now I understand why so many installers get this wrong.

2. Is a typical residential service a separately derived system? I'm thinking yes because:
A: The same system bonding rules apply
B: There is no physical connection between neutral input / output at the transformer on the utility pole.
 

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2A- The rules are close, but aren’t the same.

2B- The neutral connections are together on the pole mounted transformers I’ve seen.
 
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Art 230 is on services & SDSs have their own definition.

SDSs can be

1) stepdown xfmrs (not services),

2) UPSs,

3) generators

(all three depending on how they're wired).
 
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