Article 225.39B SErvice with no more than two, two-wire circuits 30A minimum.

[bullheimer]

Okay, so really, i run across this article way more than i should and still don't know anything.

i want to run a 120v ckt and a hot/hot/ground ckt to a 240V ckt, to a metal conex trailer on the ground.

dont want the ground rods. (but will a ground wire satify the code?) i can run the five wires to the building because the load is under 30A. the inspector i explained this to, said the two wires, the hot/neut 120V goes to a snap switch for light and outlets d/c, and the two hots to a two pole breaker d/c. but no load center because then i would need a 60A sub for the possibility someone might add a circuit.

so will this let me out of the ground rod requirements? my insp said yes, as long as two disconnects. but isnt it required to have a single disconnect on a building? and i would obviously have to ground a metal building, right?

anybody ever done this? i also got another customer wants two 120V circuits to a detached garage. same thing.
would appreciate any help.

 

[bullheimer]

dont have to have just one d/c as long as they are grouped together. but does this sound kosher to yu all? seems like the code lets you take two twowire ckts as that's the neame of the paragraph.

 

[infinity]

You need to comply with this section first:

II. Buildings or Other Structures Supplied by a
Feeder(s) or Branch Circuit(s)
225.30 Number of Supplies. A building or other structure
that is served by a branch circuit or feeder on the load side
of a service disconnecting means shall be supplied by only
one feeder or branch circuit unless permitted in 225.30(A)
through (E). For the purpose of this section, a multiwire
branch circuit shall be considered a single circuit.
Where a branch circuit or feeder originates in these
additional buildings or other structures, only one feeder or
branch circuit shall be permitted to supply power back to
the original building or structure, unless permitted in
225.30(A) through (E).
For the purpose of this section, a multiwire branch cir-
cuit shall be considered a single circuit

 

[bullheimer]

a multi wire ckt might be considered a single ckt, but it is not a two-wire ckt. however, mine is, two hots. no Neut.

and there wont be anything going back to the original building at all.

Further, 225.30. D: will let me do this for:
"Different characteristics (different voltages)."