Vaults with 5kv feeder and 480v Lighting

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RJorg

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In a vault (4x4) there is a 5kv circuits (4c 1/0 EPR) spliceing with no open connections. Is it permissable to put a 480v lighting circuit in this vault? Any clearance restrictions? What code section would best address this?
 
RJorg said:
In a vault (4x4) there is a 5kv circuits (4c 1/0 EPR) spliceing with no open connections. Is it permissable to put a 480v lighting circuit in this vault? Any clearance restrictions? What code section would best address this?
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NEC 210.6.C
 
RJorg said:
In a vault (4x4) there is a 5kv circuits (4c 1/0 EPR) spliceing with no open connections. Is it permissable to put a 480v lighting circuit in this vault? Any clearance restrictions? What code section would best address this?
Click to expand...

Article 300.3(C)2(E) explains the requirements for putting the two systems in the same manhole.

(2) Over 600 Volts, Nominal. Conductors of circuits rated over 600 volts, nominal, shall not occupy the same equipment wiring enclosure, cable, or raceway with conductors of circuits rated 600 volts, nominal, or less unless otherwise permitted in (C)(2)(a) through (C)(2)(e).

(e) In manholes, if the conductors of each system are permanently and effectively separated from the conductors of the other systems and securely fastened to racks, insulators, or other approved supports, conductors of different voltage ratings shall be permitted.
Conductors having nonshielded insulation and operating at different voltage levels shall not occupy the same enclosure, cable, or raceway.
 
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