MV Cable crossing other cables

[kenaslan]

I have an MC-HL 4160V cable leaving a Trenwa trench passing across some 480V MC-HL cables at a right angle. The4160C cable is aprox 8" from the 480V cables. Does anyone see a code violation with this installation?

Thanks.
Ken

 

[GoldDigger]

Is the 4160 shielded?

 

[ron]

I do not recall any code leading to a violation from NEC 225

 

[Smart $]

Is the 4160 shielded?

They'd have to be if in the same raceway. Otherwise would require a barrier... and that barrier would have to be "extended" through where they crossover.

 

[kenaslan]

Thank you for all your help.

392.20. Cable and Conductor Installation. (B)
Cables Rated Over 600 Volts.
Cables with insulation rated 600 volts or less may be
installed with cables rated over 600 volts if either of the
following provisions are met.

No. 1:
Where the cables over 600 volts are Type MC

As both cables are MC-HL no barrier is required

 

[ron]

Thank you for all your help.

392.20. Cable and Conductor Installation. (B)
Cables Rated Over 600 Volts.
Cables with insulation rated 600 volts or less may be
installed with cables rated over 600 volts if either of the
following provisions are met.

No. 1:
Where the cables over 600 volts are Type MC

As both cables are MC-HL no barrier is required

392 is Cable Trays. I thought this was an outside underground question since you referenced a Trenwa trench, which I've seen as precast concrete trenches.

 

[don_resqcapt19]

392 is Cable Trays. I thought this was an outside underground question since you referenced a Trenwa trench, which I've seen as precast concrete trenches.

Since there are no actual rules that cover the use of concrete trenches, some AHJs apply the cable tray rules.

 

[Smart $]

Since there are no actual rules that cover the use of concrete trenches, some AHJs apply the cable tray rules.

At least none that seem to apply to outside installations... inside, it'd fall under 390.

There's also 300.3(C) Conductors of Different Systems....

(2) Over 1000 Volts, Nominal. Conductors of circuits
rated over 1000 volts, nominal, shall not occupy the same
equipment wiring enclosure, cable, or raceway with conductors
of circuits rated 1000 volts, nominal, or less unless
otherwise permitted in 300.3(C)(2)(a) through (C)(2)(d).

(a) Primary leads of electric-discharge lamp ballasts insulated​

for the primary voltage of the ballast, where contained​

within the individual wiring enclosure, shall be permitted​

to occupy the same luminaire, sign, or outline​

lighting enclosure as the branch-circuit conductors.​

(b) Excitation, control, relay, and ammeter conductors​

used in connection with any individual motor or starter​

shall be permitted to occupy the same enclosure as the​

motor-circuit conductors.​

(c) In motors, transformers, switchgear, switchboards,​

control assemblies, and similar equipment, conductors of​

different voltage ratings shall be permitted.​

(d) 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.