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Bonding overall power cable shield

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Isaiah

Senior Member
Location
Baton Rouge
Occupation
Electrical Inspector
They mistakenly ran a SHIELDED 480V 3/C 4/0 power cable w/ground to a vendor supplied panel from about 800 feet away. They don’t want to to replace the cable but the question becomes what to do with overall shield?
To avoid circulating voltage I’d bond it at the source end only and leave it floating at the vendor panel. Any thoughts?
 
D

Dale001289

Senior Member
Location
Georgia
Grounding a shield at both ends eliminates the capacitive coupling problem; the ground loop currents will be small provided the shield is terminated properly.
 
A

alexfox1986

Member
Location
Manchester
Occupation
Electrical Engineer
Hi Isaiah!

In general, the overall shield of a power cable is typically connected to ground at both ends of the cable to provide a low-impedance path for any induced current to flow to ground. However, in your specific case, you mentioned that you want to avoid circulating voltage, which could occur if the overall shield is grounded at both ends.

Bonding the overall shield at the source end only and leaving it floating at the vendor panel may be a reasonable solution in this situation. By doing so, you would be effectively grounding the shield at only one end, which can help to prevent circulating voltage. However, it's important to note that this approach may not be ideal for every situation, and there may be other factors to consider, such as safety requirements or local electrical codes.
 
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