Ground Conductor - 15kV Tape Shield
Ground Conductor - 15kV Tape Shield
(OP)
I have seen a number of installs of 15kV cable with a grounded tape shield on each conductor. In all of these installs, there is not a separate ground conductor pulled through the conduit.
On a new job, the engineer is calling for a separate ground wire. Can someone point me to the relevant code section?
It's not a big deal to pull the ground wire - I'm just curious to understand the proper way to do this...
Thanks!
- Chris
On a new job, the engineer is calling for a separate ground wire. Can someone point me to the relevant code section?
It's not a big deal to pull the ground wire - I'm just curious to understand the proper way to do this...
Thanks!
- Chris






RE: Ground Conductor - 15kV Tape Shield
is more than permitted according to cable tray cross section area [see NEC Table 392.60A] a Grounding cable has to run
through the cable tray according to Table 250.122.
RE: Ground Conductor - 15kV Tape Shield
RE: Ground Conductor - 15kV Tape Shield
RE: Ground Conductor - 15kV Tape Shield
The steel rigid conduit -according to NEC- it is a suitable mean to carry any current to Ground but the flexible does not. So you need -any way- a grounding cable from the rigid conduit to terminal box.
You could have a similar problem at the other end so you would prefer a grounding conductor along the entire length parallel
to the cable. If the cable enter the conduit from a cable tray you have to check if the cable tray can support the fault current.
IEEE Std 575 ch. 5.4.3 Parallel Ground Continuity Conductor states that
a parallel ground continuity conductor close to the shielded cable will reduce the magnetic field produce by other conductors carrying the short-circuit to Ground.
conveying the return current to Ground. This conductor may be a steel rigid conduit-of course.