5kV Teck 90 Cable in Rigid Steel Conduit 1

[sonic02]

Hi there,

We are planning to install a 5kV TECK 90 Cable buried in a cable trench. One of the client requirements is that any cables buried in a cable trench in a vehicular area needs to be installed in a rigid steel conduit.

Now, my question is whether a 5kV TECK 90 cable can be installed in a rigid steel conduit underground. Is this a common practise among industrial clients?

I was told that the 5kV TECK 90 cable can be damaged during cable pulling if installed in a conduit.

Comments anyone?

Thanks in advance.

 

[dpc]

Not sure where you are at, but in the US, MC cable such as Okonite C-L-X can be pulled in conduit.

I would not say it is common, but it is sometimes done. Just mind the bending radius.

David Castor

http://www.cvoes.com

 

[waross]

Any cable may be damaged by being pulled into a conduit by poor workmanship.
Teck cable is generally installed in conduit to provide extra mechanical protection.
Consider bell ends on the conduit instead of bushings. Beware of dirt and stones entering the conduit with the Teck cable.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[rcw retired EE]

Is your TECK 5 kV cable three conductor or single conductor? 1/C cable will need all three phases pulled in the same conduit to avoid heating of the conduit.

 

[sonic02]

Hi rcwilson,

It is a 5kV TECK 90 3C-500MCM Non-Shielded cable. This cable has a total diameter of 2.78 inches (including the outer jacket). My concern is the cable bending of that cable in a rigid steel conduit underground (i.e. buried trench).

 

[waross]

How long is the conduit and how many quarter bends? What is the bend radius?

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[dpc]

Use a big conduit and big radius bends. The electricians will complain, but they'd complain regardless.

If you want more guidance on design on the conduit system, I'd contact your local Okonite office. They like to find ways for people to use more C-L-X so are generally helpful. (No affiliation.)



David Castor

http://www.cvoes.com

 

[wareagle]

I think NEC 310 requires 2000 volt cable and up to be shielded.
I do not have my book with me. Maybe someone can verify this.

 

[dpc]

wareagle,

Since "Teck Cable" is a CSA spec, I'm assuming this work is in Canada.



David Castor

http://www.cvoes.com