the transformers I have installed all passed inspection. On most instalation we use Teck Cable as a feed from the splice box connected to the main disconnect. On the Teck we strip the outer jacket so that the dry connector grips the aluminum sheeting. I would say the alluminum sheeting on the Teck Cable is bonded and protected by the dry connector connected to the transformer casing. The cable also has a ground wire inside. Does anyone use ground bushing on the dry conector that brings the Teck Cable in the transformer?
bonding Teck armor
- Thread starter ianis
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Minuteman
Senior Member
- Location
- The Sooner Nation
ianis, where are you located. Your terms are a little different than I am used to. Could this Teck cable be Flexible Metal Conduit?
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barbeer
Senior Member
- Location
- Pinellas County, FL
Is this the "TECH cable you are using? Looks pretty bulletproof, I have never used it.
http://www.nexans.ca/egy/equip/teck90/firex.html
From what you are describing- service entrance? I would bond the metallic sheathing.
http://www.nexans.ca/egy/equip/teck90/firex.html
From what you are describing- service entrance? I would bond the metallic sheathing.
micromind
Senior Member
- Location
- Fernley, NV. (near Reno)
I've installed miles of TEK cable in power plants. The stuff we use is basically explosion proof MC cable. It looks alot like regular MC cable, but it has paper or plastic twine fillers packed tightly in the space between the wires, and a plastic/rubber outer jacket. When used with proper connectors it's listed for class1/div1 locations.
I've seen it with up to 35 #14's, 3/750MCM (about 4" OD, VERY hard to bend), and 3/500MCM 35KV (about 5 1/2" OD and doesn't really bend at all!). Always with a ground wire inside. The 3 wire types have 3 grounds.
To terminate it, you strip the outer jacket, then cut the armor off about 1" to 3" longer depending on the size. The connector has compressible spring inside that clamps around the armor, and a rubber sleeve (alot like a cord grip) that seals around the outer jacket. I've never used a bushing of any sort with it, by its nature it's pretty hard to get the wires to touch the inside throat of the connector.
I've seen it with up to 35 #14's, 3/750MCM (about 4" OD, VERY hard to bend), and 3/500MCM 35KV (about 5 1/2" OD and doesn't really bend at all!). Always with a ground wire inside. The 3 wire types have 3 grounds.
To terminate it, you strip the outer jacket, then cut the armor off about 1" to 3" longer depending on the size. The connector has compressible spring inside that clamps around the armor, and a rubber sleeve (alot like a cord grip) that seals around the outer jacket. I've never used a bushing of any sort with it, by its nature it's pretty hard to get the wires to touch the inside throat of the connector.
weressl
Esteemed Member
ianis said:
When used with connectors designated and UL listed for TECK Cable, the connector and its connection to the body that it connects to is tested for SC carying capability and listed and approved for that purpose.
TECK cable is a CSA term and it is NOT recognized nor approved for Class I, Division 1 location as per the NEC.
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