What kind of cable is this?

[480sparky]

Imagine all the digital channels I'll get!

And there still won't be anything on!

 

[Ken 6789]

Why does the primary cable have a neutral? I thought the neutral is always picked up on the xfmr this cable feeds.

 

[zog]

Has that changed? The information I have is:

LV = Voltage levels that are less than or equal to 1 kV

MV = Voltage levels that are greater than 1 kV, but less than or equal to 69 kV

HV = Voltage levels that are greater than 69 kV, but less than or equal to 230 kV

EHV = Voltage levels that are greater than 230 kV, but less than or equal to 800 kV

UHV = Voltage levels that are greater than 800 kV

I agree that this is probably medium voltage cable. I would guess that it is #2 Al. 15 kV GRD Y XLPE (it has a translucent look to it) with either a full or 1/3 size concentric neutral and a PE jacket.

Nope, you are right >1000V-69kV, not >600V-69kV for MV. It does look like XLPE or TR-XLPE, cant really tell from that picture, too dark.

 

[zog]

Thanks everyone, yea I knew it was a high-voltage cable but was unsure what the outer conductors were used for.

But it is not, it is Medium Voltage cable, not high voltage.

 

[LarryFine]

Why does the primary cable have a neutral? I thought the neutral is always picked up on the xfmr this cable feeds.

Like what we do, the neutral should parallel the line conductor. Remember, a transformer primary needs two conductors, too.

 

[charlie]

Like what we do, the neutral should parallel the line conductor. Remember, a transformer primary needs two conductors, too.

We also use the neutral for grounding. We don't depend on just the ground rod (sound familiar to anyone?) for grounding equipment.

 

[sb1975]

Yea its TRXLP, Here's a pic of the side. Hope you can see it...

 

[dbuckley]

Just a note about concentric cable; it is used when the neutral conductor is a combined neutral and ground conductor to try and prevent a shock hazard. The logic is that you cant disconnect the neutral through cable damage or failure and still have the hot connected.

Edited to note: when I say "prevent a shock hazard" I don't mean to the person trying to cut the cable, but rather to the load supplied by the cable, the cable construction is intended to ensure that the grounds at the load dont float to line potential.

 

[charlie]

Just a note about concentric cable; it is used when the neutral conductor is a combined neutral and ground conductor to try and prevent a shock hazard. The logic is that you cant disconnect the neutral through cable damage or failure and still have the hot connected.

It works very well when the guy on the backhoe is trying to dig through the cable. The cable will also pull the elbows off if he is close to deadfront equipment.