Ground wire at medium voltage rating

[anbm]

Is green insulated or bare equipment ground wire available at medium voltage rating, i.e. 15KV, 25KV as it has at 600V or less?

 

[electrofelon]

Is green insulated or bare equipment ground wire available at medium voltage rating, i.e. 15KV, 25KV as it has at 600V or less?

No, it would serve no purpose. Even the neutral on an MGN system only needs a 600v rated conductor. The EGC does not need a voltage rating at all. Actually 2kv PV wire is available in green.....about the stupidest thing I've ever heard of, but they do make it and I have been forced to use it. I almost said "fine I'll do it, but only if I first go get a t-shirt made I can wear that says this is stupid I am only doing it because I have to"

 

[ggunn]

No, it would serve no purpose. Even the neutral on an MGN system only needs a 600v rated conductor. The EGC does not need a voltage rating at all. Actually 2kv PV wire is available in green.....about the stupidest thing I've ever heard of, but they do make it and I have been forced to use it. I almost said "fine I'll do it, but only if I first go get a t-shirt made I can wear that says this is stupid I am only doing it because I have to"

I feel your pain. I once had an inspector tell me that an EGC can be bare, but if it is insulated the rating on the insulation has to be as high as that of the highest rated CCC. <slaps forehead>

 

[JoeStillman]

Is green insulated or bare equipment ground wire available at medium voltage rating, i.e. 15KV, 25KV as it has at 600V or less?

I don't think you need one if you are using concentric neutral cable. But with tape shields, it's recommended. Concentric "neutrals" aren't current carrying conductors unless you're feeding a wye-connected primary somewhere - very unusual below 34 kV in my experience. They get grounded at both ends, whether the transformer has a neutral point or not.

 

[electrofelon]

Concentric "neutrals" aren't current carrying conductors unless you're feeding a wye-connected primary somewhere - very unusual below 34 kV in my experience. They get grounded at both ends, whether the transformer has a neutral point or not.

Very common in my experience - if it's an MGN system, the transformer primary will be wye. Can't recall ever seeing a POCO feed a Delta primary from an MGN system.

 

[jim dungar]

Very common in my experience - if it's an MGN system, the transformer primary will be wye. Can't recall ever seeing a POCO feed a Delta primary from an MGN system.

Except when they plan to upgrade the system. for one customer their MV transformers were ordered as being reconnectable from delta to wye, when the POCO finally upgraded all we had to do was resize the fuses and change the PTs on their MV power monitoring equipment.