current transformer installation

[buck33k]

One of the utilities in our area left us current transformers with instructions to just bolt them to the back of the ct can (no mounting bracket). They are the donut type without the bar and so no provisions for lugs. The ct can feeds two service panels so there will have to be some connections made inside the can besides the neutrals. I suppose they will simply splice the service lateral and service entrance conductors when the time comes.
My limited experience with cts has them mounted on brackets with lugs or studs provided for lugs, but once again I don't have a great deal of experience with this and have never worked with this utility. I will go to their meter shop Monday to make sure I understand correctly.
Is this something you see commonly?
Buck

[ January 07, 2006, 01:35 PM: Message edited by: buck33k ]

 

[templdl]

Re: current transformer installation

Who made the CTs? I know that the ones that I used to sell had mounting brackets as an option. The kit consisted of (2) L shaped brackets.
You could probably make some out of aluminum angle stock that would have width enough to reach 2 mounting holes of the CT and provide a wide enough base to facten to the panel. Making your own may be a lot less time than messing around trying to get someone to understand what you are talking about and then ordering and shipping them.

 

[buck33k]

Re: current transformer installation

templdl
Thanks for the responce. I will look Monday for the manufacturer. There was a bag of hardware which I thought contained the cover handles only but could include the brackets you mentioned. I'll double check with the utility to make sure I'm on track.
Thanks
Buck

 

[rick hart]

Re: current transformer installation

The "donuts" that I have seen were always installed by and where the utility wanted them. All they wanted was a piece of 3/4" plywood in the back. If they want you to hang them, I'm sure they have some specifics of how they want them.
As long as all of the appropriate phase conductors all go through the same phase CT, and there are no splices BEFORE passing through the CT, they probably won't care.

Just the same visiting their meter shop is a good idea.

 

[tom baker]

Re: current transformer installation

We used to install 3/4" pywood on the back of a CT cabinet, but now the CR cabient has a bracket that is installed, 2 hole nema studs are provided for your lugs. After all is inspected the POCO metering dept installs, wires and then seals the CT cabinet.
This type of meter can is made by Circle AW, now owned by B-Line.