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Topic Title: ct coil wiring
Topic Summary: Best way
Created On: 22 April 2013 10:29 AM
Status: Read Only
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 22 April 2013 10:29 AM
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Posts: 166
Joined: 23 December 2006

Hi All, got a job to change some meters on some dbs we installed last year . The meters need to be changed as the BMS contractors network does not accept a pulse signal . and the meters we fitted dont provide any other options .

My question is , on the meters wiring diagram it shows 6 conductors 2 per CT and at the meter end shows one of these connected to earth. The existing CTS have been wired as a 4 wire system using a common earth to one side of each of the three coils then 1 conductor per phase taken to the meter plus the common earth.

What is the recognised way to wire these CT coils ?

 22 April 2013 11:06 AM
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Posts: 22467
Joined: 23 March 2004

Both sides of the CT coils usually go to the meters (in and out) plus one side of each CT is earthed to provide the meter neutral conection.

I'd start by installing a proper test block with shorting links - try here and then follow the meter/ct instructions.



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