I have just been involved in a situation where temporary loss of neutral on a TNCS system caused thousands of pounds worth of damage. It seems this loss of neutral situation, either within or outside the installation, is occurring more frequently. SPDs are now commonly fitted but at DBS and generally with a Up in the order of 860v, so giving no protection on loss of neutral in a three-phase and neutral system. Cost benefit analysis across the national spectrum might not support a compulsion but is it time designers should be raising the issue with clients and at least offering a solution. On the other hand, is there a packaged solution?
Thanks map1. When it comes to safety I try to steer clear of sophistication, though it does well as a backup. I was thinking of single phase TNCS. With the arrangement I had in mind, the earth side of the caps would have to go to a separate earth rod for the tripping purpose, because the normal earth connections voltage would rise up,
Thanks map1. When it comes to safety I try to steer clear of sophistication, though it does well as a backup. I was thinking of single phase TNCS. With the arrangement I had in mind, the earth side of the caps would have to go to a separate earth rod for the tripping purpose, because the normal earth connections voltage would rise up,
