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?
very few single phase loads will be damaged by 190V for a short period, and such a brown out may be quite common during the start up inrush of motors or other heavy loads on a system already close to the 207V or so that would be the long term permitted minimum of 230V +/-10%.
If you set the limit too close, then all sorts of innocent events will trip it off.
very few single phase loads will be damaged by 190V for a short period, and such a brown out may be quite common during the start up inrush of motors or other heavy loads on a system already close to the 207V or so that would be the long term permitted minimum of 230V +/-10%.
If you set the limit too close, then all sorts of innocent events will trip it off.
