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Main protective bonding
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<blockquote data-quote="Phoenix" data-source="post: 442495" data-attributes="member: 8133"><p>Its too late to visulise properly.....I'll think about that one some ore on the drive to work tommorow ater a sleep!</p><p></p><p>Most times with a dedicated HV trasformer it seems to either be (normal) PNB with the earth electrode at the cutomers end, or in a lot of cases these days, standard TNS wiith a spearate earth all the way back to the transformer enclosure.</p><p></p><p>The one I remember had the customers 400A panel board in the same room as the transformer and HV switchgear (one of those odd arrangements from years ago) The DNO had seen fit to replace the customers padlock with their own and left the customer not able to access their switchgear... a dual access arrangement had to be requested and a lock with a bar that had a diferent padlock each end was fitted.</p><p></p><p>Anyway, I digress, A cable head and CT cab were next to the panelboard. A few metres of 3C waveform came out of the transaformer terminal box and looped around and into the bottom of the head</p></blockquote><p></p>
[QUOTE="Phoenix, post: 442495, member: 8133"] Its too late to visulise properly.....I'll think about that one some ore on the drive to work tommorow ater a sleep! Most times with a dedicated HV trasformer it seems to either be (normal) PNB with the earth electrode at the cutomers end, or in a lot of cases these days, standard TNS wiith a spearate earth all the way back to the transformer enclosure. The one I remember had the customers 400A panel board in the same room as the transformer and HV switchgear (one of those odd arrangements from years ago) The DNO had seen fit to replace the customers padlock with their own and left the customer not able to access their switchgear... a dual access arrangement had to be requested and a lock with a bar that had a diferent padlock each end was fitted. Anyway, I digress, A cable head and CT cab were next to the panelboard. A few metres of 3C waveform came out of the transaformer terminal box and looped around and into the bottom of the head [/QUOTE]
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