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I have come across this very type of thing in the past. The first one was where a pillar was removed and the mains were extended into the LV Cubicle of the TX that supplied the Pillar. The Lines company did all of the work but still required the customer to pay for an Inspection of the Mains work. A...

There is no logical electrical reason to trefoil single core N/S cables. The magnetic fields of these currents are cancelled by the neutral screen.

I am not sure why I included upgrades from SERF’s to MCB’s as general work. Must have been having a senior moment.

There are two dwellings sharing the mains but as far as the rules go they are one installation. There are high level definitions of an Installation in several Acts that cover electricity supply in NZ. If there is only one point of supply then there is only one installation as far as Section 162 of t...

As long as the replacement doesn’t add anything more to the installation then it is Repairs / Maintainence of an existing installation and therefore low Risk. So an ESC is all that is required. If you add things to an installation it is general risk work. Ie: more things, circuits, RCD protection, U...

If you extend a compliant circuit then the whole circuit must comply with the new rules. Your second to last paragraph pretty much answers your question. It is not acceptable for the finished work to comply with some but not all requirements. Sometimes it is easier to run a new circuit and leave the...

I have no idea. I work in the metering industry so bypass the retailer and have access direct to the Data Administrators who read the meters. They provide us the data on an as required basis for sites that have a downgraded metering Category due to historic maximum demand, just to confirm that they ...

If the installation is a commercial CT metered site you can ask the retailer to provide a demand report. It will typically give you information about the largest usage in any 1/2 hour period over a 12 month time frame. A bit of maths after that and you have actual real world figures to work with. Th...