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Hi Alec, Thanks for the reply. Yeah, it makes sense being Part 1. I suppose in practice its not so simple making the whole installation HRW due to being non-MEN, just for the fact that in mining the use of alternative earth system is common place and there are lots of additional standard to ensure s...

Hi Guys, I have a question WRT alternative supply system to MEN (TNCS), in mining operation we often use the IT earth system. To be specific the current mine site the 11KV used on site is supplied via Isolation transformer (5.5MVA), the secondary side has a resistor connected between the star point ...

Hey, Had this exact situation few months ago, but with three transformers, with three main switches, two bus ties between each "section" of the board all on to one switchboard. N + E bar common across all three boards, and it also had generator supply as well. Each incomer had a MEN link, meaning th...

Hey just out of curiosity what's the clause for the use of single insulated wiring? Trying to find it.

3000 3.10.1.1 Exceptions says single insulation is ok or is it 3012?

Thanks Alec / Pete for the responses.

So same applies to VIR /TRS also as long as electrically safe?

However prudent to replace.

Hey Team, Was just a job the other day a saw some oldish TPS which was solid core 2.5mm primary insulation on the earth as well, not bare earth in sheath. What date did the standards prevented the uses of solid core cable other than 1mm? Just want to get a better upstanding of when types of cable we...

In a symmetrical earth design cable the earth conductors are located in the interces between the phase conductors. This ensures the distance between the phase conductors and earth is consistent. The resultant earth currents now cancel each other out minimizing the common mode current that can flow b...

Evening all, The question is mainly directed at the industrial side of the house. Currently working on a large industrial construction job. The plant is of foreign design and they have sent over a large commissioning team from that country. What are everyone's thoughts or feelings and the legality o...

What type of cable is everyone running between in a new build? Cat5e and fibre composite? Or are you just running duct? I have a long run in a new built to do, no access from etp to opt or data panel once lined. Bit of a mission running 20m of conduit through framing for chours too pull the cable, w...

Hi all, Just doing some personal development in this period of down time. I don’t have much experience in dealing with residential network connections and/ or power providers so bear with me if the following seem like stupid questions. I am in the Auckland area and was looking into the vector connec...