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So the Ze with earth electrode disconnected is about 7.6 ohms and then zs with it connected, i would expect a similar value to the ze reading, however lets say i have a zs value of  say 6 ohms, then surely the pfc = U0/zs = 650v / 6 = 108A which would not be enough to clear trip the MCCB or blow...

I realise i am going to regret this and look a little bit of an idiot, but if the gen star point is bonded to true earth, then that is a TNS ? it then has ONLY 2 50mm^"2 LINE and NEUTRAL conductors to the outbuilding, where the outbuilding is only bonded to ground via 4 earth electrode rods. I...

the generator is bonded to true earth by two 16mm electrodes and the earth electrode is connected to the neutral star point so the source is a TNS. it is just how to go about proving that sufficient current will flow to cause a large enough current to take out the generator fuses or MCCB...

This a rail installation, and i know that rail are exempt from BS7671, however it will be classified as a static unit and will not go into traffic, so the installation is the same as connecting to a mobile static unit and the public will be using the facility so it comes under BS7671 from my...

Hello, I have got myself confused with testing a generator installation. The generator is A 100kVA 650Vac single phase machine.  The generator is bonded down to true earth via two 16mm - 4ft earth electrodes, and then bonded to the neutral star point of the machine. to create a TNS. The...

well as i have to have two posts before i can view anything which is crazy this is my second :)

Don't rely on the books olci give you and as they are rubbish... buy trever linsley's level 2 and 3 for