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Hi can anybody help? my central heating system has been making strange banging noises for a little while now and i'm not sure what it is. I have recently done a power flush through the system as i was advised that this would solve the problem, however it hasn't and the banging noise has...

I am a little confused about the Zs values. Example: A TN-S system supplies a 32A type B 60898 c/b. The Zs for this must be no more then 1.44 Ohms. However my book also states that the maximum earth fault loop impedance for a TN-S system should not exceed 0.8 Ohms. Can some one help me with this?

I am installing a new consumer unit in a 1970’s house and need to extend the existing gas and water bonding conductors. Am i right to say that i can simply extend the bonding conductors with connector blocks providing the maximum permitted resistance of each bonding conductor does not exceed...