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Hi everyone and a happy easter!
I don't normally like to post college questions here, coz the whole point is to work them out yourself, but I wondered if you could have a look at my suggested anwer to this one?
Single phase new install. One of the ring final circuits is energised to enable IT equipment testing to be carried out. When connecting a socket to a different circuit (isolated from supply) an electric shock is received when touching phase and cpc conductors at the same time.
Explain why this occured and how it could have been avoided.
From the rest of the assignment, I think we assume that the circuits have all been tested out OK.
My thoughts are that IT equipment can have high cpc currents, so that there could have been current in the cpc and since all cpc's are connected at the fuse board, this could have produced a potential difference between the other socket circuit cpc and phase (at 0v).
To avoid this - disconnect the cpcs of the circuit being worked on from the fuse board but not forgetting to reconnect before energising.
Am I on the right track, do you think?
Hope you can help
SB
I don't normally like to post college questions here, coz the whole point is to work them out yourself, but I wondered if you could have a look at my suggested anwer to this one?
Single phase new install. One of the ring final circuits is energised to enable IT equipment testing to be carried out. When connecting a socket to a different circuit (isolated from supply) an electric shock is received when touching phase and cpc conductors at the same time.
Explain why this occured and how it could have been avoided.
From the rest of the assignment, I think we assume that the circuits have all been tested out OK.
My thoughts are that IT equipment can have high cpc currents, so that there could have been current in the cpc and since all cpc's are connected at the fuse board, this could have produced a potential difference between the other socket circuit cpc and phase (at 0v).
To avoid this - disconnect the cpcs of the circuit being worked on from the fuse board but not forgetting to reconnect before energising.
Am I on the right track, do you think?
Hope you can help
SB