Discuss Disconnection Time for IT system in the UK Electrical Forum area at ElectriciansForums.net
Also, would it be to much to ask for a pic of the table regarding distributed and none distributed neutrals?
The problem is after the 1st fault you might have 133V to earth (if N-E faulted) or you might have 230V to earth (if either of L1-L3 are faulted).So basically TN vs IT? I can't picture at 133/230Y TN system needing the same disconection time as 230 volt IT. Both are none distributed neutral systems.
Right, but picture a 133/230Y TN system. Highest voltage to earth will be 133 volts no matter the network conditions.
1st fault/2nd fault | N | L1 | L2 | L3 |
N | 0 | 230 | 230 | 230 |
L1 | 230 | 0 | 400 | 400 |
L3 | 230 | 400 | 0 | 400 |
L3 | 230 | 400 | 400 | 0 |
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