TT installation - Why is there a minimum size requirement for earth conductors?
TT installation - Why is there a minimum size requirement for earth conductors?
Discussing some work with an electrician including upgrading the tails from 16mm2 to 25mm2
We are on a TT system. All circuits are protected by 30mA/30ms RCBO or RCD as well as 100mA/100ms Type S as the main switch on the CU.
He said that the cable going to the earthing point needed to be increased in CSA.
That got me thinking - Why is there a minimum size requirement for any of the earth conductors? What fault condition could cause more than 100mA to flow down any cable for more than a...
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by a546345
This has been automatically posted in the DIYNot Forum on DIY Talk. The new DIY Forum
TT installation - Why is there a minimum size requirement for earth conductors?
Discussing some work with an electrician including upgrading the tails from 16mm2 to 25mm2
We are on a TT system. All circuits are protected by 30mA/30ms RCBO or RCD as well as 100mA/100ms Type S as the main switch on the CU.
He said that the cable going to the earthing point needed to be increased in CSA.
That got me thinking - Why is there a minimum size requirement for any of the earth conductors? What fault condition could cause more than 100mA to flow down any cable for more than a...
Read more
by a546345
This has been automatically posted in the DIYNot Forum on DIY Talk. The new DIY Forum