Empire
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- Reaction score
- 5
Morning all,
I’m slightly confused with a submain TT out building radial extension.
Earthing arrangement to property is TT
outbuilding has its own local spike and 16mm to submain board.
Zdb to local spike is 6.5 ohms
Pssc of 4mm sub main feed 0.6 ohms
r1+r2 of radial circuits is 0.3 ohms
final Zs of circuits is 14 ohms
performing a 2low Zs produces a satisfactory 7 ohms.
So the issue is the neutral path of the 3low measurement.
does anyone have an explanation please?
I’m slightly confused with a submain TT out building radial extension.
Earthing arrangement to property is TT
outbuilding has its own local spike and 16mm to submain board.
Zdb to local spike is 6.5 ohms
Pssc of 4mm sub main feed 0.6 ohms
r1+r2 of radial circuits is 0.3 ohms
final Zs of circuits is 14 ohms
performing a 2low Zs produces a satisfactory 7 ohms.
So the issue is the neutral path of the 3low measurement.
does anyone have an explanation please?