Garage board

[Ajf100q]

Hi. When certifying a small 2 way garage board.
Do I carry out ze at the origin of supply or should I record a zs db reading in the garage?
Same question regarding the fault current and short circuit current aswell should it be taken from garage or origin of supply?

 

[Ian1981]

Both, record the Ze at the origin and the Zs of the distribution circuit installed, likewise with the PFC.

 

[Julie.]

You have two boards:
The main cu in the house, the test results for this should use Ze as its the origin of the supply (and the fault level there), one of the outgoing circuits will be the feed to the garage so would calculate the Zs worst case for that circuit (and/or measure) using Ze plus r1+r2 for that circuit

The garage board, the test results for this would use the Zs as calculated and/or measured for the starting Zs(db) at that board (and the fault level there), the outgoing circuits would use the Zs(db) plus r1+r2 for each circuit