Can an upstream fault cause an RCBO to trip?

[LlandrilloSpark]

Fellas

Scenario - 1 main three phase board feeding 3 further three phase boards with each of those feeding 15 single phase boards containing only two final circuits each.

The fault is on the final circuits, ive tested the final circuits and all clear, can a fault on the distribution circuits upstream cause the RCBO to operate?

cheers

 

[LlandrilloSpark]

Nick the Coffee machine is situated in reception and was £2 a pop.......no chance!!