Trying to add Garage consumer unit and having an issue I was hoping for direction on. Previously garage feed was from house consumer unit via garage RCBO to socket in the garage with no problems. Was looking to get some lights & extra socket so purchased garage consumer unit kit so can have light and socket circuits and tidy the whole thing up.
So have connected exiting armoured cable and new garage consumer unit, so the new run which consists of below:
From house to garage
-------------------------------
House CU via Garage RCBO = 20A-30mA
Armored Cable 2.5mm 3 Core
Garage CU via RCD 40A-30mA
Garage CU via MCB 32A
Garage 2.5 Twin & Core to single socket
Problem
---------
1: Socket tester powers ok & shows as "correct" with expected voltage readout.
2: Socket tester RCD test button trips the garage RCD.
3: However, if I plug any load in it trips the "House garage RCBO only."
So looking for any advice on what could cause this? Nothing changed on the house side, and everything worked when was just armoured cable to the socket so am hoping its a relatively straight forward solution.
Was actually wondering if the trip was being caused by the lower-rated house garage RCBO which is 20A? Was looking to swap it out anyway to match both sides but could this also possibly be the root cause of the tripping?
Have provided some pics FYI and thanks in advance for any advice given...
So have connected exiting armoured cable and new garage consumer unit, so the new run which consists of below:
From house to garage
-------------------------------
House CU via Garage RCBO = 20A-30mA
Armored Cable 2.5mm 3 Core
Garage CU via RCD 40A-30mA
Garage CU via MCB 32A
Garage 2.5 Twin & Core to single socket
Problem
---------
1: Socket tester powers ok & shows as "correct" with expected voltage readout.
2: Socket tester RCD test button trips the garage RCD.
3: However, if I plug any load in it trips the "House garage RCBO only."
So looking for any advice on what could cause this? Nothing changed on the house side, and everything worked when was just armoured cable to the socket so am hoping its a relatively straight forward solution.
Was actually wondering if the trip was being caused by the lower-rated house garage RCBO which is 20A? Was looking to swap it out anyway to match both sides but could this also possibly be the root cause of the tripping?
Have provided some pics FYI and thanks in advance for any advice given...