Garage Workshop Electrical Safety

[Electro-tech]

Hi Guys, Original commercial vehicle workshop Installation has old Wylex single phase RCCB units with 2 socket outlets each. Later someone has installed a new 32 A single phase RFC to each workshop. The RCCB unit is fed from a Hager 32A RCBO . So rcd test trips the RCBO, not the RCCB. Both Devices are 30 mA. As each circuit is on different phases, a potential hazard with extension leads or the like brought together could result in 415v. On a EICR how would you code the above? Thanks in advance.

 

[Pete999]

Hi Guys, Original commercial vehicle workshop Installation has old Wylex single phase RCCB units with 2 socket outlets each. Later someone has installed a new 32 A single phase RFC to each workshop. The RCCB unit is fed from a Hager 32A RCBO . So rcd test trips the RCBO, not the RCCB. Both Devices are 30 mA. As each circuit is on different phases, a potential hazard with extension leads or the like brought together could result in 415v. On a EICR how would you code the above? Thanks in advance.

Is the fixed installation up to scratch, does it comply with BS7671? if yes then no code how the client utilises the installation is up to him.

 

[Deleted member 26818]

Sounds like there’s either a lack of discrimination between the RCD and RCCBs, or that the RCCBs are not working.
At best a code C3, at worst a code C2.
How dangerous would it be if someone was using a power tool and the power was cut because someone else caused the RCD to trip?
I would not consider the 415V to be an issue, as there is RCD protection.

 

[davesparks]

The RCCB unit is fed from a Hager 32A RCBO . So rcd test trips the RCBO, not the RCCB. Both Devices are 30 mA. As each circuit is on different phases, a potential hazard with extension leads or the like brought together could result in 415v. On a EICR how would you code the above? Thanks in advance.

Are you saying that you tested the RCBO and RCCB seperately and the RCCB failed or that you tested at the RCBO and it tripped faster than the RCCB? If the second option then it is possible that there is nothing wrong with the RCCB.

There is no need for phase segregation these days, they took it out of the regulations years ago.
For the 415V hazard to occur there would have to be multiple faults present, there would have to be damage to something on both circuits which causes live parts to be exposed to touch and then someone would have to touch the live parts at the same time.