HP Metal Jet S100 User Manual page 90

5. Once the engine's computer is off, test that the RCCB works correctly by pressing the test button.
● If the RCCB does not trip when the test button is pressed, this indicates that it has failed. The
RCCB must be replaced for safety reasons; call your service representative to remove and
replace the RCCB.
● If the RCCB trips, this indicates it is working correctly; reset the RCCB to its normal on state
and complete the check for all the RCCBs.
6. Close the electrical cabinet door, by ensuring the switch bar is inserted into the handle, then use
the service key to lock it.
Check the earthing
Check that the resistance between specific parts and the building's earth is less than 1 Ω.
Safety warnings
86 Chapter 4 Maintenance