Causes of Spasmodic RCD Tripping
RCDs

List of Possible Causes which may be Responsible for Spasmodic RCD Tripping

INCOMING
(non-protected 'upstream' of RCD)
Loose connections
Mains borne disturbance (effect worse off load)
exceeding EMC Std. EN50082-1
Site machinery/plant
Installed services
Lightning strike
etc....

OUTGOING

Protected 'downstream' side
Mains borne (effect worse off load) exceeding EMC Std. EN50082-1

Wrongly Specified
Incorrect applications
No discrimination between RCDs
Crossed Neutral on split load
N to E fault on non PME (trips)
N to E fault on PME (no trip)
High standing earth leakage
Appliances and installed services		 Loose connections
Wet plaster
Condensation (ie behind appliances)
Mineral insulated conductors
Heating elements (new or old)
Householder faults (picture hooks etc)
Moisture ingress (appliance sockets etc)
etc.


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