Wavecom TnP-500 - RCD Tests (Menu B - F3); RCD Testing Preparation; Understanding RCD Types; RCD Test Setup Procedures

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TnP-500 User Manual Wavecom
RCD Tests – Time Test / Ramp Test– Menu B – F3
Before Testing
When any RCD testing is to be carried out on any circuit that is protected by an RCD in the main switchboard
(upstream), it’s most likely to trip this upstream RCD. When performing RCD Trip Time or Ramp current tests on
any portable RCD devices, the RCD in the switchboard may trip faster. This is due to increased upstream levels
of leakage current from the additional circuits and devices connected to it. The fixed RCD’s may also have
better connectivity, sensitivity and mechanical mechanisms.
To avoid tripping large areas in the work place monitored by the switchboard RCD it is suggested that an
Isolation Transformer be used. Wavecom offer an Isolation Transformer, designed specifically for the purposes
of field RCD tripping. Do not use these transformers for any other purpose. Rated 240VAC In, 240VAC Out @
30VA. Fuse protected, Primary Winding 500mA.
Types of RCD
There are two types of RCD - Type 1 and Type 2:
Type 1 - Has a trip time of < 40mS and a trip current of < 10mA. These types of RCD’s are mainly used on sites
containing medical equipment. These types of RCD’s must be compliant with the AS3551 standard. (Please refer
to AS3551 for specific guidance)
Type 2- Has a trip time of < 300mS and a trip current of < 30mA. This is the default setting on all new units.
Unless specified on the RCD device, nearly all RCD will be this type, however as with all electrical testing, take
care to confirm the RCD type before testing.
RCD Testing Setup
When testing RCDs, different kinds of RCDs will require different test setups. Consult the diagrams below to
determine which setup is required for your situation. Note the presence of the Isolation Transformer between
the Portable RCDs and the GPO. This ensures any switchboard RCDs are not tripped when testing Portable
RCDs.
Testing Fixed RCDs
Connect Blue Power Cable from
TnP-500 IEC Power Socket directly to
GPO.
Testing Portable RCDs with
no physical switch
Connect in series:
Blue Power Cable from TnP-500 IEC Power
Socket to RCD, to Isolation Transformer,
to GPO
Testing Portable RCDs
with physical switches
Connect in series:
Blue Power Cable from TnP-500 IEC Power
Socket to RCD, to Isolation Transformer, to
GPO.
Ensure the RCD socket is switched on.
Repeat for each outlet on RCD.