Wavecom TNT+, Instruction Manual

Page: 26 / 36

Page 26
Chapter 3 – TnT+ Portable Appliance
Test Instructions
RCD TEST
Menu 2
NOTE: Where
ANY RCD testing, is to be carried out 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 trip current tests on any down stream (portable) RCD
devices, the RCD in the switchboard will 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 can 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 RCD isolation transformer be used. (TnT-ISOT) These are designed
specifically for the purposes of field RCD tripping.
DO NOT use these Transformers for any other purpose.
Ratings 240v in 240v Out @ 30VA Fuse protected Primary winding 500ma
To perform RCD tests the TnT+ supply lead needs to be plugged in to the RCD device to
be trip tested. For tripping switchboard mounted (Fixed) RCDs Plug TnT+ into GPO
marked RCD protected or if known to be protected circuit. (Diagram 2)
If testing portable RCD devices on power boards or extension leads plug TnT+ into power
board or lead (recommend Isolation transformer) Diagram 1
Isolation
Transformer
Wall
GPO
May be
RCD
protected
Portable
RCD
Xlead
Socket
TnT+ Plug
TnT+
DIAGRAM 1