Megger TM1800, User Manual

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Figure 1.3-1
12
TM1800 ZP-CG01E CG0757JE
1 SAFETy
1.3 Protective earthing
procedure in HV
environments
IMPORTANT
Protective earth (ground)
Connect the clamp of the yellow/green protective
conductor supplied with TM1800 to station earth
(ground) and the other end of the conductor to the
terminal on TM1800 marked
This connection must be done before any test cables
and the mains supply cable are connected to TM1800
and this connection shall be the last connection
removed.
The earthing (grounding) is needed since induced cur-
rent from the High-Voltage Circuit Breaker can cause
hazardous voltages. See Figure 1.3-1.
Preparation of the circuit breaker
Before connecting or disconnecting the TM1800 to a
High-Voltage Circuit Breaker, make sure the breaker is
closed and earthed (grounded) on both sides accord-
ing to local safety regulations.
Connection of test cables to the circuit
breaker
All connections and disconnections of cables at the
Circuit Breaker shall be done while the breaker is
closed and grounded on both sides according to local
safety regulations.
Mains supply - Voltage
The TM1800 shall only be supplied by power accord-
ing to the specifications stated at the mains inlet on
TM1800.
Always connect the TM1800 to a power outlet with
protective ground.
Mains supply - Protective earth (ground)
Dangerous voltage may be present in systems that are
earthed separately.