Figure 1.3-1
10 TM1700-SERIES ZP-BL16E BL1448GE
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 instrument to station earth
(ground) and the other end of the conductor to the
terminal on instrument marked
This connection must be done before any test cables
and the mains supply cable are connected to instru-
ment 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 instrument
to a High-Voltage Circuit Breaker, make sure the
breaker is closed and earthed (grounded) on both
sides according 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 instrument shall only be supplied by power ac-
cording to the specifications stated at the mains inlet
on instrument.
Always connect the instrument to a power outlet
with protective ground.
Mains supply - Protective earth (ground)
Dangerous voltage may be present in systems that are
earthed separately.
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