Installation 2-17
3300 ACM Installation and Operation Manual Power Measurement Ltd.
2.9 FIELD SERVICE
CONSIDERATIONS
In the unlikely event that the 3300 ACM unit should fail,
servicing will require disconnection and removal of the unit
from its mounting for the purpose of repair, or for exchange
with a replacement unit. The initial installation should be
done in a way which makes this as convenient as possible:
1. All phase voltage sense leads should be protected by
breakers or fuses at their source such that the 3300
ACM can be safely disconnected.
DANGER
PT secondary circuits are capable of
generating lethal voltages and
currents with their primary circuit
energized. Standard safety precau-
tions should be followed while
performing any installation or service
on the device (e.g. removing PT fuses,
etc.)
2. A CT shorting block should be provided so that the
3300 ACM current inputs can be safely disconnected
without open circuiting the CTs. The shorting block
should be wired so that protective relaying is not
affected.
DANGER
CT secondary circuits are capable of
generating lethal voltages and
currents when open circuited with
their primary circuit energized.
Standard safety precautions should
be followed while performing any
installation or service on the device
(e.g. shorting CT secondaries, etc.)
3. All wiring should be routed to allow easy removal of the
connections to the 3300 ACM base module terminal
strips and the 3300 ACM itself.
Questions regarding proper working procedures should be
referred to qualified personnel.
Courtesy of NationalSwitchgear.com
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