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Appendix D
–
Using the Model 118 ITM in the European Community
25
Appendix D – Using the Model 118 ITM in the European
Community
9.1. Installation
The Model 118 ITM is intended to mount inside the customer’s panel, enclosure, or to be
otherwise protected so that only the face of the instrument is accessible to the operator.
There are potentially hazardous voltages (mains) on the rear terminals of the unit.
The mains supply power to both the Model 118 ITM and the cooling FANs for the customer’s
transformer. The wire size required for mains wiring is dependent on the FAN current and
must be determined by the customer.
The user must supply appropriate anchorage for the mains wiring.
The Model 118 ITM is designed to be installed in Installation Category III per EN 61010-1
(low voltage directive).
A terminal connected to the Model 118 ITM chassis is provided as TB1-11. This provides
the means to connect the Model 118 ITM front panel to the grounding system of the cabinet
or enclosure.
To meet the requirements of the EN 61010-1 paragraph 6.12.2.1:
A switch or circuit breaker must be provided to control power to the unit.
It shall be in close proximity to the unit and within easy reach of the operator.
It shall be marked as the disconnecting device for the equipment.
Radio Frequency interference above Level 1 of EN 61000-4-6
conducted
on the mains
wiring may affect the reading of the Model 118 ITM. This is a very unlikely type of
interference in the usual environment of the Model 118 ITM. In the event that this type of
interference is present, an RF filter needs to be applied to the mains wiring external to the
Model 118 ITM.
The Model 118 ITM is immune to
radiated
Radio Frequency interference such as that
caused by hand-held radio transmitters or cellular telephones.
