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2. INSTALLATION AND WIRING
2.1 Installation
The multiplexer (or terminal board alone) is housed in a Nema 4/4X weatherproof enclosure.
However, it is recommended that additional measures be taken to ensure that water or other
contaminants are prevented from entering and subsequently disrupting operation of the
equipment. For example, in field environments, it could be installed inside an equipment trailer
or shed. The enclosure should be mounted in an upright fashion, i.e. on a wall. The holes located
in the tabs at the top and bottom of the enclosure are used for mounting. Note Figure 9 for
mounting dimensions.
Figure 9 - Multiplexer Enclosure Mounting Dimensions
An earth ground lug is installed on the bottom of the enclosure. Drive a copper stake into the
ground (or use an existing grounded metal structure) and attach a large gauge copper wire (>12
AWG) from earth ground to the earth ground lug of the enclosure.
2.2 Wiring
The enclosure has cable entries for passing the instrument cables to the terminal board. These
entries have seals for specific cable sizes which will minimize the possibility of water or other
contaminants entering the box and causing problems. Plastic dowels are provided for unused
cable entries to prevent moisture and contaminants from entering the enclosure.
If the unit is equipped with manual switching the switch panel must be removed to access the
terminal board. See Appendix C for additional information.
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