Section 3. ET Instrumentation Installation

b)Shut off 110 VAC power at the main breaker. Connect the primary leads of the transformer to 110 VAC following instructions provided with the transformer. Connect a two-conductor cable to the secondary terminals of the transformer. Route the cable from the transformer to the ET Enclosure according to local electrical codes.

3.1.4Enclosure Installation

1.Mount and ground the ET enclosure on the ET Tower as shown in Figure 3.1-4.

a)Place the enclosure low on the tower. Do not tighten clamps.

b)Install the sensor arm (ET106) or reduced sensor set as described in Section 4.

9-inch

Ground

Wire

Tower

Ground

Wire

FIGURE 3.1-4. Mounting and Grounding the ET Enclosure

c)Slide the enclosure to the top of the ET tower. Position it on the north side of the tower (northern hemisphere). The top of the enclosure should be flush with the top of the tower, with the width of the sensor arm extending above the tower. Tighten the clamps until the enclosure is snug. Do not over-tighten since doing so may damage the tower or enclosure.

d)Carefully mount the lightning rod and clamp to the top of the ET Tower. Clearance between the clamp and the enclosure is minimal. Care should be taken not to scratch the enclosure or sensor assembly. Strip 1 inch of insulation from the top end of the 12 AWG green tower ground wire, curl the end and place the curled end under the head of one of the lightning rod clamp bolts. Tighten the bolt.

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