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Procedure 2-8 How to Connect the RTU to Main Power Source (Units with Housing)
1) Using a screwdriver, open the power junction box cover (save the screws) and unscrew the
power terminals screws inside the power junction box.
2) Insert the rubber grommet (supplied) into the threaded plastic cable gland, and place it into
the hole on the bottom of the housing (from the outside.) (See Figure 2-22.)
3) Place the nut into the same hole from inside the housing and screw the nut onto the cable
gland. (See Figure 2-22.)
4) Thread the user's main power cable (110/220VAC or 24-48VDC) through the cable gland
cover from below, through the cable gland, and into the housing. (See Figure 2-22.)
Cable
Gland
Cover
Figure 2-22 RTU in NEMA 4 Housing – Cable Gland Anchor Point 2
5) Attach the wires of the user cable, according to labels (~/0 for AC and +/- for DC.) See
Figure 2-20 and Figure 2-21. For the No I/O frame, connect the ground cable to the lower
wire terminals (third pair).
6) Tighten the screws of the wire terminals and screw the wire terminals onto the junction
box.
7) Pass the power cable into the right side of the junction box, over the horizontal ridge.
8) Place the user cable into the clamp, close the clamp and screw it onto the junction box, into
the hole next to wire terminals (anchor point #1).
9) Replace the junction box cover over the junction box.
RTU Housing
Cable
Gland
Grommet
2-18
Installation
Nut
Power
Cable
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