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- RSM-5c and RSM-5 Installation -
Chapter 2
It is recommended that the RSM-5c and RSM-5 meters be mounted on
a concrete wall with the appropriate screws long enough to hold the box
in place. If the only choice is to mount the meter on a drywall or plaster
wall, make sure that the boxes are properly screwed on the studs of the
wall.
2. Mount the RSM-5c or RSM-5 back box to the wall, with mouting screws.
Connect the distribution panel box to the RSM-5c or RSM-5 back box
with a metal conduit. This conduit will be used for the voltage taps and
current transformer (CT) secondary wiring. There will be between 2 and
4 #12AWG wires in this conduit, connected to the hot line(s) and neutral
(if present). There will also be between 2 and 6 #16 AWG stranded wires
connected to the CT secondary wiring. The conduit should be sized to
accommodate this.
3. The RSM-5c or RSM-5 metal boxes must be grounded. Either a ground
wire may be run and attached to one of the box mounting screws, or the
boxes may be grounded by the conduit.
4. Securely fasten one end of the grounding wire so that the screw cuts the
paint on the back box. Securely fasten the other end of the wire to true
earth ground connection. When grounding to the electrical conduit, use
continuous pipes, bending when necessary instead of using couplers.
Step 2: Connect voltage taps
Power must be off when connecting these wires!
1. Locate the incoming feeder phase (hot) wires in the distribution panel.
Tape the incoming feeder wires with colored electrical tape according to
phase, for identification purposes.
2. Tap the feeder wires with #12 AWG stranded wires. The color of the
insulation on these wires must match the color of the tape on the feeder
wire to which they are connected. If neutral is required, tap the neutral
connection with a #12 AWG stranded wire with white insulation. These
voltage connections can be made in any way that meets local codes and
requirements.
A service disconnect switch for the hot wires is required. It is
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2008
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recommended that the disconnect switch should be placed as near as
possible to the meter. If fused, no less than a 15-A fast-acting fuse must
be used.
3. Run the #12 AWG feeder phase tap wires through the conduit to the back
box.
Step 3: Install and connect Current Transformers (CTs)
Power must be off when connecting these wires!
Un-terminated CT secondary wires will produce hazardous electrical
potentials if any current is flowing through the CT. While connecting the
CTs, POWER MUST BE OFF until the CTs have all been connected to the
fuse block.
1. Each CT is supplied with two secondary wires. One wire is colored black,
red, or blue, and the other wire is white. Connect these 2 wires to the
screw terminals on the fuse block.
2. If the wires that are supplied with the CTs are too short to reach the fuse
block screw terminals, they must be extended. Extend the CT wires with
#16 AWG stranded wire. This should be black, red, or blue wire to match
the existing CT wire. Extend the white wire of each CT with a white
wire. It is very important to maintain the association of a particular CT's
secondary wires. One must keep track of which white wire goes with each
individual colored wire. It may be helpful to tape them together before
pulling them through the conduit.
Wire color coding may vary depending on local codes and regulatory
standards within certain jurisdictions.
3. Locate the branch circuit that supplies current from the distribution panel
to the metered load. Disconnect these wires one (or two) at a time and
properly run each wire (or pair of wires) through a CT as shown in Figure
2-1. The colors of the CT leads must correspond to the color of the tape
on the phase feeder wires that supply this load.
© COPYRIGHT
2008
- RSM-5c and RSM-5 Installation -
Chapter 2
www.quadlogic.com
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