User's Manual

MTU Installation Requirements 21
W IRING
MTUs are provided with a standard cable length of 12 feet. MTU cables are 22
AWG, solid copper wires with UV resistant insulation jacket. All wiring must be
consistent with the wiring provided with the MTU and adhere to local and national
codes.
Cable Insulation
Most MTUs are shipped with black cable insulation. Dual port MTUs, however
will have two cables: one with black insulation and one with gray insulation. The
black inulated cable is for port 1, and the gray insulated cable is for port 2.
Wire Length
If necessary, additional wire may be used to extend the range between the meter
and the MTU up to 100 feet. (Some meters allow up to 500 feet of wire. Please
refer to the meter manufacturer’s documentation for exact limitations.) Always use
cable of with 22 AWG solid copper conductors, with the same insulation color
coding when extending the wiring.
Wire Routing
All wiring must be secured every 18 inches and before and after every change in
direction. Wiring routed along wood or drywall must be secured with 9/16"
rounded-crown staples. Wiring routed along masonry walls must be secured using
appropriate wire clips. If necessary, nylon cable ties may be used to aid cable
routing in interior environments. The MTU cable must allowed to move slightly
within the staples, wire clips, or ties.
All changes in wire direction must only be made at right angles. Wiring must run
parallel to ceiling joists, when possible. If joists must be crossed, the wiring must
cross the joists at right angles.
If wire clearance holes are needed to route wire from the meter to the MTU, use a
¼" drill bit. The installer is responsible for the selection of an appropriate location
for any hole to be drilled.
DRAFT