Mmu Cabinet Wiring - Honeywell Multiple Meter Units Installation Instructions Manual

HONEYWELL MULTIPLE METER UNITS (MMU)

6.0 MMU CABINET WIRING

6.1 General Wiring Instructions
Wiring of the individual MMU meters are the same as for a stand-alone meter. See
section 7.0.
Refer to the Individual Meter Installation Manual for individual meter wiring.
M33744
Fig. 4. MMU Terminal.
Some MMU units may come from the factory already pre-wired for the voltage to the
installed meters. When supplied this way, there will be a terminal block located inside
the MMU that is labeled A, B, C, N. See Figure 4. The letters refer to the three phases
and neutral connections already made to the meters. The power only has to be landed
on the terminal block in order to power all of the meters in the MMU.
As with the stand-alone meters, the power wires must be fused. The size of the fuse
will be determined by the number of meters installed in the MMU. The Littelfuse KLDR
series are used for this component. Each meter point requires 1/10 amp fusing. With 8
meters, a one amp fuse would be acceptable.
The current sensor wiring is installed by bringing in the leads from their source and
landing them on the appropriate terminals on the meter's sensor input terminals.
The proper current sensor wiring to each meter is described in each individual Meter
Installation Manual.The MMU style meters are wired the same way, but it is important
that proper routing procedures are followed when the current sensor conductors are
installed.
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