CHAPTER 2: INSTALLATION
WIRING
EPM 4
5
00 SUB METER – INSTRUCTION MANUAL
2–9
2.2.5
Three-Phase, Three-Wire Delta Wiring
The phase association and polarity of the current transformers must be followed or the
meter will not be correctly installed.
1. Current transformers must be in-phase with the reference voltage. The MCI
board runs in an A-C phase rotation (see table below) and every two CT connec-
tions repeat an A-C order.
For example, a current transformer installed in-phase with reference voltage A must
be installed on CT1, CT3, CT5, etc. Current transformers installed in-phase with
reference voltage C must be installed on CT2, CT4, CT6, etc.
2. For the “C” or commercial 3-phase/3-wire model, each A-C combination is a
single meter point (see the table below for full listing). That is,
– Meter 1 (M#1) is CT1 and CT2
– Meter 2 (M#2) is CT3 and CT4
– Repeated for M#3 to M#12
3. After completing all current transformer terminations, connect four (4) current
connectors and then remove the twenty-four (24) shorting links.
4. Follow all local codes for installation requirements; e.g. conduit, fused
disconnect, distance, and wiring.
5. Installation of “L” (0.1 A inputs) and “H” (CL10 or 5 A inputs) are the same.
If breakers are energized, shorting links must be installed before:
1.
disconnecting the CT headers
2.
replacing or installing meter heads on the panel.
Bodily injury may result if shorting links are not installed!
