EPM 4500 SUB METER – INSTRUCTION MANUAL
WIRING
CHAPTER 2: INSTALLATION
2-3
Table 2–1: Wiring Diagram / Model Reference
Section
Three-Phase Four-Wire Wye Wiring
on page 2–3
Single-Phase, Three-Wire 120 V Wiring
on page 2–6
Three-Phase, Three-Wire Delta Wiring
on page 2–9
Single-Phase, Three-Wire Wiring
on page 2–12
2.2.3 Three-Phase Four-Wire Wye 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-B-C phase rotation (see table below) and each of the three CT
connections repeat an A-B-C order.
For example, a current transformer installed in-phase with reference voltage A must
be installed on CT1, CT4, CT7, etc. Current transformers installed in-phase with
reference voltage B must be installed on CT2, CT5, CT8, etc. Likewise, current
transformers installed in-phase with reference voltage C must be installed on CT3,
CT6, CT9, etc.
2. For the “C” or commercial 3-phase/4-wire model, each A-B-C combination is a single
meter point (see the following table for full listing). That is,
3. – Meter 1 (M#1) is CT1, CT2, and CT3
– Meter 2 (M#2) is CT4, CT5, and CT6
– Repeated for M#3 to M#8
4. After completing all current transformer terminations, connect four (4) current
connectors and then remove the twenty-four (24) shorting links.
5. Follow all local codes for installation requirements; e.g. conduit, fused disconnect,
distance, and wiring.
6. Installation of “L” (0.1 A inputs) and “H” (CL10 or 5A inputs) are the same. For 6 point
models, use meter points M#1 to M#6; M#7 and M#8 are not functional.
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!
