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Installation
Connecting the MD-P1 and MD-P1D Power Meters
21
Siemens Industry, Inc.
125-201
09/30/2019
WARNING
USE ONLY SHUNTED CURRENT TRANSFORMERS (CTs). DO NOT USE 5A
SECONDARY CTs OR UNSHUNTED CTs.
Do not use other CTs. Only use shunted CTs with a 333 mV maximum output.
Serious shock hazard and meter damage can occur if unshunted CTs are used.
Use only the following Siemens Industry CTs that are UL listed/Recognized and have
been evaluated to IEC 61010-1. See Figure 7.
14.
Connect electrical power to the power meter's red power connection plugs using 14
AWG THHN (or equivalent) wires, after a building-installed, dedicated circuit
disconnect breaker, as close as possible to the breaker. Mark the breaker as the
disconnect for the meter. See
Wiring Diagrams
for specifics of the wiring
connections.
Follow local electrical codes during this installation.
CAUTION
Do not strap or mount an MD-P1 or MD-P1D Power Meter less than two inches
from current carrying conductors.
The magnetic field around the conductors may affect the electronics in the meter.
The MD-P1 and MD-P1D Power Meters have an internal non-user replaceable 0.5
Amp internal fuse protection.
WARNING
Do not exceed 600 Vac Phase-to-Phase CATIII.
The MD-P1 and MD-P1D Power Meters are rated for measurement category III.
These measurements are performed in the building installation. Examples are
measurements on distribution boards, circuit breakers, wiring including cables,
busbars, junction boxes, switches, socket outlets in a fixed installation, and
equipment for industrial use. Other equipment could include stationary meters with a
permanent connection to the fixed installation.