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The installation of the M1550 shall comply with all local and national re and electrical codes,
i.e. NFPA 70, National Electric Code. In order to provide proper re and electrical shock pro-
tection, the M1550 shall be powered from an isolated power source, use 14 AWG supply wiring
provided with an 8A over current protection fuse. The fuse shall be located at the secondary
of the source to properly protect the power supply secondary conductors.
Field wiring should use 60°C copper conductors. The pluggable terminal blocks will accept
12-26 AWG wire. The wire should be stripped 0.310” and the terminal block tightened to the
recommended torque, 0.79 N-m (7.0 lb-in.) Use appropriate gauge wire for the control circuit
loads. Minimum 22 AWG wire is recommended for the Discrete Inputs. Minimum 22 AWG,
twisted, shielded wire is recommended for the Analog Inputs and Analog Outputs. 14 AWG
wire is recommended for the Discrete (Relay) Outputs. DC control signals should be segre-
gated from AC power and AC control wiring by using separate wire ducts and separate con-
duit.
The M1550 is an open type device that requires an appropriate enclosure, suitable to the instal-
lation site. The surrounding air temperature of the M1550 should not exceed 50°C (122°F).
M1550 Installation Requirements
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