MK:440 Environmental Noise Microphone
Page 8 of 13
6.3
Installation and wiring
The MK:440 must be wired in accordance with the National Electric code (NFPA 70) or the Canadian
Electric Code (CSA C22.1). An installation drawing below shows the electrical connections to be
made to the device, note that the power and loop signals can come from a combination of non-
hazardous and hazardous locations as long as it is suitably rated.
Wherever possible the MK:440 should be wired outside of any potentially explosive atmosphere. A
single conductor must be used in each port.
The cross-sectional area of the conductor must be between 0.2mm
2
and 0.6mm
2
. The cable must
have a temperature rating of at least 80°C and ideally be UL rated. The power and current loop
supply must be connected as follows:
There must be no conductor extending beyond the terminal block, strip wires no more than 10mm.
+24V (Power)
+24V (Loopout)
0V (GND)
+24V (Loopin)