EPS IPES-IR3 - Earth Grounding; Cable Conductor Size and Length

820-0003
IPES IR3 Flame Detector
Operating Manual
Page 17 of 37
Earth Grounding
The enclosure of the IPES‐IR3 must be earthed/grounded for electrical safety and to limit the effects of radio
frequency interference. An earth/ground point is provided on the outside of the IPES‐IR3 Explosion Proof
enclosure.
Use 14 AWG copper (Stranded, or Solid), wire.
Loosen the nut sufficiently to enable wrapping of the wire or wire terminated with a crimped lug around the
thread in a “U” shape. Raise the flat and lock washers and position the wire between the 2 flat washers and
ground base.
*Note: Earth and System Grounds are separated to prevent ground loop potential plus maintain signal and
current output integrity
Power Cable Conductor Size affects Cable Length
The IPES‐IR3 detector must receive a nominal voltage of 24 VDC (+/‐ 8VDC) to operate properly. Wire size
requirements are dependent upon power supply voltage and wire length.
There are several possible methods to electrically connect an IPES‐IR3 that are determined by each user’s
application.
These can run from a single IPES‐IR3 running on 24VDC that is operating as an isolated device and is connected
directly to a warning system of alarms and/or lights to a network of devices that are connected in series that can
provide any mix of RS‐485 Modbus, +4 to 20 am, and relays to separate devices.
22 AWG 0.326mm
2
)
40.5Ω
750
2460
20 AWG 0.518mm
2
)
40.8
1200
3936
18 AWG 0.823mm
2
)
40.7Ω
1900
6232
16 AWG (1.31mm
2
)
40.2Ω
3000
9840