RKI Instruments 65-2481RK - Manual (Page 15)

65-2481RK Multi Point Detector • 11
Wiring the Multi-Point Detector to a Controller
WARNING: Always verify that the power source is OFF before you make wiring
connections.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover from the top junction box.
WARNING: To maintain the explosion proof classification of the multi-point detector,
a conduit seal must be used within 18 inches of the junction box conduit
hub used for wiring to the controller.
4. Guide a ten-conductor, shielded cable, or ten wires in conduit through the top conduit
hub of the junction box. Use appropriate conduit fittings and construction technique
for the environmental rating and hazardous location classification of the junction box.
The junction box is rated NEMA 4X and classified explosion proof for Class I, Groups
B, C, and D.
5. Connect the wires to the multi-point detector using the terminal blocks in the top
junction box.
CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the multi-
point detector. You will connect the opposite end of the cable’s drain wire at the
controller.
6. Secure the junction box cover to the junction box.
7. Route the cable or wires leading from the multi-point detector through one of the
conduit hubs at the controller housing. Use appropriate conduit fittings and
construction technique for the environmental rating of the controller. RKI controllers
are typically rated NEMA 4X.
CAUTION: Do not route power and multi-point detector wiring through the same conduit hub.
The power cable may disrupt the transmission of the detector signal to the controller.
8. Connect the wires to the applicable controller terminal strips. See the controller
operator’s manual and the controller’s detector head specification sheet. Also see
Figure 8-Figure 9 for wiring diagrams for each detector model.