Installation
February 2011 2-40 P/N 06-237041-001
2-8.7.2.2 R-NAC Circuits for Series-Wired Initiator Assemblies
Figure 2-33 shows series-wired initiators connected to a releasing circuit. Each releasing circuit is
capable of either one of the following two arrangements: Power Limited or Non-Power-Limited. The
compatible initiator assemblies are listed in Appendix C, List of Agency Listed Compatible Devices
Initiators must not be mixed together on the same release circuit. A releasing circuit is supervised
and non-power-limited when used with series-wired initiators. Initiators can also be power limited
when the in-line device, P/N 06-220023-001, is wired in series with the initiator assemblies.
Note: Route non-power-limited wiring at least 1/4 inch away from all power-limited wiring. Place
non-power-limited wiring inside a conduit.
Note: Choose compensating resistor so that total initiator-circuit resistance is 10 ohms +
1 ohm.
Use resistor rated for 1/2 watt. Contact Fenwal Technical Support for information about
ordering the correct compensating resistor. For power limited configuration, measure total
initiator-circuit resistance before in-line device is installed.
WARNING
Initiator assemblies are Class-C explosives. Always use safety glasses or a face shield when
handling them. Do not remove the shorting cap from the initiator assembly until the
assembly is installed in the agent-storage container. Physical abuse or static-electricity
discharge could cause inadvertent initiator actuation and personnel injury. The installer
must establish a common electrical potential with the initiator assembly and the agent-
storage container before either removing or inserting the shorting cap.
WARNING
Do not measure the total resistance of the initiator circuit with any instrument other than
a blasting galvanometer or similar device with a maximum current output of 50 mA. Do
not use a megohmeter with a current output greater than 50 mA to check the initiator-
circuit wiring for low impedance paths to earth ground.
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