SR Products ETL69C-40 Nominal Temperature Rating - Manual (Page 5)

Doc. ETL69C-40-I
9-30-2009
Rev. A
Page 5 of 6
and other Air Handling Spaces,” which requires the use of metallic protection of all
such wiring. Accordingly, the ETL69C-40 attachment end is the same diameter as
½” EMT tubing permitting standard UL listed 3/8” or ½” flex to ½” EMT
connectors to be used together with the appropriate flexible metal conduit to
completely encase the wires within the duct as illustrated in Fig 1. Note that the
flexible conduit should run in a substantially level, straight line with a minimum
length and slack, to either side of the duct, assuring it cannot be trapped under the
damper blades upon closure. Always mount the junction box outside the duct on the
top or either side at a point at or above the level of the ETL69C-40 when mounted
on the damper. Never use rigid or EMT to electrically directly connect to the link
as this may interfere with the mechanical operation.
The ETL69C-40 is typically wired by connecting it to a UL 864 Fire Alarm Control.
The types of systems typically utilize an “end of line” device. This must be wire in
accordance with the alarm system instructions. In normal conditions the alarm
system sends a reversed low voltage signal to the link. The end of line device
allows only a small amount of current through the circuit. The alarm system uses
this signal to supervise the circuit; the voltage is not large enough to operate the
link. During an alarm condition the alarm system uses a forward biased voltage to
the power lead. The end of line device allows this current to pass through the
circuit. Actuating supply current is typically provided by an NEC class 2 low
voltage 24 DC source capable of delivering a minimum of 0.2 ampere (200 mill
amperes) minimum for 50 milliseconds minimum duration to each unit wired to the
system. The product is intended to be connected to power limited circuits.
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