dormakaba 1856 HT SD, 1856 SFT SD Installation Instructions
08220880
03-2020
1800 Closer
13
Wiring
Wire gauge: The maximum wire gauge for wiring the SD-2 detector module is #18 AWG. The method for
determining wire gauge is given below. NOTE: A minimum of 20.4 VDC must be supplied to each solenoid in
the run.
Power
Supply
No. of
solenoid
(S1)
No. of
solenoid
(S2)
No. of
solenoid
(S3)
No. of
solenoid
(S4)
Wire length
to S1
(D1)
Wire length
to S2
(D2)
Wire length
to S3
(D3)
Wire length
to S4
(D4)
To next hold open
solenoid
S1, S2, S3, etc. are the number of solenoids at each subsequent station. D1 is the distance from the power
supply to the first solenoid station. D2, D3, D4, etc. are the distances from the previous solenoid station to
the next solenoid station in the run. To the determine the correct wire gauge multiply S1 times D1. Add that
quantity to S2 times D2. Repeat the same procedure for each solenoid to test the last unit in the run.
Compare the quantity calculated to the chart below. The calculated value must be less than or equal to the
value corresponding to the appropriate wire gauge.
10 GAUGE-11,788 12 GAUGE-7,407 14 GAUGE-4,669 16 GAUGE-2,997 18-GAUGE-1,843
The procedure described above can be expressed in the following equation: (S1xD1) + (S2xD2) + (S3xD3)
......(SnxDn). The above values correspond to the wire gauge to be used. If the calculated value 1,843 #18
AWG wire can be run and connected directly to the detector module. If the calculated value exceeds 1,843
larger wiring will be required. Since the detector will only accept #18 AWG wire, a wiring splice will be
necessary as illustrated below.
SD-2
NOTE:
For ULC installations, 18
gauge wire is required to detector.
#18
13
12
1
8
2
9
10
3
4
5
6
7
15
14
11
#18
#16 - #12
#16 - #12
#16 - #12
#16 - #12
4.6 Wire gauge
Fig.15
