1 2 3 4
5
6 7 8 9 10
11 12
13 14 15 16
NOT USED
LOOP 1
LOOP 2
++
+
+
+
+
+
++
+
+
-
-
-
-
-
-
--
-
-
-
++
--
MOM-4
TB 1
TB 2
INITIATING
DEVICE
INITIATING DEVICE
CLASS B WIRING **
T-TAPPING ALLOWED
CLASS A WIRING *
NO T-TAPPING ALLOWED
EITHER LOOP MAY BE WIRED AS
CLASS A OR CLASS B
NO END OF LINE DEVICE REQUIRED
BOTH CIRCUITS SUPERVISED AND
POWER LIMITED PER NEC 760
Electrical ratings:
Supervisory 30 VDC peak
66mA max
Alarm 30 VDC peak
66mA max
(60 devices in alarm)
All wiring must be in accordance with
Article 760 of NEC and the local
building codes.
ALD-2I Connections and Ratings
4 - 3
ALD-2I Wiring
NOTES
1. Power limited to
NFPA 70 per NEC 760.
2. Minimum wire size:
18 AWG.
3. Maximum resistance:
100 ohms total.
4. Maximum
capacitance:
0.4µF between
+ loop and î˜ loop.
0.8µF between
+ loop and chassis.
0.8µF between
î˜ loop and chassis.
5. Each detector or group
of detectors, requires a
two-wire circuit of
thermo-plastic fixture
wire enclosed in
conduit or limited
energy shielded cable
without conduit, if
permitted by local
building codes.
6. No end of line device
required.
7. Operates in full
conformance with
Style 6.
8. Operates in full
conformance with
Style 4.
9. Either loop may be
wired Class A or B.
10. 60 devices maximum
per loop.
11. T-tapping is NOT
allowed on Class A
loops.
12. Both circuits are
supervised.
Only the devices listed in Appendix A,
Table 2 - Analog Addressable Detec-
tors on page A-1 may be used. The UL
identifiers for compatibility are the same
as the model names specified.
See Note 8.
See Notes 7 and 11.
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