Honeywell BC-200 - Addressable Loop Cabling

Appendix
BC-200 Manual – P/N DOC-01-013 102
9
9
.
.
4
4
.
.
2
2
A
A
D
D
D
D
R
R
E
E
S
S
S
S
A
A
B
B
L
L
E
E
L
L
O
O
O
O
P
P
C
C
A
A
B
B
L
L
I
I
N
N
G
G
Applies to:
 Signalling Line Circuit (SLC) loops. Refer to the SLC Wiring Manual for more detailed specifications and
specific device listings.
Requirements:
Recommended
Cable

TWISTED pair, NOT shielded
. The cable should have short overall twist lengths (
8
or
more twists per meter).
Max
distance
Recommended cable type (unshielded):
 *3810 m using 3.25 mm
2
Twisted-unshielded pair
 *3000 m using 2.5 mm
2
Twisted-unshielded pair
 *2000 m using 1.5 mm
2
Twisted-unshielded pair
 *1000 m using 0.75 mm
2
Twisted-unshielded pair
Others:
 1000 m using 0.75 mm
2
, 1500 m using 1.5 to 3.25 mm
2
Twisted-shielded pair
 1000 m using 0.75 mm
2
, 1500 m using 1.5 to 3.25 mm
2
Untwisted-unshielded cable
Maximum
Current
 130 mA: LCM-320
 100 mA: LEM-320
 400 mA max**: Single SLC loop
Maximum
resistance

Maximum
50 ohms
(supervised and power
-
limited).
For more information on installation checks, refer to section 9.6.4.2 Analog Loop Installation
checks and fault finding
Maximum
Capacitance
 Maximum total capacitance for all SLC wiring (both between conductors and from any
conductor to ground) should not exceed 0.5 microfarads
Notes:  Usage of shielded or flat cable for the SLC loops is not recommended and should be
avoided where possible.
 Fire rated cables may be required as per AS1670, AS1668, and AS2118.
 Separate 2 core cable to be run for 24VDC power to FZM-1 and FCM-1 modules
*Max distance of the loop is governed by the total loop resistance and will depend on the type of cable used.
Always check the cable specification to ensure the total loop resistance will be less than 50 ohms for the required
length of cable. A higher resistance than 50 ohms will result in communication problems on the addressable loop.
**Max short circuit…circuit will shut down until short circuit condition is corrected.
Floating Shield
Twisted-unshielded wire is recommended. If twisted-shielded pair wire is installed, use a floating shield to
terminate the wire. The following precautions must be met:
• If the SLC is more than 900 m, divide the shield into floating segments of less than 300 m.
• To divide the shield wire into floating segments, cut shield even with jacket and tape as shown:
NOTE: Using shielded wire in applications where it is not recommended will reduce the maximum SLC length. If
shielded wire must be used where not recommended, failing to float the ends will reduce the maximum SLC
length even further.