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Wiring the EIA-485 Terminal Block
Wire Chart
Wire Size
Diameter
A.W.G
14
16
18
EIA-485 Shield in Conduit
When the EIA-485 wiring is in conduit, connect the shield to system common.
The shield can enter the cabinet, but must be insulated from the cabinet (no
electrical contact). Between LDMs, wire-nut multiple shields together (which
can be inside of the respective LDM enclosure but ensure that the shield does
not contact earth ground).
EIA-485 Shield Not in Conduit
When the EIA-485 wiring is not in conduit, terminate the shield at the outside
of the FACP cabinet. Do not allow the shield to enter or even touch the cabinet
housing the LDMs. Between LDMs, wire-nut multiple shields together outside
of the respective enclosures. Ensure that the shield does not touch earth ground
at any junction points.
Figure 11 Terminating the Shield with No Conduit
LDM-32F PN 50055:C 03/20/01
Standard Annealed Copper Wire
Cross Section
in Mils
Circ. Mils
64
4110
51
2580
40
1620
Table 1 Wire Specifications
Figure 10 Terminating the Shield in Conduit
Ohms per 1000 feet
Sq. Inch
@ 77°F.
0.00323
2.85
0.00203
4.09
0.00128
6.51
2. Installation
Pounds per
1000 feet
@ 149°F.
2.97
12.4
4.73
7.82
7.51
4.92
T B 2
–
–
+
+
TB 2
–
–
+
+
21
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