Tunnel Master® wbc Installation Guide
Page 6
Tunnel Master® wbc Installation Guide
Page 6
Tighten all wires on the circuit board terminal blocks to 15 inch-pounds. Over-torquing may
cause breakage.
High-voltage (AC) and low-voltage (DC) must not be combined in a common conduit,
junction box, or wire trough.
Power cables and comm cables must not be combined in a common conduit, junction box,
or wire trough.
Site Grounding Considerations
The Tunnel Master® wbc and peripheral equipment must be properly grounded.
Recommended and Accepted Grounding Methods
Proper system grounding is an extremely important part of the system installation. Grounds for
all system devices should be wired to the breaker panel ground bus bar which, in turn, should
be grounded to a ground rod. A conduit ground does not provide a sufficient ground. It is
recommended that the neutral and ground bus bars be bonded together when it is not prohibited
by local codes.
The universal ground symbol identifies the grounding lug connector located inside the lower-right
corner of the Tunnel Master® wbc box.
WARNING: Improper grounding will void equipment warranty.
Ground wire must be connected to the ground lug. Failure to
properly ground the unit could result in unit failure and/or bodily
injury.
Wire Gauge and Conduit Size
When planning the orientation of the wiring runs, follow the applicable ICS wiring diagrams and
consider the layout of the components at the site.
To determine conduit size needed, see the table below for more information.
½
¾
1
1 ¼
1 ½
2
2 ½
3
AWG 14
13
24
39
69
94
154
—
—
AWG 12
10
18
29
51
70
114
164
—
AWG 10
6
11
18
32
44
73
104
160
AWG 8
3
5
9
16
22
36
51
79
AWG 6
1
2
6
11
15
26
37
57
AWG 4
1
1
4
7
9
16
22
35
AWG 3
1
1
3
6
8
13
19
29
AWG 2
1
1
3
5
7
11
16
25
AWG 1
1
1
1
3
5
8
12
18
Table 3. Wire Gauge and Conduit Size
