Safety Isolation System
ElectroGuard
Typical Wiring Diagram/Wire Length Considerations
Total W ire Length for Expansion Modules
Typical Wiring Diagram
For North Am erica
Max. Total
For O utside North Am erica
Safety Isolation System
with Optional Fusible
Disconnecting Means
Max. Total
W ire Length
GC
W ire Gauge
W ire Length
40,000 feet
23,000 feet
11,700 feet
W ire Gauge
14AWG
18 Gauge Metric 12,200 meters
14 Gauge Metric 7,000 meters
16AWG
18AWG
Sample Calculation: An application for a 630A Safety Isolation
System will require 8 Remote Lockout Stations (RLS):
1IC 2IC
L1
T1
To Motor
Starters
The wire length from RLS # 1 to the Control Module (in the
ElectroGuard Power Panel) will be 50ft.
L2
L3
T2
T3
To
Loads
The wire length from RLS # 2 to the Control Module will be 200ft.
The wire length from RLS # 3 to the Control Module will be 100ft.
The wire length from RLS # 4 to the Control Module will be 300ft.
The wire length from RLS # 5 to the Control Module will be 500ft.
The wire length from RLS # 6 to the Control Module will be 1000ft.
The wire length from RLS # 7 to the Control Module will be 850ft.
The wire length from RLS # 8 to the Control Module will be 750ft.
Designates
field
connection
points
Remote
Lockout
Station(s)
14AWG wire will be used to connect the RLS to the Control Module
(see illustration below).
Wire Length Considerations
152m
(500ft)
304m
(1000ft)
259m
(850ft)
228m
(750ft)
ATTENTIO N: It is important not to
exceed the maximum wire length values
shown in this section. If the maximum values
are exceeded, this may result in an unreliable
signal to the Safety Isolation System.
Consider using an Expansion Module if wire
lengths greater than those shown for the
Remote Lockout Stations are needed.
RLS
#5
RLS
#4
RLS
#8
Expansion
Module
Each Remote Lockout Station is connected to the Control Module
in the Power Panel of the Safety Isolation System. The total length
of the wire used to connect the Remote Lockout Stations to the
Control Module should not exceed the maximum values shown in
the following tables.
91m (300ft)
30m (100ft)
RLS
#7
RLS
#3
Control
Module
Calculate the total wire length as follows:
RLS
#6
RLS
#1
61m (200ft)
1. Determine the distance in feet or meters from each Remote
Lockout Station to the Control Module (located inside the Safety
Isolation System Power Panel).
2. Sum the distances for all of the Remote Lockout Stations.
3. Double this value.
RLS
#2
Power Panel
15m (50ft)
4. Compare this doubled value with the maximum values for total
wire length shown in the table below:
Analysis: The Control Module furnished with the 630A Safety
Isolation System is capable of supporting a maximum of six (6) RLS.
Since this installation will require eight (8) RLS, an optional 4 port
Expansion Module will also be used. The Expansion Module will be
wired to the Control Module and will take the place of one of the
original six RLS. We will, therefore, plan to wire five (5) of the RLS
directly to the Control Module and three (3) of the RLS to the
Expansion Module. Since the Expansion Module allows greater wire
lengths than the Control Module, we will plan to wire the RLS to be
installed furthest away from the Power Panel to the Expansion
Module.
Total W ire Length for Rem ote Lockout Stations
For Nor th Am erica
Max. Total
For O utside of North Am erica
Max. Total
W ire Gauge
18 Gauge Metric 1,400 meters
14 Gauge Metric 800 meters
W ire Gauge
W ire Length
W ire Length
14AWG
4,600 feet
16AWG
2,600 feet
18AWG
1,300 feet
For RLS # 1: wire length = 50ft x 2 = 100ft
For RLS # 2: wire length = 200ft x 2 = 400ft
For RLS # 3: wire length = 100ft x 2 = 200ft
For RLS # 4: wire length = 300ft x 2 = 600ft
For RLS # 5: wire length = 500ft x 2 = 1000ft
If the application requires a total wire length greater than those
shown in the table, one or more Expansion Modules should be used.
The maximum wire length for the Expansion Modules is shown in
the following table:
12-18
ALLEN-BRADLEY [ Allen-Bradley ]
