Cable Management - GE Legend Installation Manual

Cable management

Follow all local codes for cable management. As a general rule, you can fill a cable conduit to a maximum of
60% of its capacity. You must maintain 40% free space. A variety of factors will determine how many cables
you can run into the dome. Capacity limitations include:
• number of cables
• size of the cables
• number of alarms and relays wired
• use of single-conductor or multiple-conductor cable
• use or lack of use of a junction box
Figure 3 provides an illustration of the cable capacity of three typical applications. It is important to note that
all cables of the same gauge are not of the same diameter. Manufacturer, shielding, and rating affect the actual
diameter of cables of the same gauge. GE leaves the selection of the appropriate cable to the discretion of the
installer who is working with the local codes of the installation site.
Figure 3. Three acceptable typical cabling scenarios
3/4 in. dia.
3/4in. dia.
Video
Video
Includes:
• Video: one 59U/6U coaxial (0.24 in. dia.)
• Data: two 20 AWG UTP (0.19 in. dia.)
• Power: one 18 AWG UTP (0.21 in. dia.)
• Ethernet: none
• Alarms: none
• Relays: none
Percentage conduit fill = 31%
Note: The diameters for cables of the same gauge will vary per manufacturer, rating, and shielding. So be aware that
you may get more or fewer cables within the 60% conduit fill requirement depending on the cables that you select.
3/4 in. dia.
3/4in. dia.
Video
Video
Power
Power
Data
Data
(daisy chained)
(daisy chained)
Data
Data
(daisy chained)
(daisy chained)
Includes:
• Video: one 59U/6U coaxial (0.24 in. dia.)
• Data: two 20 AWG UTP (0.19 in. dia.)
• Power: one 16 AWG UTP (0.25 in. dia.)
• Ethernet: CAT-5 (0.16 in. dia.)
• Alarms: none
• Relays: none
Percentage conduit fill = 38%
3/4 in. dia.
3/4in. dia.
Alarms (4)
Alarms (4)
Relays (2)
Relays (2)
Ethernet
Ethernet
Power
Power
Video
Video
Data
Data
(daisy chained)
(daisy chained)
Data
Data
(daisy chained)
(daisy chained)
Includes:
• Video: one 59U/6U coaxial (0.24 in. dia.)
• Data: one 20 AWG UTP (0.19 in. dia.)
• Power: one 18 AWG UTP (0.21 in. dia.)
• Ethernet: CAT-5 (0.16 in. dia.)
• Alarms: 24 AWG UTP (0.11 in. dia.)
• Relays: 24 AWG UTP (0.11 in. dia.)
Percentage conduit fill = 53%
5
Alarms
Alarms
(multiconductor)
(multiconductor)
Ethernet
Ethernet
Power Power
Data
Data
(daisy chained)
(daisy chained)
Data
Data
(daisy chained)
(daisy chained)