36
Appendix D: Cabling requirements
This section contains recommendations for installers and electricians for the
application and wiring of Challenger equipment with respect to:
• System earthing
• Ethernet cabling
System earthing
The following requirements are essential to the reliable operation of the
Challenger system.
• The earth connection is provided in the enclosure transformer output lead. Do
not extend this wire to any device outside of the enclosure.
• Install LAN isolation devices between multiple buildings and maintain
independent earthing systems. For example, use TS0893, TS0894, or
TS0896 Isolation Interface modules to provide electrical isolation and/or to
extend distance.
Ethernet cabling
To comply with Class B radiated emissions the Ethernet cable should be cable
tied to the enclosure rear for a minimum length of 40cm.This can be a straight
run or a number of loops.
Power supply to RS-485 devices (refer to Figure 5 External Power Supply
Connection to RAS on page 23)
Devices on the Network Access Controller’s buses may be supplied from the
Network Access Controller’s 12V DC LAN output. Use an external 12V power
supply (such as TS0073 2 A Power Supply) when:
• The device is more than 100 m (data cable length) from the panel
• Electrical isolation is required
• More power is needed than can be provided by the LAN
When powering a LAN device from an external 12 V power supply:
• Connect the external power supply ‘+’ terminal to the device ‘+’ terminal.
Do not connect the power supply ‘+’ to the LAN ‘+’.
• Connect the external power supply ‘−’ terminal to the device ‘−’ terminal.
• Connect the LAN cable black wire ‘−’ to the device ‘−’ terminal.
To Previous Page
Loading...
