Installation Manual

1027145–0001 Revision D 6–22 Installing indoor hub equipment Hub installation
17. Snap the strain relief bushing into the conduit opening.
18. Tighten the screw on the strain relief bushing just enough to
hold the wires in place. Do not overtighten.
19. Replace the protective plate and tighten the screws.
• This completes the power connections.
The chassis does not have a power off/on switch. In normal
operation, power is always on. If you need to power off the IDU:
• Break the power circuit at the rack fuse panel,
• Break the power circuit at the external fuse or circuit
breaker panel, or
• Use an optional remote power–off circuit.
This section applies only to dc power circuits.
The circuit from the dc power source (usually rectifiers) to the
IDU chassis must include a circuit breaker or other disconnect
device that meets the following Underwriters Laboratories (UL)
requirements:
To install dc power for the IDU chassis, a readily
accessible disconnect device shall be installed
or should be readily available at the site where
the IDU chassis is installed. The disconnect
device must be a UL–listed circuit breaker rated
at 60 Vdc, 6.3 amperes minimum, 15 amperes
maximum.
Powering off the dc IDU
Remote dc
power–off circuit