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Power Cabling
The figure below depicts the elements of a power supply device:
Figure 94.
Power Equipment Elements
Commercial
Power
Since power is applied to the system where the power cable is connected by
manipulating the circuit breaker of the rectifier, ensure to check the rectifier
breaker is turned off (open) before connecting the power cable to the power
connector. If the system is installed while the circuit breaker is on, the worker may
get critically injured if the cable is connected in the wrong way.
Handling the power cable incorrectly may damage the rack or cause an electric
short-circuit through the cable. Ensure the power switch of the rectifier or the
system is turned off before handling the power.
The fasteners for power cable must be tightly secured to prevent electrical
accidents.
The heat-resistant temperature of the power cable should be 90°C or more.
Install the power cable to the power port of the system by considering the radius of
curvature of its cable specification and then cut the cable. If the operator installs
the cable after cutting, there may be length difference among the core wires at the
end of the cable because of cable curvature. This may result in poor contact after
the cable is connected to the power port.
If you turn the power on and off rapidly (within 1 s), the counter electromotive
force caused by cable inductance can damage the system.
Connecting more than one power cable together may increase power loss.
It must be verified that the rectifier or the power distributor has an output voltage
within the specified system input range before the power line is connected.
For a 12 AWG DC power cable, the possible length is up to 43 m (@ DC
distribution box for supplying a minimum of 42 V) if the cable installation is
normal. When the installation condition changes, the distance changes.
Install a circuit breaker to a rectifier (or power distributor) for the stable power.
The capacity of the circuit breaker is 10 A. (Use UL listed circuit breakers.)
5G NR HRU Installation Manual v1.0
Copyright © 2018, All Rights Reserved.
AC
AC Distributor
Chapter 3 Connecting Cables
DC
Rectifier
Confidential
System
94
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