PB iMPB, Руководство по установке, Страница: 7 / 8

Powerbar iMPB
Page 06
Maintenance of Busbar

Powerbar I MPB is constructed using simple, robust mechanisms
with connection busway joint principles established and verifi ed in
the Electrical Industry for over 50 years.

The design lends itself to simple reliable installation that
enables future modifi cations to be carried out easily. It has therefore
no defi ned routine maintenance requirements.

The joint and busway design means that any maintenance that
may be required is easily identifi ed by thermal imaging of the run.

All the system components are designed and tested according
to the requirements of UL857 and IEC61439.

Maintenance should be carried out in line with NEMA BU 1.1-
2010 “General Instructions for Handling, Installation, Operation
and Maintenance of Busway Rated 600 V or Less.” and any other
local code requirements.
Maintenance of Tap Off Module
As with the main Busbar system the joints require checking on
the Tap Off connections. Thermal Imaging can identify localised
heat spots.

As previously described, upon identifying a local problem
preventative maintenance should be investigated with the
busbar isolated.

Visually check the installation of the Tap Off Module, Check
outgoing cable connections.
Check the operation of the switching device positive ‘ON’, ‘OFF’
operation. Examine protective device for sign of short circuit
operation. If a short circuit has occurred on the equipment
connected to the tap off module check operation of device and
the integrity of the device.
Energizing

Only authorized, competent personnel should energize
electrical circuits in line with ‘switching procedures’ and ‘permit
to work’ forms provided by the Site Electrical Supervisor.

All connected load to the Busbar Trunking via tap off s for
example should be isolated prior to energizing the bar.

The Main Supply switch to the Busbar is to be energized fi rst.

The Protection Settings should be at the circuit breakers
minimum protection level.

Only when the Busbar is being put into service are the
Protection Settings set to the specifi ed fi gures.

Following the successful closing off the supply breaker, close the
circuit breaker(s) supplying the connected loads (via Tap-Off s)
one by one.

Visually inspect the energized Busbar route to look for any
anomalies. Listen for noises from the system as this could
indicate untightened cover plates.
Prior to Energizing
A test must be completed prior to energizing
Step 1. A continuity test to verify the run is complete.
Step 2. A ductor test to check the resistance of the joints through
the entire length.
Step 3. A megger test, 600VDC between each conductor and
ground. Readings will vary widely between site to site due to
length of run, humidity, temperature and site conditions. If
readings less than 5MΩ are obtained, measures must be taken
to identify the location of the low resistance level and take
appropriate measures to increase the resistance level. This test
should only be carried out by competent personnel.
Step 4. Ensure all tap off boxes have been correctly installed as
instructed and are in the ‘ON’ position for insulation resistance
testing.
Step 5. Ensure all connections to the Busbar / tap off s have been
disconnected.
Step 6. Verify that all joints have been torqued according to
the recommended setting and have not been subsequently
loosened. Ensure all joint covers are fi rmly secured.
Step 7. When reconnecting the system prior to energization,
ensure correct Phase Rotation is achieved by testing prior to
energizing the supply.
Step 8. Ensure all tap off s are turned off again prior to Energizing.
.