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Need to install the PCC?
Here’s what you should do
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Embed fabricated ‘C’ channels in the foundation and place the PCC on these channels. The base frame of the PCC should be tackwelded to these channels.
Ensure that the PCC is mounted on a flat and levelled surface. Use shims if the floor is uneven.
Locate and level the first section unit in position on the foundation channels.
Place second section next to the first section.
Remove top plates above the horizontal busbars of both these sections. Remove fishplates from the horizontal busbars and the earthbar.
Clean the fishplates with a wire brush, wipe them with a soft, dry cloth and then immediately apply contact grease on them. Hindustan Petroleum MPL (EXXON)/Petroleum Jelly J.P. grade contact grease or equivalent is recommended.
Bolt adjacent sections together before joining the busbars.
Join horizontal busbars and earthbar of the two sections with fishplates prepared as given above. Use hardware supplied with the PCC.
Tighten all electrical connections with a torque wrench to the torque values given below:
| Size of Bolt |
Torque in m.kg. |
| M8 |
0.85 |
| M10 |
1.88 |
| M12 |
3.20 |
| M16 |
7.30 |
Replace the top plates.
Join auxiliary busbar located in the front.
Connect interpanel wires to the adjacent transport unit terminals
Check alignment of all feeder doors.
Take care of the following:
In case PCC is located in surroundings containing conductive dust particles like iron ore, coal dust or metallic dust, ensure that all doors are closed firmly to prevent ingress of such dust.
If plant atmosphere is likely to contain excessive percentage of steam or reactive gases comprising sulphur or chlorine, ensure that the PCC is placed in a separate pressurised room.
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Larsen & Toubro - Electrical Business Group
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