Four pole (FP) bus bar chamber, 415V, rated 32A to 400A — shares one three-phase and neutral supply out to several outgoing feeders.
- Four pole (FP): bars for the three phases and the neutral.
- Rated 415V, in 32A, 63A, 100A, 200A, 300A and 400A ratings.
- Bars mounted on insulated supports inside a box with a hinged door.
- Bolt-type terminals along each bar for connecting outgoing cables.
- Knock-outs on the top and bottom for cable entry.
- No switching or protection of its own — use it after a suitably rated main switch.
- For one incoming supply that must feed several meters, DBs or machines.
A bus bar chamber is an enclosed set of heavy conductors (bus bars) that takes one incoming supply and shares it out to several outgoing cables. This four pole (FP) chamber carries the three phases (R, Y and B) and the neutral at 415V, so it can feed several distribution boards, meter boards or machines from one main.
It is common in apartment blocks (one incomer feeding many meters), commercial buildings, workshops and factories. The bars sit on insulated supports behind a hinged door, with bolt terminals along each bar and knock-outs for cable entry.
Choose the rating from 32A to 400A: it should be at least the rating of the main switch or protective device ahead of it, and the cables and lugs must suit that current.
Choosing the rating
- Match or exceed the rating of the main switch or protective device that feeds the chamber.
- Check that the terminals suit the cable and lug sizes you will use.
- Allow for outgoing feeders you may add later.
The final rating is decided by your electrician or consultant from the maximum demand and the incoming supply.
Where to use it
- Apartment blocks — one incomer feeding several energy meters.
- Commercial buildings — feeding floor or shop DBs.
- Workshops and factories — distributing power to machines and sub-panels.
How to install
- Isolate the incoming supply and fix the chamber firmly on a wall or panel, in a dry, accessible place.
- Bring the incoming and outgoing cables through the knock-outs using suitable glands.
- Connect each phase and the neutral to the correct bar with properly sized lugs, and tighten the bolts firmly.
- Earth the chamber, close the door and keep the main switch and each feeder's protection in place.
Bus bar chambers carry large currents — installation and maintenance must be done by a licensed electrician with the supply isolated.
Frequently asked questions
- What is a bus bar chamber used for?
- To take one incoming three-phase supply and distribute it to several outgoing cables — for example many energy meters in an apartment block, or several DBs and machines in a factory.
- What does FP mean?
- Four pole: there are bars for the three phases (R, Y and B) and the neutral.
- Does a bus bar chamber protect the circuits?
- No. It has no switch, fuse or breaker. The incoming supply needs a main switch with protection, and every outgoing feeder needs its own MCB, fuse or switch-fuse.
- Which rating should I choose?
- At least the rating of the main switch or protective device that feeds it — for example a 100A chamber behind a 100A main. Your electrician sizes it from the maximum demand.
- Can it be installed outdoors?
- Install it indoors or inside a weatherproof panel or room. It is not described as weatherproof.
Buy four pole bus bar chambers online from Electric Market, Chennai. For site, contractor or bulk quantities, contact us for a quote.