how to connect a CBus relay to a TP of 20A

hi all, how will i connect CBus relay or Dimmer to a lighting circuit that is feeding from a TP(triple pole) of 20A? is that possible?

 

When you say that the circuit is feeding from a Triple Pole 20A circuit, there is a few points that it would help if you clarified:

Is there one Triple-pole 20A breaker? or 3 seperate 20A Breakers?

What kind of load are you controlling?

Is it possible to seperate the loads down into smaller groups, or do they HAVE to run at the full 20 Amps?

Is the load manufactured as 3 phase? or Single phase?

Is the entire load/Are the entire loads all controlled from one breaker/switch? or are they fed from the triple pole breaker, and controlled by several normal switches at the moment?


If you are able to seperate the loads into smaller ratings, then you have several dimmer options, if not, and the loads are actually single phase loads, but high amperage, you may be able to use an Architectural dimmer, if the load is some kind of weird 3 phase load, I'm not sure you will be able to dim it at all.

As far as using a relay is concerned, there are several options that you have to be able to simply switch them all on and off with C-Bus, but I will hold out on answering until I know more about the type/s of load/s you are running and how they are all wired, controlled, and fed at this point.

Darpa

 

Hello friend,

The 20A TP directly feeds the Load. TP is of a combined unit and feeds 3 channels each with 20A. We can split the cicuits in the secondary side.
we are controlling Lighting loads. they are of Single phase.
The loads are controlled from the TP itself. No normal switches to control different circuits.

 

What sort of lights are they...

If they are Fluros, or another type of gaseous discharge (eg. Mercury Vapour, Metal Halide, High Pressure Sodium etc) then dimming via cBus isn't the way to go. In this case id use a cBus relay channel to switch the coil of a suitably rated contactor (big relay) which would in turn switch the load.

If they are incandesent or Halogens suitable for dimming you would need either three dimmer units (one for each phase or possibly more depending on loads) or an architectual dimmer that has three phase in your electrician can help with this.

Andrew

 

As Andrew has said, If the loads are any type other than incandescent (wire filament) type loads, dimming is not an option. You would be best to use a 3-phase (3 Pole) contactor, controlled by a C-Bus Relay.

If the loads are Incandescent, and therefore suitable for dimming, you can use one of the Professional Series C-Bus dimmers. To do this, you would need to split each phase of lighting apart, and turn them into 3 separate circuits. You can still run each circuit from a different phase, but you would need to install single-pole breakers, one for each phase/circuit/dimmer.

The dimmer I would suggest looking at is the L5101D20, the 1-channel one at the top of this page:
C-Bus Professional Series Dimmers

Hopefully this helps to point you in the right direction, and if you have any doubts, then please either speak to your electrician, or come back here and ask more detailed questions.

Good Luck!!

Darpa