Voltage Drop

I need to add a new relay which will be located approx 70m from the main coms room in the house, which houses most of the C-Bus relays etc. The network this new relay will be on currently consumes 1652ma and has 1800ma of supply.

Given the distance my preference is to install a powered relay to avoid possible voltage drops. This will put me at the 2A limit. Is there any downside to running the full 2A when only drawing 1652ma from the system.

Thanks

Andrew

 

That should be fine. The units will only draw the current they need, so adding extra power supply will not increase the current draw.

The 2A limit is mainly there in case of short-circuits in the wiring.

 

No.

The 2A limit is imposed because of the rating of the C-Bus cable. Over this, and there is a risk of cable damage due to excessive temperatures. This may be a concern depending on where your cabling runs relative to sources of heat (note that sources of heat include other cables carrying current) and proximity to thermal insulation. It's a difficult problem to define precisely in each installation, hence the cable has been given a rating of 2A which can be used as a guideline.

Running a C-Bus network at the 2A limit will not stress any other component of the system.

 

The C-Bus cable is in an underground conduit with a couple of Cat 6 cables and shielded security cables so is well isolated. Will go with the L5508RVF for this one. Many thanks for the quick response.