Re: Bundling of coax cables

[Tony Krzyzewski <tonyk@kaon.co.nz>]

> so ensure that the "negative" part of all the power supply circuits are
> completely separated from the "grounding" circuit with their own
> circuit systems.

This separation of the ground line from the power line is not necessary within

the cabling structure other than to say that it would reduce the possibility of

shorts if the cables were chafed and a power line happened to contact a ground

line.

What is important is to ensure that each device has its own independent ground

return line and that all of those grounds are terminated at as few points as 
possible....preferably one. Failure to do this can result in an 
electrically 'noisy' environment which can affect audio systems.

In reality the removable nature of the Europa instrument panel may mean that 
you have a few ground distribution blocks. In this case the ground blocks 
should be linked by a large gauge wire. 

In my aircraft all fuselage located devices are terminated on a single ground 
block located on the firewall to which is connected the 4AWG wire to the 
battery. A 10AWG wire from that block connects to another distribution block 
located in the instrument panel that has all of the panel grounds connected to

it.

Bob Nuckolls (www.aeroelectric.com) makes a rather good Faston ground block. It 
has a bolt to penetrate the firewall which allows you to terminate the battery

ground wire from an aft mounted battery. It gives you ground blocks on the fore

and aft faces of the firewall and allows you to conveniently terminate all your

grounds without using a single screw terminal. You can make the same sort of 
thing up yourself if you have a hefty soldering iron.

Regards

Tony