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Zig CF8

Hi all,
I'm just at the stage where I need to fit the Zig CF8 and start wiring up and I've run into my first problem.

I have no problem with the consumer unit side of things which is already sorted, my problem arises when I look at the wiring diagram of the 12 volt set-up supplied with the Zig.

The manual states that the negative terminals are common to the case of the Zig and the van (as it will be earthed to the van). Having read this, I thought that I could just run a single cable to each lighting unit and use earth return instead of taking a conductor pair to each unit. The wiring diag shows fully wired returns - is that the way it must be done?

Also, bearing in mind how computerised my Relay van is, might I cause problems by using earth return?