I am in the process of installing a sprinkler system using a commercial controller. There is quite an extensive area to be covered, and I am wondering whether, for the further-away sections, it would be preferable to have long pipe runs (with possible loss of water pressure) or long cable runs (with possible loss of voltage).
Blue lines are water, red and black lines are the wiring.
In this plan the solenoids to control the water flow are located near each other, with a 4-core wire controlling them (one per solenoid plus a common). Some sprinklers however would require a fairly lengthy pipe run. The plan isn't to scale, but I have indicated distances on it.
In this plan the solenoids are located remotely from each other (they would each need their own nearby water supply of course). I would now need to run a pair of wires to each one, with the common wire shared. My concern with this is that with this arrangement the common wire in particular might act as an aerial and possibly pick up static or pulses which could affect the controller's behaviour.
These are all outputs from the controller, but still.
From an electrical point of view, which is preferable? Plan A or Plan B? Or won't it make any real difference?