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Cable routing/eddy currentso

Hi

I have a query regarding a cable route for a job I’m currently on (when lockdown rules allow me back to it!). I have to supply a feed motor on a farm, the contactor feeding it is at one end of the building in a plant room. There is an existing steel trunking running the length of the building and I plan to come out of this close to the motor with pvc conduit. However there is a paddle switch in the meal hopper beside the motor that will control the contactor. This needs a simple two wire connection. My question is can I run these two cables out of the trunking in the same conduit as the cables to the motor. I plan to put a wiska box or similar at the other end of the conduit so that I can split off to the motor and paddle switch separately, and there will be an isolator before the motor.

The question however remains regarding the ‘control cables’ in the same conduit as the motor supply. They are from the same circuit and the same voltage but was concerned about eddy currents.

Thanks in advance

Parents

0 Zoomup over 5 years ago

Baldyhugh:

So just to clarify either of these methods below are acceptable when coming out of a steel trunking in a single hole in plastic conduit to a plastic box and switch;

Just line/switch line and earth to switch position for both circuits

Line/neutral/earth in and out of switch position for both circuits

Thanks in advance

Yes both methods are o.k. 1. Line into switch and switched line out to lights through the same hole in the metal trunking, with suitable mechanical protection to avoid damage to insulation of course, and a single earth terminated in the plastic box. Note. A single line lighting feed and two switched lines out can also be used. The supply line being common to both lighting circuits and linked at the switch. So one supply line in and two switched lines out through the one hole is o.k. with a two gang switch.

or.....

2. Supply line in to switch+neutral feed in to switch box, then switched line(s) out to lights and unswitched neutral out to lights. Earth (C.P.C.) in and out as well.

Method 1 is easier. Method 2 is perhaps more suited to domestic or office installations where a switch upgrade to an electronic control needing a N. may happen at a later date.

Z.
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0 Zoomup over 5 years ago

Baldyhugh:

So just to clarify either of these methods below are acceptable when coming out of a steel trunking in a single hole in plastic conduit to a plastic box and switch;

Just line/switch line and earth to switch position for both circuits

Line/neutral/earth in and out of switch position for both circuits

Thanks in advance

Yes both methods are o.k. 1. Line into switch and switched line out to lights through the same hole in the metal trunking, with suitable mechanical protection to avoid damage to insulation of course, and a single earth terminated in the plastic box. Note. A single line lighting feed and two switched lines out can also be used. The supply line being common to both lighting circuits and linked at the switch. So one supply line in and two switched lines out through the one hole is o.k. with a two gang switch.

or.....

2. Supply line in to switch+neutral feed in to switch box, then switched line(s) out to lights and unswitched neutral out to lights. Earth (C.P.C.) in and out as well.

Method 1 is easier. Method 2 is perhaps more suited to domestic or office installations where a switch upgrade to an electronic control needing a N. may happen at a later date.

Z.
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Vote Up 0 Vote Down

Cancel

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Cable routing/eddy currentso

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