Voltage Drop

[lurch180]

Hi, I've been asked to run a cable approx. 200 meters to run a shop metal shutter. It has a switch that has a common feed and three cables out, one is on the switch that lifts the shutter the other is off and the 3rd is lower shutter. The current is very low, I put a clamp meter on it and it read 0.06 Amp when running. The voltage is 230VAC. Will I need to worry about the length of the run? If you can advice me I would appreciate it.

Many thanks

Paul

 

[ProDave]

Well you know the working current, you know the length, you should know the allowable voltage drop, so it's easy to work out the cable size.

I do think 60mA sounds a bit low, so I would double check that measurement. I'm sure it's got more than a 14.4W motor. Make the measurement when lifting the shutters up, as it will be working harder then.

 

[Evans Electric]

At 0.6 A  a 1.5 mm2  would do it . clipped direct  dropping say 4A .   It can't be 0.06A  surely .  ( Think I'd  put a 2.5mm in) 

Why did you describe the up/down switching ?    Its not being switched from 200M away is it ?     You have to be stood next to anything such as that to work it....H&S   and all that. 

I have to ask the question Lurch ...do you not have a Regs book ?

 

[steptoe]

if he measured the current with a clamp meter anything like mine, when it gets less than 1A it just gives a random reading , imo anyway,

 

[a3]

if he measured the current with a clamp meter anything like mine, when it gets less than 1A it just gives a random reading , imo anyway,

Please speak to our forum sponsor http://www.isswww.co.uk, he will be able to assist you in a more accurate clamp meter  :Salute