Suitable cable size for 200m length

[holmslaw]

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[bernardgreen]

REQUEST TO ALL READERS:

Suggestions please on what to do with guessers and chancers who give stupid advice.

Put them and their power to mis inform through a 100 to 1 ratio transformer and let their own lack of knowledge transform them into insignificant power.

 

[ricicle]

You have a total load on the mains voltage side of about 0.12A so 2.5 arctic flex will be fine, the total volt drop will be in millivolts. You will also need 30mA RCD protection, this could be acheived by a plug in device on the first extension lead.

Edit - Current figure adjusted from 0.06A to 0.12A

Plugwash was correct

You're still wrong -

28.8W x 5 = 144W 144W/230v = 0.63A

 

[holmslaw]

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[Monkeh]

Forgot to x 5.

I wish I was perfect.

Strive to read and you'll be one step closer.

 

[Spark123]

Just for my own understanding, could someone please write out the calculations used to work it out as 0.6A and the voltage drop associated with that. It's apparently not the calculations used by Holmslaw but I'm interested to know how it's calculated and how you calculate that the 1.5mm arctic flex would be suitable. All I know is that it has an amp rating of 15A and a resistance of about 13ohms per km @20degreesC.

I just find it interesting. I'm an engineer just not an electrical engineer!

Your overall design current is your total wattage divided by the supply voltage i.e. (28.8 x 5)/230 = 0.63A
This will be apparent in the first leg of your chain.
The next leg will only have 4 sets so the current is lower, i.e. (28.8 x 4)/230.
To work out the volt drop all you need to do is plug the figures into the equation for each length, i.e. (32x0.63x50)/1000 to give you the volt drop for the first leg.
You could just do the volt drop for the whole lot, if this is within the 3% limit for lighting there is little point in working it out in bits.

 

[ricicle]

I wish I was perfect.

It's not easy, but someone's got to be...

 

[westie101]

Though thinking back to the initial post, this seems to be a temporary set up for a one off occasion. As such some of the fixed rules may change.

If the above is correct the need for arctic grade cable may not be as critical (this type is used, in part, for it's better performance with UV light).
It may be as cheap just to purchase a suitable number of 50m extension leads at your local DIY store! (and saves you having to fit plugs/sockets to cable)

 

[Monkeh]

Though thinking back to the initial post, this seems to be a temporary set up for a one off occasion. As such some of the fixed rules may change.

If the above is correct the need for arctic grade cable may not be as critical (this type is used, in part, for it's better performance with UV light).
It may be as cheap just to purchase a suitable number of 50m extension leads at your local DIY store! (and saves you having to fit plugs/sockets to cable)

In my experience, buying several hundred meters of arctic flex from say, TLC, is far cheaper than buying long extension leads from DIY sheds. It's also cheaper than buying ordinary PVC flex (for what reason I'm not sure).

 

[Taylortwocities]

For a friend's wedding, we want to string up 5 sets of fairy lights, in series,

Just as an aside (for you engineers).

The individual light sets will be in parallel across the supply, not in series.

 

[ban-all-sheds]

Forgot to x 5.

So as well as being an obnoxious tw@, you're also an idiot.

 

[holmslaw]

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