About Us

Jim

(Andrew Gabriel) Wrote in message:
In article ,
Tim Watts writes:
On 29/04/16 12:29, F Murtz wrote:
jim wrote:
Tim Watts Wrote in message:
On 29/04/16 00:48, The Natural Philosopher wrote:
On 28/04/16 20:41, jim wrote:
How far could I reasonably expect a mains extension lead to run
whilst successfully running an 240v cement mixer?

Any other ways to increase that? (apart from petrol ;-)

TIA

I've done 100 meters

Just checked TLC volt drop calculator - 1.5mm2 flex will drop around
0.13V/m at an assumed 1kW load so at 100m the OP will have 13V lost
which is OK (not within the regs for fixed wiring, but more than fine
for a machine with a rough simple motor.)

So a heavy duty 13A extension should do the job.

Thanks Tim I'll have a play with that calculator :-)

Instead of playing with calculators, just plug it in and see (unless you
still have to get the mixer)

I disagree - it's a simple enough thing to calculate and 1.5mm2 whilst
marginal, it almost certainly going to be fine with a 1kW load. If in
doubt, 2.5mm flex will have ample headroom on a much bigger load.

Standard guideline max lengths for 13A extension leads to
ensure low enough impedance for rapid fuse blowing a
1.25mm² 12 metres
1.5mm² 15 metres
2.5mm² 25 metres (these are nice and easy to remember)

If you reduce the extension lead plug fuse, you can scale
these up proportionally, e.g.

2.5mm² 25 metres with 13A fuse
2.5mm² 32 metres with 10A fuse
2.5mm² 46 metres with 7A fuse
2.5mm² 65 metres with 5A fuse
2.5mm² 108 metres with 3A fuse

Cement mixer will probably blow (or overheat) a 3A fuse,
but it might work with a 5A fuse. Stretching that to 100m
is not very far out of spec (and if the supply impedance
is low, that would compensate).

Like I said before, make sure you use an RCD at the supply
end of the extension cable.

Another option would be to buy a 100m real of 4mm² cable.
Depending how long its going to be in place, what the site
conditions are, who else is going to be there, etc, you
could buy 4mm² SWA or tough cable. Cheapest would be
4mm² T&E, but it's also the most fragile.

Many thanks Andrew & to all for their help.

--
Jim K

----Android NewsGroup Reader----
http://usenet.sinaapp.com/

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Extension leads	Fred	UK diy	32	November 20th 10 04:20 PM
Offers on cement mixers?	David WE Roberts	UK diy	8	August 24th 09 05:04 PM
extension leads	Tony	UK diy	10	June 9th 06 06:50 PM
Cement Mixers - Why have they always been ~ £200 ?	.	UK diy	20	February 10th 06 09:55 PM
cement mixers - help choosing needed!	ceg	UK diy	11	August 22nd 05 07:40 PM

Menu

About Us