• Welcome to the new forum. We're now hosted on ElectriciansForums.net rather than ElectriciansForums.co.uk - Chat about the forum upgrade by CLICKING HERE

Welcome to our Electrical Forum - We started out providing electrical advice just for the UK - But now we have specific advice for the USA too! - Register for free and share American Electrical Advice.

Discuss Load Testing in the Electrical Forum area at ElectriciansForums.net

Status
Not open for further replies.

allybally69

EF Member
Hi, ive been asked to carry out Load testing on a whole shop to see if the existing supply cable can take more load, now I'm familiar with working out loadings with the on site guide, but the conversation I had led me to believe this can be measured with a clamp meter, surely this way is not very accurate and it depends on what's plugged in at the time or am I completly barking up the wrong tree, some advice would be much appreciated

Thanks
 

Besoeker

Electrician's Arms
Hi, ive been asked to carry out Load testing on a whole shop to see if the existing supply cable can take more load, now I'm familiar with working out loadings with the on site guide, but the conversation I had led me to believe this can be measured with a clamp meter, surely this way is not very accurate and it depends on what's plugged in at the time or am I completly barking up the wrong tree, some advice would be much appreciated

Thanks
Depends on what is plugged in an actually drawing power I suppose. I think you would need to record it over a 24 hour period. For industrial that's what I would do.

You could add up the power of everything connected but not all will nezccesarily run at thze same time. If by shop you mean retail then refridgeration units will cycle on an off. You would need to apply a diversity factor.
 

allybally69

EF Member
Great thanks, the only thing that's in there is lights, fixed heaters, small undersink water heater, a computer desk and lots of sockets free for anyone to use

Thank you
 

Murdoch

Electrician's Arms
How much "more load" do they want to add?

Maybe you need to work out diversity (but don't rely on the IET / OSG calculations) AND visit at "peak times" and use a clamp meter.....
 

Andy78

Respected Member
Forum Mentor
Electrician's Arms
Trainee Access
If the job can afford it, a load monitor/data logger hired for a week or two will yield the most accurate and comprehensive picture of the actual sausage.
 

Murdoch

Electrician's Arms
Great thanks, the only thing that's in there is lights, fixed heaters, small undersink water heater, a computer desk and lots of sockets free for anyone to use

Thank you
What do they plug in?

What size is the DNO fuse?
 

allybally69

EF Member
Yeah its a coffee shop, it will just be phones and laptops id hope, I have a meeting with the client in 2 weeks time so will find out more then
 

Andy78

Respected Member
Forum Mentor
Electrician's Arms
Trainee Access
Yeah its a coffee shop, it will just be phones and laptops id hope, I have a meeting with the client in 2 weeks time so will find out more then
The large loads will be the coffee machine/s, wall heaters, and under counter water heater. I would assume that these would be the bulk of the existing loading and on pretty much all of the working day, as well as the lighting of course.
Having said that, the alterations sound quite minimal in extra load.
 

HandySparks

Forum Mentor
Electrician's Arms
Trainee Access
DIY
If the job can afford it, a load monitor/data logger hired for a week or two will yield the most accurate and comprehensive picture of the actual sausage.
If it's just load current you want to record, than one of the cheap domestic energy monitors will do the job. I have an Owl USB one which will allow you to download power readings at one minute intervals for a month.
 

GMES

Hairy and proud
Staff member
Admin
Forum Mentor
Electrician's Arms
CCTV / Alarms
Solar Guru
Trainee Access
DIY
Data logger every time, I shelled out for the fluke 1730 last year and although nearly 2k it has paid for itself already, Fantastic piece of kit. you can log from as little as 10 minutes up to 3 months. then just either print or email all results to customer.
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj947L1uKvSAhVlK8AKHb0OCtgQFgg_MAA&url=http://www.fluke.com/fluke/uken/power-quality-tools/logging-power-meters/fluke-1730.htm?pid=77038&usg=AFQjCNGnHjRhAJBpzOKi16mU1CBGilnO1A&bvm=bv.148073327,d.ZGg
 

HandySparks

Forum Mentor
Electrician's Arms
Trainee Access
DIY
Data logger every time, I shelled out for the fluke 1730 last year and although nearly 2k it has paid for itself already, Fantastic piece of kit. you can log from as little as 10 minutes up to 3 months. then just either print or email all results to customer.
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj947L1uKvSAhVlK8AKHb0OCtgQFgg_MAA&url=http://www.fluke.com/fluke/uken/power-quality-tools/logging-power-meters/fluke-1730.htm?pid=77038&usg=AFQjCNGnHjRhAJBpzOKi16mU1CBGilnO1A&bvm=bv.148073327,d.ZGg
For the purposes of the OP, what would be the benefit of spending £2k rather than £50? (plus a bit for two more current clamps if three phase).
 

HandySparks

Forum Mentor
Electrician's Arms
Trainee Access
DIY
A record over a period of time rather than an instantaneous value.
As I said in post #10, my cheap energy recorder stores electrical loading at one minute intervals over a one month period (which you can download to a pc and import into a spreadsheet).

Edit:
Here's a snapshot of a spreadsheet of my own electricity consumption for the second half of December:
View attachment 35621
 
Last edited:

GMES

Hairy and proud
Staff member
Admin
Forum Mentor
Electrician's Arms
CCTV / Alarms
Solar Guru
Trainee Access
DIY
@HandySparks Besoeker has given a good enough answer for me, At no point did I suggest the op should spend 2k, these units are for hire at 100-150 per week in fact mine is for hire for 100 a week lol, which is how it has paid for itself.
I bought mine because all we do is Ind/comm so are constantly either monitor factories for energy saving solutions or for same reason as above it is on a customers factory at the moment to see what spare he has in his 800amp supply.
 
Status
Not open for further replies.

Electrician Talk

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Electrical 2 Go - Electrical Supplier and Electrical Wholesalers
Electrical Insurance
ElectriciansForums.net (formerly known as ElectriciansForums.co.uk) was setup in April 2006 to provide free electrical advice to both professional and DIY electricians. Whether seeking advice for auto electrics, trying to find electrical installation condition reports (EICR) form downloads, or whether you're here just to talk to other electricians; we've been a first-choice website for tens of thousands of sparkies for well over a decade.
Top