OP
sparkymaz
Thanks warren, i think im going to buy a clamp meter and see what the installation is pulling at the min. Would you recomend any?
Much appreciated
Much appreciated
Discuss Maximum demand - please help. in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Thanks warren, i think im going to buy a clamp meter and see what the installation is pulling at the min. Would you recomend any?
Much appreciated
Thank you Trebor.
The regs do state that you make an assessment of the demand and use of the installation, and include a diversity factor, when making that your calculation for maximum demand (311.1 + 313.1)
My argument was purely for domestic properties. If for example your total demand of breakers in the consumer unit was 180A and you added a diversity factor that brought it down to 120A, that is then your maximum demand, but how can you pull that through an 80A fuse?
The OSG gives ways of calculating maximum demand for differnt circuits, how is it possible to apply diversity to all MCB's when for example a shower ciruit must be taken at 100%. And i think 100A would flow through an 80A 1361 fuse for a while if nt a long time before it would trip.
regarding your 2 shower situation,you can get and indeed are recommended,a shower priority switch which works on current demand which effectively reduces your maximum demand.We used this on a B&B.It can also be usefull in other situations.They come in 2 types priority and non priority.One type you can nominate who has prioity,the other type is 1st come 1st served.We had to wire 4 of them thru this changeover switch.Don't know what they cost,or have a link,but I know that ABB do one and also GE.Can result in the odd cold shower but,can also pull you out of a hole regarding your demand problem
Yes,warrenG,I think they are in fact known as shower prioity switches.The B&B we did was in Ireland.This wholesaler lists them www.alphaslam.ie but everything is a lot dearer in Ireland even when you allow for euro/pound,but it will maybe give you an idea.I don't see why they cant be used for other applications though.Be interested in seeing these. Are they actually called priority switches?
regarding your 2 shower situation,you can get and indeed are recommended,a shower priority switch which works on current demand which effectively reduces your maximum demand.We used this on a B&B.It can also be usefull in other situations.They come in 2 types priority and non priority.One type you can nominate who has prioity,the other type is 1st come 1st served.We had to wire 4 of them thru this changeover switch.Don't know what they cost,or have a link,but I know that ABB do one and also GE.Can result in the odd cold shower but,can also pull you out of a hole regarding your demand problem
Reply to Maximum demand - please help. in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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