Discuss Diversity applied, max load well over. in the Electrical Forum area at ElectriciansForums.net

ChrisElectrical88

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Seen a couple of threads on diversity and excessive max loads recently.

Just had a design from a clients for their house. Applied diversity is 196A.

Having 2 9kW showers install, A 4kW instant water heater, a cinema room, ring main per floor, lighting circuit per floor and ring main for kitchen.

100A Single Phase Supply
No chance of another supply.

Hes already having 2 combi showers as well as the 2 electric so doesnt want to get rid of them.
 
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How many people in the household? If they got combi showers can't imagine electric being used frequently
 

ChrisElectrical88

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5 people. Ive squeezed it down to about 110A after convincing some changes, showers 7kW with priority board, instant hot water gone and a couple of other things.
 
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I expect they will be disappointed with the 7kw showers though when they get in them to shower.
 
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Curious about how you calculated diversity. Was it highest MCB + 40% of rest?
 

TJ Anderson

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Seen a couple of threads on diversity and excessive max loads recently.

Just had a design from a clients for their house. Applied diversity is 196A.

Having 2 9kW showers install, A 4kW instant water heater, a cinema room, ring main per floor, lighting circuit per floor and ring main for kitchen.

100A Single Phase Supply
No chance of another supply.

Hes already having 2 combi showers as well as the 2 electric so doesnt want to get rid of them.
Hi Chris. 2 x Electric Showers and 2 off the combi. ....

Have they got a cold water storage tank and booster set?!
The water pressure would be an issue!

Forgetting water for a sec. If you go with a prority unit for the shower and ditch the instantaneous 4kW water heater, can you put your calcs up on here for us to look at?
 

ChrisElectrical88

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Diversity was applied using the tables in the OSG. The 7kW showers are for the kids rooms i believe, however he is now considering all 4 showers off a cylender, which if the case would remove any issues i have, he doesnt think more than one shower will be used at any one time anyway.

Regarding water pressure the owner of the house is owns a plumbing business so ill leave the pressue.

I can put calcs up if wanted when i get back to the office.
 

ChrisElectrical88

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Infact, the following is off some scrap paper:

Cylender 16A
1st Floor Ring 12.8A
First Floor Lighting 3.96A
Ground Floor Kitchen Diner Ring 32A
Ground Floor Lounge and Hall Radial 8A
Ground Floor Lighting 3.96A
Lower Ground Cinema Ring 12.8A
Lower Groubd Lighting 3.96A
Heating 3A
Alarm & CCTV 6A

Total is 102.48A
However the lights will all be LED and shoukd only pull about 6A Total with all switched on.
 
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