Brilliant video! The only thing I wonder is how you apply diversity to storage heaters that are fixed to a wall. I’m learning to be an electrician and tried doing it to my flat that has 3x1500w storage heaters. Do they get diversity?
Good question! As these devices are on at night typically, and when they turn on they will likely be on for a period until warm and their own thermostat turns them off. As the OSG says it is impossible to calculate Max Demand. Have you got a smart meter this will show your max demand (it would be interesting). Without further information you could use the OSG recommendations for heating devices, but these heaters will be on when most other things are turned off. Sorry it is not really a right or wrong answer for you. In summary as a calculation you may need two max demands one for day time and one for night time. Hope that helps a little probably raises more question and answers - welcome to being an electrician. Please Like, Share & Subscribe.
Hi, Thank you so much for a quality video, however, I do not get it, why did you use 36A design current for shower? If shower is 9.5kW then 9.5*1000/230v = 41A? The current for large circuit suppose to be taken 100% but you are taking only 36A of 40A shower? Where is gone the 4A current? Similarly for the other circuits which you toke off some of the current before even applying the percentage and the diversity.
Thank you, I have used in my example 36A as the design current, these figures are for my design to show how to do it (it is not based on 9.5kW shower - if this is what you have then base your calculations on 41A). The 40A is the protective device size, this is not the design current (current drawn by the load) of the load. So to sum up diversity is based on design current, not protective device sizes. Hope that helps. Please Share with like minded people or maybe even like and suscribe.
I'd say normally part of the cooker, but if that is all you have the first 10A is covered - You will have to use your engineering knowledge and experience from the user for it's use. It will have a thermostat in so when on, it will not call for heat all of the time. As the On-site -Guide and I do say this is not an exact science. Just have your reasoning available as to why you have chosen as you have - all anybody can do is say that is not correct - but they would not know themselves until it is installed and you monitor the load over a period of time. - wow that was a longer response than I expected. Good luck - Please Like, Share & Subscribe.
Very good video but could you explain or do another showing how you calculate diversity on a 3 phase board please when 3 phase and single phase circuits are in the DB. Thanks
Hi You are quite correct the actual answer is 24A - 38A - 10 = 28. 50% of 28 = 14. therefore 10+14 =24A. school boy error... Thankyou for letting me know. Please like Share & subscribe.
Hi Hope it has been useful, anything worthwhile is never easy, practise is all that is required, please share with like minded people or maybe like and subscribe. Good luck!
Brilliant video! The only thing I wonder is how you apply diversity to storage heaters that are fixed to a wall. I’m learning to be an electrician and tried doing it to my flat that has 3x1500w storage heaters. Do they get diversity?
Good question! As these devices are on at night typically, and when they turn on they will likely be on for a period until warm and their own thermostat turns them off. As the OSG says it is impossible to calculate Max Demand. Have you got a smart meter this will show your max demand (it would be interesting). Without further information you could use the OSG recommendations for heating devices, but these heaters will be on when most other things are turned off. Sorry it is not really a right or wrong answer for you.
In summary as a calculation you may need two max demands one for day time and one for night time.
Hope that helps a little probably raises more question and answers - welcome to being an electrician.
Please Like, Share & Subscribe.
Hi, Thank you so much for a quality video, however, I do not get it, why did you use 36A design current for shower? If shower is 9.5kW then 9.5*1000/230v = 41A? The current for large circuit suppose to be taken 100% but you are taking only 36A of 40A shower? Where is gone the 4A current?
Similarly for the other circuits which you toke off some of the current before even applying the percentage and the diversity.
Thank you, I have used in my example 36A as the design current, these figures are for my design to show how to do it (it is not based on 9.5kW shower - if this is what you have then base your calculations on 41A). The 40A is the protective device size, this is not the design current (current drawn by the load) of the load. So to sum up diversity is based on design current, not protective device sizes. Hope that helps. Please Share with like minded people or maybe even like and suscribe.
Very well explained, as is all your content. Thankyou.
Thank you, much appreciated, please, Like Share & Subscribe.
Hi , how about 2 kw oven . How to calculate demand please ?
I'd say normally part of the cooker, but if that is all you have the first 10A is covered - You will have to use your engineering knowledge and experience from the user for it's use. It will have a thermostat in so when on, it will not call for heat all of the time.
As the On-site -Guide and I do say this is not an exact science. Just have your reasoning available as to why you have chosen as you have - all anybody can do is say that is not correct - but they would not know themselves until it is installed and you monitor the load over a period of time. - wow that was a longer response than I expected.
Good luck - Please Like, Share & Subscribe.
You need to know the length of the run what cable your using you need to know all the correction factors and then you can work out volt drop .
Very good video but could you explain or do another showing how you calculate diversity on a 3 phase board please when 3 phase and single phase circuits are in the DB. Thanks
I have watch to the end. Hope that helps.
im confused on how you got 19A on the last example, wouldn't it be 24A
Hi You are quite correct the actual answer is 24A - 38A - 10 = 28. 50% of 28 = 14. therefore 10+14 =24A. school boy error...
Thankyou for letting me know. Please like Share & subscribe.
@@sparkyhelp3997 thanks i was having a meltdown trying to figure it out, thank you for the great video!
brilliant! big Thank You!!
You're welcome! Pease Like, Share & Subscribe.
Thanks a lot
Most welcome, Please Like, Share & Subscribe.
"100% of total current demand up to 10A + 50% of any current demand in excess of 10A" .... I think I picked up a On-Site Guide written in French :\
Hi Hope it has been useful, anything worthwhile is never easy, practise is all that is required, please share with like minded people or maybe like and subscribe. Good luck!