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Diversity

Good morning all.

I have a question regarding diversity calc.

So, for example, I have a office unit that has three floors.

There is a main DB feeding the block, each floor has a submain DB feeding three single dbs.

For ease I will make all the DBs the same.

So, the single dbs supply:

3 x 16A Power circuits,

2 x 32A Shower circuits feeding a 7KW shower on each,

1 x 16A Water Heater feeding a 3 KW heater,

1 x 6A Lighting circuit feeding 6 x 20W lights.

So, for diversity I have

Power - (100% x 16) + (50% x (16 + 16) = 32A

Water Heaters - (100% x 30.4) + (100% x 30.4) + (25% x 13.04) = 64.06

Lighting - (90% x 0.52) = 0.46

Which give a total diverse loading of 96.52 A (100A supply).

Which gives a 300A supply to each submit DB and a 900A supply to the main DB

Is this correct?

Now, line 9 of table A2 gives a diversity of final circuits.

How would, if I should, apply this.

Thank you in advance.

Richard.

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0 Former Community Member over 5 years ago

wallywombat:

If these are offices with no parking spaces and where employees are encouraged to cycle to work, then there may be many sweaty personages all trying to use the showers at 08:50, and diversity might take a nosedive.

But equally, all those people in showers won't be at their desks etc, so there is some balancing going on here. Unless the whole workforce is made up of teenage girls, I would expect most morning showers by cyclists to be short sharp activities - and there could easily be several consecutive showers that would actually only get you to appoint where the cable is at operating temperature (ie the cable constant)

Whilst we should not be designing for small overloads of long duration, a bit of a flurry of activity with the showers would not neccesarily be of any note in terms of a sensible design

If there really are 18 showers, then I suspect a good engineering challenge would be to consider a calorifier and a 3 phase immersion input (so you can trade much lower input energy for time to achieve the same number of showers)

Regards

OMS
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0 Former Community Member over 5 years ago

wallywombat:

If these are offices with no parking spaces and where employees are encouraged to cycle to work, then there may be many sweaty personages all trying to use the showers at 08:50, and diversity might take a nosedive.

But equally, all those people in showers won't be at their desks etc, so there is some balancing going on here. Unless the whole workforce is made up of teenage girls, I would expect most morning showers by cyclists to be short sharp activities - and there could easily be several consecutive showers that would actually only get you to appoint where the cable is at operating temperature (ie the cable constant)

Whilst we should not be designing for small overloads of long duration, a bit of a flurry of activity with the showers would not neccesarily be of any note in terms of a sensible design

If there really are 18 showers, then I suspect a good engineering challenge would be to consider a calorifier and a 3 phase immersion input (so you can trade much lower input energy for time to achieve the same number of showers)

Regards

OMS
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