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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 richard64 over 5 years ago

Thank you all so much for your replies.

Andy...there aren't that many showers. I just put a example together for brevity. :-) (No-one needs to be that clean).

The real life example I was working on was:

1 x 3Ph main Board;

feeding 3 x 3ph sub main boards (1 per floor);

Each feeding 7 x 1 Ph Dbs on the floor.

The main issue I had was that there were 33 general power circuits.

So I spoke to the client, and we agreed to assume 2 x 32A supplies per floor. (Approx 125m2 floor area per floor). So then applied diversity to that.

What I've done, in the end, is to take the building as a whole, apply diversity to that, to calculate the main supply.

Then, divided the building into floors, and carried out diversity to each floor, to give the sub main calculations to each floor's 3ph board.

I'm about to do the same for each 1ph DB to give me the supply to each of those.

Does this should reasonable?

Apologies for any spelling mistakes...spell uncheck is going crazy at the moment.

No.9 in Table A2 seems a really simple way of calculating..is it too simple?

Once again, I really appreciate your comments and advice.
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0 richard64 over 5 years ago

Thank you all so much for your replies.

Andy...there aren't that many showers. I just put a example together for brevity. :-) (No-one needs to be that clean).

The real life example I was working on was:

1 x 3Ph main Board;

feeding 3 x 3ph sub main boards (1 per floor);

Each feeding 7 x 1 Ph Dbs on the floor.

The main issue I had was that there were 33 general power circuits.

So I spoke to the client, and we agreed to assume 2 x 32A supplies per floor. (Approx 125m2 floor area per floor). So then applied diversity to that.

What I've done, in the end, is to take the building as a whole, apply diversity to that, to calculate the main supply.

Then, divided the building into floors, and carried out diversity to each floor, to give the sub main calculations to each floor's 3ph board.

I'm about to do the same for each 1ph DB to give me the supply to each of those.

Does this should reasonable?

Apologies for any spelling mistakes...spell uncheck is going crazy at the moment.

No.9 in Table A2 seems a really simple way of calculating..is it too simple?

Once again, I really appreciate your comments and advice.
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