Diversity

[seftonbarn]

Here goes first thread. Go easy on me.

I'm trying to suss out the guidance on Diversity contained in the OSG. In particular there are 2 tables A1 (Current demand to be assumed for points of utilisation and current using equipment) and Table A2 (allowances for Diversity).

For example in table A1 it states a minimun of 100W per lampholder as the "current to be assumed" (ignoring complications on discharge lights in the notes). But in Table A2, in a house, it states for lighting to allow 66% of the total current demand.

Here's my interpretation.

Use Table A1 for the purposes of determining I[SUB]b [/SUB]for sizes of cables and protective devices and voltage drop etc and use Table A2 to apply diversity to determine the maximum demand for the whole installation to ensure suitablity of the main DB isolating switch.

Please tell me if you think if I am on the right tracks or not.

 

[Guitarist]

Isn't Diversity a pop group?

 

[Sparky Ninja]

Here goes first thread. Go easy on me.

I'm trying to suss out the guidance on Diversity contained in the OSG. In particular there are 2 tables A1 (Current demand to be assumed for points of utilisation and current using equipment) and Table A2 (allowances for Diversity).

For example in table A1 it states a minimun of 100W per lampholder as the "current to be assumed" (ignoring complications on discharge lights in the notes). But in Table A2, in a house, it states for lighting to allow 66% of the total current demand.

Here's my interpretation.

Use Table A1 for the purposes of determining I[SUB]b [/SUB]for sizes of cables and protective devices and voltage drop etc and use Table A2 to apply diversity to determine the maximum demand for the whole installation to ensure suitablity of the main DB isolating switch.

Please tell me if you think if I am on the right tracks or not.

Your on the right track pretty much.

Plus if you were designing a distribution circuit then applying diversity (effectively) to the final circuits will allow you to use a smaller conductor size distribution cable.

 

[Richard Burns]

Here goes first thread. Go easy on me.

I'm trying to suss out the guidance on Diversity contained in the OSG. In particular there are 2 tables A1 (Current demand to be assumed for points of utilisation and current using equipment) and Table A2 (allowances for Diversity).

For example in table A1 it states a minimun of 100W per lampholder as the "current to be assumed" (ignoring complications on discharge lights in the notes). But in Table A2, in a house, it states for lighting to allow 66% of the total current demand.

Here's my interpretation.

Use Table A1 for the purposes of determining I[SUB]b [/SUB]for sizes of cables and protective devices and voltage drop etc and use Table A2 to apply diversity to determine the maximum demand for the whole installation to ensure suitablity of the main DB isolating switch. or the suppliers fuse for the expected installation

Please tell me if you think if I am on the right tracks or not.

Sounds about right, just remember that this is guidance and real life will demonstrate that the actual values are usually much lower.
A1 is points of utilisation and A2 if for multiple final circuits.

 

[trev]

Isn't Diversity a pop group?

Dancers mate, they won Britain's Got Talent a few years back
(According to my daughter)

 

[truckster]

Dancers mate, they won Britain's Got Talent a few years back
(According to my daughter)

Like you never watched it eh!

 

[seftonbarn]

Should have been Susan Boyle. Shes was robbed.

 

[trev]

Like you never watched it eh!

I admit I watch it mate but some of the things on there are instantly forgetable, usually it's the dancers