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2011/09/28 at 1:54 pm
#12329

IHOORA MICHAEL

Participant

My regards;

The number of down

conductors can be determined as follows:

1-One conductor for a structure whose base area does not

exceed100 sq m

2-Determine the whole numbers N1 and N2, and select the

smaller of the two

N1=1+(A-100)/300

N2=P/30

Where N=whole number

of the working area

A=base

area of the structure in sq m

P=perimeter of the structure in m

3-Where the height of the structure is more than 30m in

height, additional considerations to

the above should be applied.