# IHOORA MICHAEL

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• in reply to: High Voltage: circuit breaker is cheaper! #12538
IHOORA MICHAEL
Participant

I agree with you sir, for me am a substation attendant and every thing is possible with use of circuit breakers, regarding resetting in case of a trip and faults are easy to identify with the use of CBs. Imagine of a fuse blowing and you want to replace it, you will take alot of time de-assembling and assembling the components in order to replace the fuse.

in reply to: Lightning Protection #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