Answer Posted / sobhuza, za

It's because the equipment is rated based on the capacity
levels and not at loading levels. CB ratings are
standardised, as it may happen that the loading on one
circuit is 50A, but on another it can be 900A. So for
rating purposes it is better to standardise at say 1250A so
for ease of procurement. Remember that when the load
increases over time and you won't have to change CBs due to
loading increase.

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