
100 Electrical industries
In any event, accurate measurements—either on site or, more
usually, from the plan—are essential, in order that the shortest cable
routes are found. Once the design or layout of the cables and accessories
has been established, material quantities can be assessed.
The following examples illustrate typical calculations for the
domestic dwelling.
Diversity
In any installation it is unlikely that every power and lighting point and
other appliances will be used simultaneously and so the total current
drawn from the supply is unlikely to be the total possible.
The I.E.E. Regulations give the percentages of the total connecte ...