The following information will assist you to select the size of trunking for the required number and size of cable in your installation.

Cable table

		solid		Stranded		solid		Stranded
Normal conductor size mm		1.5		1.5		2.5		2.5		4		6		10		16		25		35		50		70		95	120		150		240
Factor copper or aluminum		1.7		8.1		10.2		11.4		15		22		38		50		75		95		133		177		227	284		346		552

To determine trunking size: Using the cable table above multiply the quantities of each size of cable by the appropriate factors, to determine the capacity units required.Then, using the trunking size table below select the trunking size which has the nearest higher capacity figure.	Example :What trunking size is needed to run 24 x 16mm cables and 36 x 6mm cables?
	Quality   Factor Sub   total                 24 x  50  = 1,200 36 x  22  = 792   Total 1,992
	Using the trunking size table below, the trunking size required is 100x50 as this has the next higher figure for capacity units.

These tables are bassed on a theroretical calculation and must be taken only as a guide, due regard must be taken of future wiring needs.These figures are bassed on the I.E.E.

Trunking size table Trunking size mm Capacity units Trunking size mm Capacity units                       50 x 50   1037   225 x 50   4646 75 x 50   1555   225 x 75   7114 75 x 75 2371 225 x 100 9298   225 x 150 14652 100 x 50 2091 225 x 225 21766 100 x 75 3189 100 x 100 4252 300 x 50 6182   300 x 75 9486 150 x 50 3091 300 x 100 12788 150 x 75 4742 300 x 150 19447 150 x 100 6394 300 x 300 38894 150 x 150 9697  -----  -----