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FORMULA TO CALCULATE DIAMETER OF BUNCHED ELECTRICAL CORES

FORMULA TO CALCULATE DIAMETER OF BUNCHED ELECTRICAL CORES

FORMULA TO CALCULATE DIAMETER OF BUNCHED ELECTRICAL CORES

(OP)
CAN ANYONE HELP WE ARE LOOKING FOR A FORMULA TO CALCULATE
THE BUNCHED DIAMETER OF 1  TO 30 CORES OF ELECTRICAL WIRE.

THANKS

RE: FORMULA TO CALCULATE DIAMETER OF BUNCHED ELECTRICAL CORES

For cables of the same diameter
There is a factor
1 cable Factor is 1
7 cables the factor is 3
19 cables the factor is 5
37 cables the factor is 7
61 cables the factor is 9
Cables all of the same diameter, formed around a central single core follow the "rule of 6"
the first layer is 6 plus the inner core is 7 (the 7 wire assembly  is 3 cable diameters in diameter)

the second layer  contains 6+6 plus the 7 below it, so it has 19 total cables and is 5 cable diameters in diameter.

The third layer is 6+6+6 or 18 cables plus 19.... and so on

hopes this helps

Wilber

RE: FORMULA TO CALCULATE DIAMETER OF BUNCHED ELECTRICAL CORES

If all the strands are the same diameter it is very simple.

D = d*(2*LAYERS-1)
with d the strand diameter & LAYERS the number of strand layers. Typically the number of strands N equals
N = 1+3*LAYERS^2-3*LAYERS.

For example a N=37 strand cable with d=.1466" has
LAYERS = 4 because  37=1+3*4^2-3*4, and
D = .1466*(2*4-1) = 1.0262" the outter dia of the cable.

John Alexiou
Alcoa - SAG10/Vibrec Development.
john.alexiou@alcoa.com

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