IEC TR 60649:2007 pdfダウンロード

IEC TR 60649:2007 pdfダウンロード。Calculation of maximum external diameter of cables for indoor installations
1 Scope
This Technical Report gives guidance for calculation of the overall cable diameter according to the structure and the dimensions of the cable elements.
2 Terms and definitions
For the purposes of this document, the following terms apply.
2.1 General definitions
2.1.1
single conductor
solid conductor
2.1.2
solid conductor within the stranded conductor
strand
2.1.3
stranded conductor
group of assembled strands
2.1.4
cable element
conductor, pair, triple, quad, quintuple or other structure. It may be screened or unscreened
2.1.5
solid conductor shape
circular
2.1.6
all dimensional values are nominal
2.2 Notation
2.2.1
diameter of solid conductor, d
2.2.2
diameter of concentric-lay stranded conductor, d s
2.2.3
diameter of non-concentric-lay stranded conductor, d ns
2.2.4
total number of strands in a stranded conductor, N s
2.2.5
number of lays in a concentric-lay stranded conductor, n
2.2.6
diameter coefficient for non-concentric-lay stranded conductor, k ns
2.2.7
nominal insulation thickness, d i
2.2.8
tape thickness, d t
2.2.9
braid wire diameter, d b
2.2.1 0
assembly coefficient, K a
2.2.1 1
cable element diameter, d a
2.2.1 2
core diameter, d core
2.2.1 3
sheath thickness, d sh
3 Equations and method for calculations
3.1 Diameter of stranded concentric-lay conductor
Stranded concentric-lay is made up of 7, 1 9, 37, 61 , 91 or 1 27 strands. Each strand has diameter d. The strands are arranged in layers.
For this case N s can be calculated from equation (1 ).
And d s from equation
d s = (1 +2n)d
3.2 The diameter of stranded non concentric-lay conductor can be calculated by equation (3) and Table 1 , as follows:
d ns = k ns d