Page 951 - Industrial Power Engineering and Applications Handbook

Carrying power through metal-enclosed bus systems 28/901
Relevant Standards

IEC Title IS BS IS0
6005911999 Standard current ratings (Based on Renald series 311973
R-10 of 60-3)
60439- 111992 Low voltage switchgear and controlgear assemblies 8623-111993 BS EN 60439-
Specification for type-tested and partially type tested 111994
assemblies
60439-2/1987 Low voltage switchgear and controlgear assemblies 8623-2/1993 BS EN 60439-
Particular requirements for busbar trunking systems 211993
Hexagon head bolts. Product grade C 1363- 111 992 BS EN 2401611992 401611988
Hexagon head screws. Product grade C 1363-211992 BS EN 24018/1992 40 1 811 988
Hexagon nuts. Product grade C 1363-311 992 BS EN 24034/1992 4034/1986
Hexagon head bolts. Product grades A and B 1364-111992 BS EN 24014/1992 4014/1986
Hexagon head screws. Product grades A and B 1364-211 992 BS EN 2401711992 401 7/1988
Hexagon nuts, style 1. Product grades A and B 1364-3/1992 BS EN 2403211992 4032/1986
Hexagon thin nuts (chamfered). 1364-411992 BS EN 24035/1992 4035/1986
Product grades A and B
Hexagon thin nuts. Product grade B 1364-5/1992 BS EN 2403611992 4036/1979
Mechanical properties of fasteners 1367-3,6,20 BS EN 20898-1,2,7 898-1,2,7
Interconnecting busbars for a.c. 8084-1992 BS 159/1992
voltage above 1kV up to and including 36 kV
Criteria for earthquake resistant design of structures 1893/1991 DD ENV 1998 (1 to 5)
Plain washers 2016/1996 -

Relevant US Standards ANSWNEMA and IEEE
NEMA L11/1983 Industrial laminated thermosetting products
ANSYIEEE Metal enclosed bus and guide for calculating losses in isolated phase bus
C37.23/1992

Notes
1 In the tables of Relevant Standards in this book while the latest editions of the Standards are provided, it is possible that revised editions
have become available. With the advances of technology and/or its application, the updating of Standards is a continuous process by
different Standards organizations. It is therefore advisable that for more authentic references, readers should consult the relevant
organizations for the latest version of a Standard.
2 Some of the BS or IS standards mentioned against IEC may not be identical.
3 The year noted against each standard may also refer to the year of its last amendment and not necessarily the year of publication.
= It300 x 300 x 600

= 1.26 x 300
= 378 mm
:. RaCB5 = Rdd5 = 13.97 pQlm Corresponding to this, the reactance from Figure 28.19(b)
can be determined by extrapolation. We have assumed it to
= 0.01397 QAOOO m be 0.06 R11000 m per phase.
For proximity effect:
Impedance Z= ,/0.01397' + 0.06'
141.3
128.2
From Figure 28.21 5 = - A -
r, 2 ' 2 = 0.061 6W1000 m
= 0.907 Voltage drop for 50 m length in phases R and B
Corresponding to this Ds/r, = 0.967
50
= 2500 x 0.0616 x -
141.3
:. D, = 0.967 x - 68.3 mm 1000
=
2
= 7.7 v
and se = qSAB 'SBC '&A which is only 1.86% for a system voltage of 415 V, and is
(refer to Figure 28.39) satisfactory.