3.31
electrical consultant
person who is registered in terms of the relevant national legislation
(see foreword) Amdt 1
Distribution boards ≤ 10 kA short-circuit current low-voltage
switchgear and controlgear
Assemblies > 10 kA
For outdoor use and exposed to public
Assemblies for construction sites
SANS 1973-3
SANS 1973-1 or SANS 61439-2
SANS 61439-5
SANS 61439-4
5.3.2 Voltage drop
5.3.2.1 When all conductors of an a.c. installation are carrying their maximum
estimated load, the difference in voltage (the voltage drop) between the point
of supply and any point of outlet or terminals of fixed appliances shall not
exceed 5 % of the standard voltage or of the declared phase-to-neutral
voltage (see also 6.2.7).
f) where the distribution board is concealed by a cupboard or other covering,
the notice for live electrical apparatus referred to in annex N shall be in a
conspicuous place indicating the position of the distribution board.
5.4.2 Voltage
The equipment shall be suitable for operation on the maximum steady (r.m.s.)
voltage and overvoltage to which it is likely to be subjected. Equipment shall
be rated in accordance with the intended application for use on one of the
following voltages used in South Africa:
a) A.C. circuits:
1) standard voltages at a point of supply of Amdt 1
6.2.3 Basis of tabulated current-carrying capacity
6.2.3.1 The current-carrying capacity of conductors and cables set out in this
clause takes account of IEC standards, where applicable. For types of cable
not covered in the relevant IEC publication (for example, armoured cables)
the current-carrying capacity given in this clause is based on data provided by
the relevant national association (see foreword). Amdt 1
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