New SANS 10142-1:2021 (ed. 3.o1)

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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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6.2.7 Voltage drop
6.2.7.1 Difference in voltage (voltage drop)
6.2.7.1.1 When all conductors of an a.c. installation are carrying their design
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 or declared voltage. (See 5.3.2, 5.4.2 and annex D.)
6.2.7.1.2 In the case of a 230/400 V system, the voltage drop for single-phase
circuits shall not exceed 11,5 V (5 % of 230 V) and the voltage drop for
three-phase circuits shall not exceed 20 V (5 % of 400 V). Amdt 1
6.2.7.1.3 In the case of single-phase circuits derived from three-phase
supplies with balanced loading, the phase-to-neutral voltage drop is calculated
from three-phase values divided by
3 . Amdt 1
6.2.7.1.4 For multiple installations connected in series (for example housing
schemes, etc) refer to 5.4.2 for overal voltage drop requirements. Amdt 1
NOTE 1 If the phase-to-neutral voltage is not declared, the value can be calculated by
dividing the phase-to-phase voltage by 1,73.
NOTE 2 Deleted by amendment No. 1.
6.2.7.1.5 When all conductors of a d.c. installation are carrying their
maximum estimated load, the difference in voltage (the voltage drop) between
any point of supply and any point of consumption shall not exceed 5 % of the
circuit nominal voltage or shall comply with the requirements of the
manufacturer of the equipment connected to the circuit. Amdt 1

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6.5.2.2 Electrical continuity
Rigid metallic wireways shall be electrically continuous and be connected to
earth as close as possible to the source. Amdt 1

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Table 6.22 is also marked as an amdt 1 ...it looks like they fixed the table which was missing 4 mm/16mm/50mm

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NOTE It is recommended that earth leakage protection be installed in all circuits
that supply socket-outlets in existing installations prior to earth leakage becoming
compulsory. Amdt 1

6.7.7 External lightning protection
NOTE Where external lightning protection is installed, it should be in accordance with
the requirements of SANS 10313. Amdt 1

6.12.1 Earth continuity conductors
6.12.1.1 An earth continuity conductor shall
a) consist of compatible conductors,
b) if it forms part of a cable other than a flexible cable, comply with the relevant
requirements of the standard for the cable,
c) if it forms part of a flexible cable, be of the same material as, and have a
nominal cross-sectional area at least equal to, that of the largest phase
conductor,
d) be able to carry the prospective fault current without excessive temperature
rise of the conductor, within the disconnecting time,
e) if it does not form part of a cable or flexible cable, have a nominal
cross-sectional area in accordance with table 6.25 and if it equals to the
phase conductor size refer to table 6.28(a), as follows: Amdt 1

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table 6.2.8(a)
(3)

Table 6.2.8 (b)
(h)

6.14.1.6 In a lighting circuit, a luminaire may be fed from a socket-outlet on a
wall (that may be unswitched), provided that the socket-outlet
a) complies with SANS 164-3 or SANS 164-2-1 (partially dedicated
socket-outlet), Amdt 1
b) is protected by earth leakage protection, except in the case where
SANS 164-2-1 (partially dedicated socket-outlet) socket outlets are fitted,
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6.16.3.3.1Stove connections shall be connected by either 6.16.3.3.2 or
6.6.3.3.3. Amdt 1

6.16.3.3.3 The stove connections may be wireddirectly between the isolator
and the stove terminals, by means of a flexible arrangement, which are
mechanically secured and be terminated on either end. When the stove is
removed, the final section of hard wiring to the stove terminals has to be
removed and made safe. Amdt 1

7.16.3 Voltage drop
The designer of the distribution system shall select the components in order
to ensure a minimum voltage drop over the system, which will allow for the
voltage drop over the entire installation, which is the distribution system, not
to exceed the 5 % of the circuit nominal voltage (see 6.2.7) and maintaining
the overall voltage requirements in 5.4.2. Amdt 1

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NOTE 2 In South Africa, it is a statutory requirement that an approved Inspection
Authority (AIA), or a defined competent person, or a person registered in the
professional category in terms of the relevant national legislation (see foreword),
ensures compliance from commencement to commissioning of an electrical installation
where the intention is to supply five or more users from a new point of supply (see the
relevant national regulation (see foreword)).
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8.1 Inspection and tests
Section 5 of the test report provides for the person who carried out the
inspection and testing of the electrical installation as given in 8.5 and 8.6, if
the results are acceptable, to verify that the installation complies with the
requirements of this part of SANS 10142.
NOTE If the test report covers an installation in South Africa that existed before the
publication of this part of SANS 10142 and extensions or alteractions made since then,
both blocks that refer to installations which existed before and after the publication of
this part of SANS 10142 should be marked.
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NOTE 1 This calculation gives practical and conservative results. Amdt 1
NOTE 2 The return current path impedance should be considered where applicable
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8.5.2 Complete the inspection table in the test report by confirming the
statements in item1) to 4) with "Yes" in the appropriate block. "No" answers to
the following statements will prevent the issuing of the report:
a) conductors are of the correct rating and current-carrying capacity for the
protective devices and connected load,
Pay attention to voltage rating, voltage drop, current-carrying
capacity and short-circuit capacity.
b) components have been correctly selected and installed, and are accessible
where necessary, Amdt 1

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8.6 Testing
Certain tests shall not be carried out in hazardous locations. Due to the
characteristics of the intrinsic safety features of equipment, such
equipment can be damaged by certain tests. Certain tests might be
impractical in existing installations already under power.
8.6.1 General
NOTE Conduct all tests and complete a copy of the test report for each distribution
board and supply (normal and alternative supplies). Amdt 1

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For the testing of installations that are fully or partially in hazardous or
specialized locations, see the relevant standards, and complete the additional
report(s) (see 8.7 for hazardous locations) and the SANS 10142-1-1 test
report for medical locations. Amdt 1