Hi

You would think with the regulations and definitions that the answer would be str forward -

With the definition of electrical installation in the front of Sans 10142-1 , and you add "new" in front of electrical installations as written in 6.15.1.1.1 and you have an answer .
To me the English says any new piece of installation that gets done in an existing premises needs to have a euro socket.There should actually be no use for an Old single or Duo Socket anymore.

I have seen the different interpretations and still struggle to see why there are different interpretations

3.33
electrical installation
machinery, in or on any premises, that is used for the transmission of
electrical energy from a point of control (see 3.56) to a point of
consumption (see 3.55) anywhere on the premises, including any article
that forms part of such an installation, irrespective of whether or not it is part
of the electrical circuit, but excluding
a) any machinery of the supplier that is related to the supply of electricity on
the premises,
b) any machinery that is used for the transmission of electricity of which the
voltage does not exceed 50 V, where such electricity is not derived from
the main supply of a supplier, and
c) any machinery that transmits electrical energy in telecommunication,
television or radio circuits

[I]6.15.1.1.1 Except where otherwise specified in this part of SANS 10142,
single-phase socket-outlets for general use (see also 6.14.1.4) shall
a) be of the two-pole and earthing contact type,
b) comply with SANS 164-0,
c) effective from January 2018 all socket-outlet points for new electrical
installations shall include at least one socket-outlet complying with the
dimensions of SANS 164-2. Socket-outlets points may also include
socket-outlets complying with the dimentions of SANS 164-1.[/I]