Having just tried to memorise SANS 10142, I can confirm

6.7.5.5 The following do not need earth leakage protection:

..

d) a stove coupler that complies with SANS 60309-1/IEC 60309-1 and of
dimensions as given in SANS 337 (see 6.15.1.2.5). Amdt 5


What exactly this makes in terms of nullifying the need for protection I cant say.