3 phase changeover

[GCE]

Morning All

I have a comment about automatic changeovers.

The regulations clearly state that in a three phase installation all phases and neutral shall be switched with regards to alternative supplies I have yet to see any automatic changeovers do this.

Referring specifically to generators , the 4 pole change over has been in the majority of Municipal bylaws for years and an Eskom bylaw .I found my 1991 application to register with Eskom as a contractor which stated 4 pole change over on all installations.
The 4 Pole change over was written into SANS 10142-1 in 2003 and has also been there in the form of "you may not earth the neutral after the point of control". Sans 10142-1 clause 6.1.6

Inverters/UPS do not need a change over switch but they do show a bypass switch - Nowhere do I find that a bypass switch shall be used - Seems like an optional

But yet the supplies of change over switch inform me that here are more 3 pole switches sold then 4 pole. Shows you how many contractors/ consultants do not keep up to date .