Do 2-phase (split phase) lines ALWAYS need to be switched together?

[Knobhead]

Sorry Bill, just lately we’ve had lots of resurrected threads and they tend to confuse things.
Split phase supplies can be a bit of a minefield, I got used to them working in quarries 40 odd years back.
There has been a resent thread about them, which is a bit weird in the way the DNO have done it.

 

[reelectrics]

tt system on a farm what advice would members give on fitting 300ma rcds on a split phase supply looking at pv install so type a rcd required.regards

 

[netblindpaul]

180 deg split phase?

 

[Knobhead]

0° centre tapped is normal. 180° will give 0V phase to phase and the neutral would have to be 2X phase CSA conductor.
It could be a Scott or LeBlank 90° connection

So what voltage does the PV system work on?

 

[reelectrics]

single phase inverters 3.6kw tl fitting two each protected by 100ma rcd type A, farm install.treating the install as two seperate installs g83 settings so 240v nom 1%vd design swa cable regards

 

[Knobhead]

If you are going to be feeding in to the network then you could run in to problems with 230V.
You would effectively be feeding in to only ½ of the transformer winding, it won’t be happy, neither will the DNO!

I have sent you a PM