Gobokat
Active Member
The second part is correct, ALWAYS measure leg to leg, and legs to neutral (and I also do legs to ground)
BUT, the first part is incorrect. (which is why we always measure)
On more than one occasion, I have seen 5-cam outs as high leg delta... 240v phase to phase, 208 phase to neutral on one leg, and 120 phase to the other two legs.
By code, the 208 leg cam would be orange instead of red, but can often be hard to discern.... and not everyone follows code... especially with older installs.
two of the times I ran into this issue were rental generators and transformers, where the transformer had been configured as high-leg, but was not marked.
The third time was a TV gig in an old warehouse that had used high-leg for the previous tenant, and we were the first production in the space.
This is why I did say that in any installation outside of an actively running theater-only complex to not ever assume the electrician before you knew or cared about the difference between delta and Wye.
You are correct that certain industrial/entertainment generators which are field switchable between 208/240 will have the 5 standard Wye cam outs presented, the installed panels I've seen will only have the Blk/Red/blu/wht/grn in the Wye service installations.
As far as measuring the outputs it is a good idea, and I did neglect, to mention leg to ground - but also neutral to ground to be sure you don't have a floating neutral system.