can you explain how it's wired up a bit more ? maybe some more photos ?
we're assuming they're 240v elements... so there's a phase feeding into one end of the elements and the other ends are all connected together
yes :-)
I'm guessing a lot here because just going by photos... can you see/photo where the other ends of the wires go ?
there's 5 mounts with 2 elements each, so 10 elements total... only use 9 of them, that way the 3 phases will balance out
(looks like it was that way before too?)
looks like you have 3 x 4 core wires coming in - so that's 3 phases and an earth ? (check this)
are they already wired up with one end linked up? - tricky to tell from photos, it looks like they could be ?
if those are 3 phases in each cable coming in, then when you wire them to elements, the other ends of those 3 should be joined together - copy that
(this stops you overloading any of the joining wires... if you joined all of the 1st phase negatives together, then joined them to the 2nd phase negatives you'd need a really thick wire between them... if you know what I mean ?
you can join all 9 together... but it's probably easier to do them in sets of 3
because it's AC, the positive is really going positive/negative/positive/negative... switching from one to the other 50 times a second
so when one of your 3 phases is positive the other two even out as a negative
I said do sets of 3, because if you had a wire jumping from each negative connection to the next, you'd want to do a phase1 negative then a phase 2 etc..
I was worried you might do all the phase 1 negatives then the phase 2 negatives... which would mean the wire going between then would be carrying the current of three heaters instead of one
you can do it with one wire connected to all nine, just do phase 1, then phase 2, then phase 3 and back to 1