We can be sure you don't, then.
It's "none of them knows...".
It's "none of them knows...".
Upgrade to 3 phase
- Thread starter SUNRAY
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Is that not what I stated?
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Yes, didn't realise you were talking about a ficticious circuit.
Oh no, most deffo not fictitious.
Oh my education is incomplete, where could I expect to find that arrangement?
Neutral is frequently not included for industrial installations of motors, heater batteries, transformers etc.
I have worked in some big control panels where neutral is not even brought into the enclosure, any kit requiring 240V, 110V or 24V being transformed from 400V across 2 phases.
3ph immersion heaters are often 400V elements.
My mistake, my education was complete, and I was right you described a fictitious circuit that has never existed because it would never work.
Because it is not required.
So what do they do with it, just leave it hanging around?
Because it is not required.
So what do they do with it, just leave it hanging around?
Can you do me a favour and recheck your post for mistakes because as it is it doesn't make any sense.
Makes sense to me, but you said "where neutral is not even brought into the enclosure", what does that mean?
It means that the supply to the device consist of only L1, L2, L3 and earth with no neutral [#2 drawing]
Edit: sketch of a starter panel with no neutral, transformer sits across L1 & L2
Last edited:
But I have never mentioned #2 sketch, only ficticious #3 sketch
You see when you said "I have worked in some big control panels where neutral is not even brought into the enclosure" that meant to me that a tp&n supply was taken to the enclosure, but the neutral was not taken into the enclosure, just left hanging around outside, like #3 sketch.
Is there something unusual or interesting about that sketch?
I was replying to this:
Lets get this straight, none of the sketches are fictitious, they all have perfectly valid uses somewhere, I have even seen the neutral run through the RCD in the opposite direction to make it super sensitive to unbalanced phases. and ditto with an earth wire to monitor earth fault current.
which relate only to #2, ie no neutral
Lets get this straight, none of the sketches are fictitious, they all have perfectly valid uses somewhere, I have even seen the neutral run through the RCD in the opposite direction to make it super sensitive to unbalanced phases. and ditto with an earth wire to monitor earth fault current.
#3 has nothing 'left hanging around outside', it is drawn to indicate a 3ph&n supply where the neutral is not wired through the RCD but otherwise a full 4 wire circuit.
No not unusual but hopefully interesting to demonstrate an application of #2 'neutral not taken into the enclosure'.
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