Left or right-handed current / Which phase is which?
Hello,
The following situation: For a conversion, the three phases L1, L2, and L3 are required. At the main distribution box in the house, the three phases L1, L2, and L3 are individually protected by main fuses.
If these fuses are individually switched off, the corresponding phase will go out on the electricity meter's digital display. (This should theoretically be the correct connection, as this connection is sealed by the utility company.) The voltage of the individual phases can also be checked after the electricity meter; everything is plausible and apparently correct!
Better to be on the safe side. So I tested the rotating field with a Duspol from Benning: (new, analog, not used before)
Strangely, the following results:
"L1-" on L1 against "L2+" on L2 (as in the picture above, "R" should indicate clockwise rotation, but "R" never appears in any of the measurements)
However, it is measured the other way around:
"L1-" on L2 versus "L2+" on L1 etc. always appears an "R"
According to the measuring device, L1 and L3 would have been swapped by the network operator.
Finally to the question:
Am I too stupid?
Switch box connected incorrectly?
Meter incorrectly labeled or intended for GB/Ireland?
(1 votes)
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The device will probably be fine, and the network and measuring conditions for two-pole measuring devices are probably correct.
Therefore, there is definitely a possibility of a phase swap within the installation from the house connection to the main distribution.
When it comes to home installation, it doesn't matter whether you have a counterclockwise or clockwise rotating field. You can test the phase position beforehand, but it's not necessary. Only the individual phases with 230 V to neutral are needed anyway.
If a three-phase socket (400 V phase to phase) is installed somewhere, you simply have to swap a pair of phases in the CEE socket to create a clockwise rotating field.
Thanks for the answers, I have now made a counter test with the measuring device on a system where the phases are definitely installed in clockwise rotation – with the same result, so the phases are swapped
During installation, it was important to me that the cable colors should also be correct once installed
Have you measured whether the contacts on the socket match the phase designations, i.e. fuse 1 removed, then L1 on the socket should be dead, as should fuses 2 and 3. If that is not the case, the supply line to the socket is swapped.