Products > Test Equipment
Average measuring multimeters more precise than TrueRMS counterparts?
Electro Detective:
--- Quote from: HKJ on January 29, 2023, 09:57:29 am ---
You can easily get 320V or more (in 230V countries) if the neutral wire is broken.
--- End quote ---
Good point although I can't see that happening easily in a single phase domestic zone,
unless there is a 3 phase supply out in the street feeding it,
and anything goes with a neutral loss and or earthing/ground fault :scared:
HKJ:
--- Quote from: Electro Detective on January 29, 2023, 10:09:32 am ---Good point although I can't see that happening easily in a single phase domestic zone,
unless there is a 3 phase supply out in the street feeding it,
and anything goes with a neutral loss and or earthing/ground fault :scared:
--- End quote ---
In Europe a 3 phase distribution to each building is fairly common (I do not know the system in Ukraine).
And you do not need a war to get these faults, just a electrician that is a bit sloppy.
Kleinstein:
A neutral loss can also happen with a "single" phase system. The 110 V is in many areas 2x110 V - so that 220 V is also available if needed or after a fault.
radiolistener:
--- Quote from: Electro Detective on January 29, 2023, 09:40:20 am ---320 volts reading on an averaging meter or RMS?
Analogue or digital meter?
Peak readings perhaps?
--- End quote ---
It was shown on protection switch in electrical switch box, which probably using some kind of averaging meter. With normal Voltage it shows about 220 Volts.
--- Quote from: Electro Detective on January 29, 2023, 09:40:20 am ---Is it 320 volts in a 120v area
or 220v ?
or 230/240v ?
--- End quote ---
This is for mains with standard 220 Volts 50 Hz.
Usually, when all is ok, Voltage varying from 220 to 240 Volts during the day, sometimes up to 250 Volts.
But when something goes wrong, it can easily go below 190 Volts or above 250 Volts.
As other mentioned above, when neutral line is broken you can easily get 380 Volts in your home mains socket (difference between two phase lines which is connected to a load with shared neutral line).
--- Quote from: Electro Detective on January 29, 2023, 10:09:32 am ---Good point although I can't see that happening easily in a single phase domestic zone,
--- End quote ---
Multi-storey buildings have 3 phase power supply, phases are distributed between apartments. And broken neutral line happens pretty often under heavy loads.
robert.rozee:
here in new zealand, 230v 3-phase is distributed to residential areas, with each house fed with a single phase so that every 3rd house down the street shares the same phase. the neutral wire is then considerably lighter gauge, as along the street the neutral current sums towards zero. this saves considerably on the quantity of copper in the network.
as a result, a short between neutral and one phase may cause a (hopefully brief) drop in voltage to 1/3rd of the houses in the vicinity, and a rise in voltage to the remaining 2/3rd. in a war zone, where multiple dwellings are impacted in quick succession, i could see this creating severe problems.
cheers,
rob.
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