Questions tagged [neutral]
a circuit conductor that normally carries current, and is connected to ground (earth) at the main electrical panel.
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Is touching a neutral wire safe?
Yeah, I know, it is such an old question, so many discussions on this topic, but I cannot realy find an exact answer in the Internet.
I live in Ukraine, where we have 230V AC outlets, as in most ...
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Using central heating pipe to detect neutral line with a multimeter
I'm exploring the capabilities of my cheap Aneng SZ08 multimiter, which I've recently purchased. I have a question related to the detection of a neutral line in the wall socket using a multimiter. ...
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Neutral grounding resistor
How does neutral grounding resistor in power generation side, see and link up with grounding fault at the secondary side of a transformer?
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Abnormal Neutral to Earth and Phase to Earth Voltage in Generator [closed]
We have a 5 KVA Diesel Genset with a 220V AC Output. Also, we have a single phase 220V AC Mains Supply. The genset is connected to a dedicated ground pit with a 10 mm Cable. We have checked the ground ...
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Hooking up a NEMA 14-30 male to NEMA 5-15 female
From the hardware store I bought a NEMA 14-30 power cord, to which connected a NEMA 5-15 receptacle so I can plug in a 240V appliance.
https://www.amazon.ca/AC-WORKS-Generator-250Volt-Flexible/dp/...
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Do neutral wires go back to transformer via ground?
I have heard that transformer connects to house only via phase(s) - neutral from house is actually grounded, as well as transformers and they connect via earth. Is this true? What is resistance of ...
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How can a failed furnace blower motor damage other equipment on a shared neutral? [closed]
Story time: Last week my furnace failed. The blower motor run capacitor went toast, so the motor wouldn't spin. The furnace is on a multi-wire branch circuit and shares its neutral with the basement. ...
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Correct configuration for adding an earth terminal block?
I have a small motor controller test board setup like the diagram below:
A few loads such as a motor controller, and some switches are connected to the live and neutral terminal blocks for power. ...
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Is there any way to easily gain access to "actual ground" in an IT grounding system?
As the title asks, is that possible? By "easy access" I mean through some connection I can find inside my home, rather than burying my own grounding electrode and running wires from it to ...
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How do I configure a Siemens protection relay for ground/neutral protection with no neutral current transformer?
On a 35kV 3phase system, we have no neutral connection from the incoming delta/wye transformer. The wye is only connected to a high resistance ground system.
We have a current transformer (CT) for ...
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Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
I work in manufacturing with Toshiba extrusion machines which are controlled by PLCs. Our management wants to add a ...
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Can I get a neutral from a three-phase supply using a step-down transformer (415 V to 230 V)?
I have a three-phase supply voltage, between them is 415 V.
Can I connect a 415/230 V step-down transformer between any two phases and use the output of the transformer as phase and neutral?
Or ...
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50 Hz and 60 Hz combined neutrals [closed]
I have two inverters. Inverter A is producing 220 V, 50 Hz while inverter B is producing 110 V, 60 Hz. Can they share a neutral on the output?
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How can earth be connected to neutral?
I recently installed a solar inverter in my house and learned that earth must be connected to neutral. I am very puzzled by this, since AC changes direction of current flow, so according to me, there ...
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Inverter causing RCD to trip
I have an offgrid inverter/charger - an MPPSolar PIP4048MS (4000W inverter, 48V system). By and large it has worked well for 7 years.
Recently I bought an MPPSolar PIP5048MS (5000W inverter, 48V ...
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Using the neutral wire for data transmission
I know this is a bad idea, but that does't mean I don't want to try it.
Powerline networking is a thing. It could well be they do this in the way I'm considering, but I'd imagine they probably ...
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Can I drive a 3-wire-delta-input appliance with a wye-output transformer?
We have a high-current industrial machine rated for 3-phase at 230 V; the nameplate literally says "PHASES: 3Ph + PE", "VOLTAGE: 3X230VAC", and "FULL LOAD: 92A".
There ...
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What is the purpose of the 1 Mega-ohm 1/2 watt resistor between neutral and ground, in a vintage audio amplifier (SONY model STR-7800SD)
I own an old SONY radio / amplifier, model STR-7800SD. I opened it and I saw a resistor between one of the AC lines and the chassis. The funny thing is that it has a REVERSIBLE 2-prong plug! So, I ...
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Formula for calculating the current in the neutral of an unbalanced 3 phase system
Morning All, my first post here! I am looking at 3 phase calculations and how to find the current in the neutral for an unbalanced 3 phase system. I am aware that it can be drawn out to find the ...
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Difference between phase and polarity?
Long story short, I did a bit of a career change, I'm now doing electrical engineering with an architecture firm instead of embedded systems. So I've jumped from the simple world of DC to the land of ...
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Do devices not tolerating swapping live and neutral exist?
Multiple types of domestic power sockets around the world (including the ones in my country) do not distinguish between live and neutral even when ground is present.
I am shopping for an AC-DC PSU ...
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Why use vector sum for calculating neutral current?
In a three phase system, we use a vector sum to calculate resulting neutral current.
I don't understand why we use vector sum. The resulting neutral current is actually the sum of instantaneous values ...
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Why is the fuse connected to the live wire?
As far as I can understand the concept of AC, it does not matter which wire is live or neutral as this changes like 100 times per second (implying 50Hz) I believe.
I read the fuse must be connected to ...
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Is it correct to connect the grounds of high-power and low-power switched-mode DC supplies?
I want to control some WS2811 lights with a Raspberry Pi.
The lights need 24V ~180W ~8A from a supply such as this, whereas the Pi wants 5V and presumably low power from a supply such as USB. I ...
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LED Wall neutral current problems
I’m running a film project that involve a huge Led wall.
I have 1000 screens that can pull .6 amp each they are balanced for load on a 400amp 3 phase supply but I’m measuring the same current in the ...
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Using mains in a project with just a power cable (ground wire)
I'm going to power a 235 V band heater with a computer power cable (has fuse, SSR and thermocouple, too.) Everything is enclosed within a box, and there are no open junctions etc. I am unsure what to ...
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Current measurement in LTSpice
In LTSpice, measuring a current through passive elements (components) is very straightforward. Now I'd like to measure a current through a neutral wire where no element is connected to it. So can ...
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SVPWM: space vector generation star point shifting - effects?
I keep seeing that the space vector generation (as a part of a FOC) is generated around DC Link / 2. What effects would be expected if the (in this case isolated) star point were permanently shifted?
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burying the neutral to used less cable for welding a long way from the power source
Of course we are not talking about code or best practice, but hypothetically if someone wanted to do some welding a few hundred meter from the closed power point could he/she run one hot conductor to ...
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Energy meter neutral current measurement
I was reviewing an energy meter specification and I came across neutral current measurement.
What is the importance of neutral current measurement in an energy meter for three phase power supply?
I ...
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How does a single phase shared neutral circuit actually work, physically?
Okay so this is a two part question. First Question is probably more of an ELI5 question. But I am a fairly experienced electrician (NOT AN ENGINEER mind you.) but I have a generally good working ...
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How to check if Neutral is grounded properly?
I was thinking of buying a Residual current device but I don't know if the power supply to my home is grounded properly or not. For initial testing I used my multimeter to check the voltage coming to ...
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How does leaving the neutral line not connected to device lead to burn it? [closed]
When an air conditioner (inverter AC) connected to the source 220V/50 Hz the circuit breaker became off and each time I tried to make CB on it returned to off directly.
After the maintenance center ...
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Is high earth to neutral voltage in single phase power supply system indication of high earth resistance?
In a single phase power supply system, if I measure the earth to neutral voltage, can I use it to indicate the health or status of the earth resistance i.e. if E-N voltage is high, is it due to earth ...
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How to connect live and neutral and earth connection in AC devices plugged into socket?
I know that when I have a fixed lamp in my house I have to use a single switch on the live wire. But when the device is connected using a plug the live wire and the neutral wire vary depending on how ...
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Would a person receive a shock/risk death if they completed two ends of a neutral wire?
I know this seems like a silly question but I'm trying to make sure I understand the neutral wire. So I know if someone touched a neutral wire (assuming everything is wired 100% correctly) carrying ...
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How a high Earth to Neutral voltage affects electronic equipment like L2 or L3 switches? [closed]
We have lot of communication equipment installed recently in our organisation. From then, lot of pressure on us to reduce Earth to Neutral voltage at the input of our communication equipment like L2 ...
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Why do we connect neutral and ground at the transformer? [closed]
Why do we connect neutral to ground at the transformer, why can't we just connect that neutral to the ground at our house?
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What's the use of neutral wire in single phase home supply? [duplicate]
I am aware that the neurtal wire provides a return path for the current to the power source. But that neutral wire too, is connected to the ground at somewhere between the load and the source.
My ...
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Switch type for electrical generator bonded to floating neutral
I have an electrical power generator and for it to properly work with it connected to the house it must be converted from bonded neutral to floating neutral according to these instructions. I was ...
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Connect the oscilloscope to equipment with a common neutral and ground
I watched a video. At 3 minutes, the situation is shown when neutral and ground are joining. Why can this be dangerous? If we are talking about an oscilloscope, the crocodile must already be connected ...
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Running long underground line without neutral or safety ground using transformer, is it to code?
My prior question asked about a single wire earth return [SWER] system. Both questions are aimed at meeting the same end requirement but this is a sufficiently different method that many of the issues ...
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What are the reasons behind marking neutral and line terminals on a power supply AC input?
Even though AC has no polarity, almost all the power supply AC inputs or most AC powered device input terminals indicate line and neutral terminals as L and N just like in the following example:
Is ...
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Wiring 3P+N Device to 3P+N+E Connection
I have a 415V compressor with a 3-phase Commando plug in the configuration 3P+E, however my wall socket is 3P+N+E. Is it possible to change the plug on the compressor to a 3P+N+E without connecting ...
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Running a long 120VAC line without a neutral
Source is a home 120/240VAC with pole transformer. I want to direct bury a 500 foot 120V line to run some battery chargers and dont need more than 10 amps. Why cant I only run a single large ...
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Role of the neutral conductor in three phase systems
In a symmetrical and balanced three phase system no current flows on the neutral conductor.
Obviously the real electric power distribution systems are not perfectly balanced, so there is a current on ...
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What does it mean when my car inverter's labeling says "Neutral Floating"? Is it safe to use?
I recently came across a fairly old car inverter. It plugs into a 12v DC lighter socket, and outputs 115 Vac at 60 Hz, and has a normal American outlet on the side of it (with a ground pin, which ...
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L and N switched, from a functional point of view, what difference does it make for the device being powered?
Consider a generic single phase AC 240 V (or 125V) device for home use such as a hair dryer.
From a purely functional point of view, what difference does it make if a phase is switched with the ...
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Designing PCB with AC Live and Neutral on two layers
I'm designing a smart socket that will route 240V AC Live and Neutral to a voltage regulator and also to a relay that will control the current flow. Due to the limited space, it will be easier to ...
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How can a circuit not have a neutral?
I've been making plans to install a NEMA 6-50 outlet in my garage, but I don't understand how it can not have a neutral, and instead have two hots (at 120v each) and a ground.
What completes the ...
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