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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400v on 240v system with 60v with earthing leak on [closed]
I have a 240V system, but when probing phase-neutral i receive 60v, at the same time if i probe phase-ground i receive 240v. However when the earth leaking is tripped i receive 400v on phase-neutral ...
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If AC is alternating (+120v) - (-120v) then why we don't get shock by touching neutral wire
If AC is alternating the current between phase and neutral then why we don't get shock by touching neutral wire?
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Will this circuit design completely isolate the power company from a house?
In an earlier post, I asked for a circuit design that would keep the coax shield from becoming the neutral back to the transformer in the case of a broken power company neutral. There were some great ...
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Can't the electric current returning from the neutral end of the electrical cables be used again?
I am someone who has little knowledge about electricity, but I have something I am curious about. I could not find the answer by searching on the internet.
If the electric current comes from the phase ...
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Circuit design to prevent the coax cable from becoming the neutral back to the transformer from the house
A 240v line runs to a house from an autotransformer operated by the power company, and a coax cable makes the same run. At the pole the coax shield is connected to the floating ground of the ...
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Transformer Input Wiring Question
I apologize for the basic question, but I just bought a transformer with the following specifications. On the input side, there are two black wires and two red wires. Here is a photo.
And here the ...
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A basic question about line and earth wires on a power plug
Please refer to the following drowing:
Imagine from utility to the electrical outlet we receive line, neutral and earth as shown above in Figure 1. This is connected to a device such as a power ...
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MCP39F521, a Triac (T610), Load on Neutral & Measuring V and I
I'm trying to build a AC “power bar” with metering per “outlet”. The 2 most interesting chips I found are the Microchip MCP39F521 and the Allegro ACS37800. Due to costs, I've chosen the former. The ...
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Why Does Current Flow Through the Neutral in a Wye Transformer Secondary?
I'm trying to understand the behavior of current in the neutral wire of a wye (Y) transformer secondary (EU residential wiring). Specifically, I'm curious about the following points:
Does the current ...
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I have so many questions about this method of grounding in this video? [closed]
https://www.youtube.com/watch?v=G8JgS-STozA&t=537s
First, I apologize this video is in a different language, but I'll point out what is relevant.
So, in this video. There is a man saying that his ...
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Does the center tap of a single phase distribution transformer get bonded to the grid neutral? [duplicate]
Here are the two wiring diagram.
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Is this how a single phase transformer is connected to multiple houses? [closed]
Single phase transformer serving 3 houses:
I am not sure if this correct. Can someone confirm?
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Why is there a line in, line out and neutral in on a PCB, but no neutral out? [closed]
I am very new to electronics and electrical design, so please be nice. This is probably a dumb question to people more knowledgeable than me in the subject, but I'm just wanting/trying to learn. I've ...
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Grounding Lug Straight To Chassis
Connecting some thicker gauge cable to my trailer to ground neutral for the 12v DC system. The current 8AWG wire uses a receptacle style lug where the wires are inserted and the that receptacle is ...
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3 phase motor, star wiring, neutral
Consider a normal 3 phase motor with star/delta, focusing on the star wiring here... what would theoretically happen if I placed a neutral wire from the star connection contactor, to the electrical ...
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Measuring Line to ground voltage of an ungrounded, isolated output (secondary) in an single phase 400/24v transformer
So we have this electrical control panel in which we have a 24v dc and a 24v ac circuit both. The 24v ac is coming out of a 400/24v transformer. The transformer primary is being fed from a 3-phase ...
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What is maximum possible current in neutral wire in three phase connector?
What is the maximum possible current in neutral wire in eg. 3x16A three phase connector? Is it possible that current leads or lags more than 90 degrees?
Edit:
Could the maximum be
16A∠0° + 16A∠(120°-...
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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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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 involves a huge LED wall.
I have 1000 screens that can pull .6 A each. They are balanced for load on a 400 A 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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