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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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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 ...
A R's user avatar
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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 ...
Nhit C's user avatar
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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.
Nhit C's user avatar
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2 answers
110 views

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?
Nhit C's user avatar
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1 vote
3 answers
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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 ...
Yourtakingmylife's user avatar
1 vote
1 answer
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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 ...
jhickok's user avatar
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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 ...
llVIU's user avatar
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1 vote
1 answer
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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 ...
Aamir Awan's user avatar
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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°-...
JPX's user avatar
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4 answers
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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 ...
Gog's user avatar
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2 answers
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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. ...
Gog's user avatar
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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?
Natnael Goitom's user avatar
2 votes
1 answer
253 views

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 ...
Srijit B's user avatar
1 vote
1 answer
267 views

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/...
Tempus Nomen's user avatar
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2 answers
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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 ...
Ri Di's user avatar
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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. ...
Thomas's user avatar
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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. ...
blueturkey's user avatar
1 vote
2 answers
96 views

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 ...
Outis Nemo's user avatar
1 vote
0 answers
63 views

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 ...
Paul's user avatar
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2 votes
4 answers
1k views

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 ...
Jishnu Prakash Nambiar K K's user avatar
-2 votes
1 answer
98 views

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?
El Jefe's user avatar
2 votes
4 answers
2k views

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 ...
Philip's user avatar
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3 votes
2 answers
2k views

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 ...
user1273784's user avatar
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1 answer
449 views

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 ...
ScottishTapWater's user avatar
11 votes
4 answers
987 views

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 ...
bernz's user avatar
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4 votes
2 answers
902 views

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 ...
SimplyTech's user avatar
2 votes
1 answer
5k views

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 ...
Terry70's user avatar
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2 votes
4 answers
2k views

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 ...
audiFanatic's user avatar
1 vote
1 answer
487 views

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 ...
DarioP's user avatar
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2 answers
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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 ...
user299763's user avatar
10 votes
10 answers
4k views

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 ...
Musa's user avatar
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1 vote
1 answer
61 views

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 ...
spraff's user avatar
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-1 votes
1 answer
114 views

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 ...
James S 's user avatar
1 vote
1 answer
67 views

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 ...
Kemkoooo0's user avatar
3 votes
2 answers
20k views

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 ...
Ady's user avatar
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2 votes
0 answers
87 views

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? ...
ben5en's user avatar
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0 votes
4 answers
95 views

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 ...
chris alyui's user avatar
1 vote
1 answer
2k views

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 ...
miky-1's user avatar
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1 vote
1 answer
1k views

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 ...
ElectricianPat's user avatar
2 votes
0 answers
158 views

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 ...
Hemant Yadav's user avatar
0 votes
1 answer
95 views

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 ...
Lmtc's user avatar
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0 votes
1 answer
222 views

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 ...
user5349's user avatar
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0 votes
3 answers
980 views

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 ...
G M's user avatar
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0 votes
3 answers
162 views

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 ...
Justin Montego's user avatar
0 votes
1 answer
796 views

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 ...
Siva Prasad's user avatar
3 votes
2 answers
2k views

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?
Shashank 's user avatar
0 votes
3 answers
3k views

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 ...
Shashank 's user avatar
0 votes
0 answers
103 views

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 ...
Rick's user avatar
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0 votes
1 answer
249 views

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 ...
Andr's user avatar
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1 vote
1 answer
220 views

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 ...
JoeATL's user avatar
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