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7 votes
3 answers
813 views

Why do electric arcs rise?

I am a junior electrical engineering student, recently we were learning about the circuit breakers and professor showed us a video of an electrical arc which can be seen in the picture (Sorry for the ...
kaan's user avatar
  • 139
1 vote
0 answers
23 views

Smoothing arc shape in Altium

I was not able to find this topic on any official Altium documentation so maybe any of you could help me out. I have imported from other CAD tool bunch of outline shapes for NLP lines and I want to ...
ABC's user avatar
  • 61
0 votes
0 answers
80 views

Snubber design for a relay that controls a 30W AC fan

I am trying to switch a 30W, 230V AC fan and a LED strip with an Arduino from D11 and D12 pins. In my previous experience, the EMI generated while turning off the fan bricked my project within months ...
CaveScientist's user avatar
0 votes
0 answers
28 views

Raspberry Pi DAQHAT: Overvoltage issue

I am working on development for a piece of HV test equipment, where I need to monitor the voltage output for a circuit that is actively arcing. I am measuring the voltage off of a Raspberry Pi DAQHAT (...
C-LEC's user avatar
  • 1
2 votes
0 answers
217 views

Can I put ferrite cores around the romex in my electrical boxes and breaker panel? [closed]

I've recently replaced most of the breakers in my house with dual-function arc fault/ground fault protection. (I spent five years in forensics, I'm deeply paranoid, don't judge me.) Naturally I'm ...
Stephen Collings's user avatar
1 vote
0 answers
60 views

Arc Lighter: Relationship between transformer inductance, oscillating frequency and energy of the spark

I'm building an arc lighter using YouTube videos as a reference. This circuit from GreatScott worked for me. I'm now trying to understand the relationship between the transformer inductance and ...
selvin's user avatar
  • 11
1 vote
1 answer
84 views

Will arcing occur if the two sources are isolated?

If I have two tracks on a PCB, that are 0.6mm apart, will the 230V arc across to the 3.3V PCB track? The two supplies are isolated. simulate this circuit – Schematic created using CircuitLab
JoeyB's user avatar
  • 2,369
2 votes
2 answers
72 views

Can these timer switches (relays) handle DC or will they arc?

I'm looking to add timer functionality to a 12V agricultural project. It's to turn a light and heat mat on and off at the appropriate times. I was kicking around eBay and found a few timer switch ...
totalconfusion's user avatar
0 votes
0 answers
47 views

Arc jumping from high resistance to low resistance path

Trying to make sense of how to cut current on a high-voltage system without turning everything into plasma. Specifically, I'm wondering whether you could reduce the current by going gradually (but ...
VoltsAndNuts's user avatar
0 votes
1 answer
62 views

Ignition coil circuit creates several hundred volts on metal case

I designed and built this simple ignition coil arc generator a while ago but I've never fully understood one of its properties. It's just a 555 driving a MOSFET with some resonant capacitors across ...
Swiss Gnome's user avatar
4 votes
0 answers
110 views

What is the current industry practice regarding the impact of current-limiting fuses on arc flash calculations?

Suppose you have a panel. The arc flash incident energy for this panel is computed based largely on the available short-circuit current (SCCA) to the panel, and the protective devices upstream of the ...
Stephen Collings's user avatar
1 vote
2 answers
162 views

In a ZVS circuit, why does frequency increase when an arc forms?

In a GreatScott video, when he made an arc using a ZVS circuit, the frequency jumped from 40 kHz to around 80 kHz when the arc formed. I read that this is because the inductance is reduced because of ...
asker's user avatar
  • 35
0 votes
1 answer
191 views

High Voltage Fusion Reactor Design - Electrical safety/risk of arc flash?

I came across the following design of a nuclear fusion reactor (electrostatic configuration): It works as follows: A vacuum is created in the spherical stainless steel chamber. A small amount of ...
J. Grohmann's user avatar
1 vote
2 answers
167 views

High voltage multiplier attempt - low voltage output

I have built a 15 stage voltage multiplier in hopes of multiplying an input voltage of 2kV to ~70kV. This voltage multiplier has been constructed with 3kV 1nF ceramic capacitors and diodes rated at ...
import_hill's user avatar
26 votes
8 answers
4k views

Stopping electric arcs between layers in PCB - big PCB burn

Firstly, let me preface this with the fact that I am not interested in chastising the user, and I am not interested in looking at the original source of the arc (it was a tool accidentally breaching ...
David Molony's user avatar
  • 1,189
1 vote
0 answers
184 views

Why don't 3-phase AFDDs exist?

Seems that commercial arc fault detection devices exist mainly in a 1P+N configuration. What about 3P+N? Are arc faults relevant when powering 3-phase equipment, and what can be done to mitigate them?
Dmitri Nesteruk's user avatar
1 vote
2 answers
152 views

RC snubber not working when R > 0

I am running a 40 Ohm heating element directly connected to a 180 Volt, 8 A (@ max power) PV array. I am trying to use an RC snubber to protect the switch. I calculated the R and C values using this ...
saucerful's user avatar
3 votes
1 answer
268 views

Discharging resistors on capacitor batteries

Yesterday I saw an industrial capacitor datasheet which stated that discharging the capacitors with resistors improves the life cycle of the capacitors, since it prevents electrical impulse discharges....
João Marques's user avatar
2 votes
1 answer
662 views

How can fumes make this electrical arc travel so far in distance to the other side?

Why is the arc travelling so far, and what kind of vapor conducts electrons so well? https://www.youtube.com/watch?v=PXiOQCRiSp0
bandybabboon's user avatar
1 vote
0 answers
51 views

How do nickel alloys from power station switches work?

I have been told that switches made for 1000+ volts and amps use special nickel alloys that have higher resistance to wear and oxidation than pure nickel. Where can I find the names and specifications ...
bandybabboon's user avatar
0 votes
2 answers
855 views

Why ZVS driver (mazzilli) is necessary/preferred?

I need to make a continuous high voltage arc for some project (Birkeland Eyde process). Most generators use ZVS with mazzilli driver, some use voltage multiplier stages and transformers etc. Since I ...
Elementronics's user avatar
-1 votes
1 answer
86 views

Please explain the interaction I observed between a GFCI receptacle and a 3000 volt arc

The high voltage leads of a 120 to 3000 volt transformer, current limited to 30 mA, were each wrapped around a small nail. The nails were allowed to rest upon a piece of wood soaked in an electrolyte. ...
solenoids are cool's user avatar
2 votes
1 answer
182 views

What can cause a surge in one 110 V line feeding a 240 V appliance, melting the connector?

One of the Hot wire (#10/3) going to my oven appear to have experienced a sudden very high in rise temperature inside the junction box, melted the connector, creating a contact with the face plate ...
Denys Picard's user avatar
0 votes
1 answer
653 views

Current transformer with no load?

The apartment complex I’m in is only a year old, so we’re still in the Defect period with the builders. I’m on the Committee of the Owners Corporation, so I get to see the utility areas. The builders ...
John Burger's user avatar
  • 1,493
2 votes
2 answers
289 views

Arc welding: Why is electric arc preferred over fire for welding?

Is it because arc has a higher temperature and more controllable? Temperature of arc used for welding: 9000°F (5000°C) Fire: 400°F- 9000°F (200°C to 4980 °C) It is difficult to believe a spark ...
Dynamic_equilibrium's user avatar
-1 votes
1 answer
292 views

Using 210 V DC to a 220 V AC heater: is it going to work?

I'm considering building an off-grid solar system piece by piece. I can afford a couple of solar panels, after that an inverter, and finally batteries. I was thinking about finding a practical ...
dibg's user avatar
  • 1
1 vote
1 answer
235 views

Arc suppression on electromagnet circuit

I have an application where an aluminum arm is contacting a steel spring and there is a lot of arcing. The contact energizes a 12v electromagnet with a 47ohm coil drawing 250mA and a 4700uF cap to ...
GLF555's user avatar
  • 23
0 votes
2 answers
3k views

Current draw of an Arc Lighter

I have an arc lighter, similar to that which you can see here: My question is this. I understand that you need a very high voltage, created by a transformer within the device, to create sufficient ...
Nick Cory's user avatar
0 votes
2 answers
335 views

Can an arc happen if only one contact on multiple parallel batteries disconnects?

If there are multiple high voltage batteries in parallel, and one of the contacts is unreliable and disconnects sometimes, does the other contact take away the arcing potential, since it's always on? ...
bandybabboon's user avatar
8 votes
3 answers
863 views

The mosquito zapper from hell: why does it arc at different places instead of at the shortest gap?

A few years ago, I modified a mosquito zapper for fun, removing the original transformer and making the zapper more 'interesting'. I just found it again and I had an old question I wanted answered: ...
Thomas's user avatar
  • 1,059
1 vote
1 answer
234 views

Does the thermostat cause arcing?

I am planning use to resettable thermostat switch in my circuit. I will use it to turn off the optocoupler input. With 5 volt, current is 5-10 mA in optocoupler LED. But I'm worried that an electric ...
johny adv's user avatar
1 vote
0 answers
267 views

How to connect 2 traces with an arc in Altium?

Assuming I have 2 traces that are at an angle (Not 45 or 90, but some random number) I want to create a bend that connects them. Using interactive routing I can get this: However, it consists of an ...
Willy Wonka's user avatar
7 votes
5 answers
3k views

Why are arcs so hazardous compared to standard current flow?

I know that electric arcs are dangerous as they can start fires, cause explosions, melted insulation, etc. and they are generally undesirable. However, I am a bit confused as to why. Arcs generate ...
Agniva Chaudhuri's user avatar
10 votes
4 answers
4k views

Why might a low-cost soldering iron die after short use?

It's been a while since I have soldered, so I bought a cheap unbranded soldering iron to use while I re-familiarised myself with the skill. After a few weeks of use, I turned it on just now and it ...
Nick Bolton's user avatar
  • 2,103
1 vote
1 answer
118 views

What are the effects of small spark gaps on connectors?

I was reading about the '4th Pin' problem that effects almost all modern iPhone users. It is where the 4th pin on the lightning connector turn black and eventually will not work until it is scraped or ...
Liam Kelly's user avatar
1 vote
1 answer
130 views

Will an electric arc occur if there is a large enough resistor between voltage source terminals?

I want to create a multi select voltage divider from high voltage (1-2kV), but the switch (50V rated) is not rated for high voltage. Should I worry about an arc being created if I have a 10MOhm ...
user43647's user avatar
0 votes
0 answers
87 views

Is a high open circuit voltage still beneficial when you have a high voltage/frequency pulse arc starter?

In welding, I know a high open circuit voltage is a major factor in the strength/quality of your arc when you scratch start, but how much of a factor is it when you have a pulse starting mechanism? Is ...
Chris Brown's user avatar
2 votes
0 answers
223 views

Can arcing in IEC 60320 C13/C14 connectors damage a device?

I have a 'guitar effects power supply' built to supply 9v/12v/18v power to 🎸 guitar effects pedals. It is powered using a IEC 60320 C13/C14 power receptacle and cable. After using this device for the ...
Xunie's user avatar
  • 185
1 vote
0 answers
429 views

What is the most effective way to prevent electrical arcs across resistors?

When building any kind of ultra high voltage boost circuit or transformer, the high voltage will often arc between components if the voltage is high enough and the distance between them is short ...
Delaney Fitzpatrick's user avatar
0 votes
1 answer
160 views

Stop a Relay H-Bridge for Brushed DC-Motors to get burned

i am using two Relays to create an H-Bridge. This H-Bridge drives a 24V Motor ~3A in both directions. Now i often got the problem, when i turn on a motor and turn it off again, the relay contacts are ...
r3tr0_'s user avatar
  • 1
2 votes
2 answers
5k views

Determining voltage by arc length

Ludic science light dimmer driver I was watching this video made by ludic science and at 3:14 he said that at the maximum output of the high voltage ignition coil, the distance was 10mm/1cm which he ...
import_hill's user avatar
1 vote
0 answers
750 views

Diy arc lighter

I am trying to make an arc lighter, tried rewinding primary of ccfl transformer/inductor with only few turns and made my own with inductor I got from cfl circuit, they all worked fine for some time ...
asim's user avatar
  • 600
1 vote
1 answer
554 views

Reversed universal universal motor sparks and shows arcing even though brushes are completely perpendicular to the commutator

I need to reverse the rotation of the universal motor in question so I swapped the wires leading to the brushes and that successfully reversed the rotation, but now the commutator is arcing and is ...
Juani Elias's user avatar
0 votes
2 answers
577 views

Electromagnetic radiation from spark gap

I am an electrical college student. I learned from some papers, sites online, including this forum that lightning discharge or any electrical arc emits wideband radio frequency because the odd integer ...
Ramanda Nvl's user avatar
0 votes
1 answer
88 views

How do I make a “directed” spark gap?

(Originally asked on engineering StackExchange, I was directed to ask it here) For a project, I need to create a spark gap that only triggers when there is a conducting material between the 2 contacts....
Mat NX's user avatar
  • 199
2 votes
0 answers
48 views

Will these gloves comply with electrical arc flash safety?

I am beseeching any OSHA, CalOSHA or electrical safety experts out there on this one for a little help. I know this is not strictly electrical engineering but this is the closest Stack to the topic. ...
ElectricianPat's user avatar
0 votes
0 answers
103 views

Induction heater mosfet arc

I am building an induction heater and connected everything up. Once I connected the circuit the first time I tripped the breaker. The main breaker was only a 20Amp coming from the wall. I realized I ...
user3634976's user avatar
1 vote
4 answers
2k views

Why faulty, old CRT TV produce ozone

I have an old CRT TV which had to be switched ON for half an hour or so for the picture to stop being blurry and be 'viewable'. During this initial warm-up time there was a 'static' like noise coming ...
schizoid_man's user avatar
1 vote
1 answer
158 views

Which is worse for a relay? High inrush current or large voltage difference between the relay contact and the signal being switched

simulate this circuit – Schematic created using CircuitLab I am working with a high voltage relay (Cynergy3, DBT72410) to discharge a 70 uF capacitor charged to 4 kV using a string of resistors ...
David Santos's user avatar
0 votes
0 answers
635 views

How bad is this commutator pitting?

I'll try to post an image but I think there is some pitting on one of the bars of the commutator and was wondering how bad it was and if it can be fixed.You can see the right side brush looks pretty ...
mac_33's user avatar
  • 125