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2 votes

What is happening to the flow of electricity in a magneto when you shut off power in a lawn mower or plane?

The accepted answer is correct from an electrical engineering point of view, but may be confusing from an aviation standpoint which seems to focus on the P-Lead. I am an ATPL instructor for this ...
Andy Woolford's user avatar
0 votes

Can I connect the inverter's ground wire to the vehicle chassis and the vehicle chassis to Earth?

Yes, it's ok for your appliances to connect to chassis GND. It's also ok to connect your chassis GND to shore power GND when you hook up. Note that the inverter already connects (-) (battery/chassis ...
hacktastical's user avatar
  • 52.8k
0 votes

How to ground DC 12V battery, charge controller and solar panel?

Local electric codes may mandate protective earthing, but it is good practice anyway. Yes, earthing is needed for lightning protection. You’ll need to drive a ground rod or two into the earth. Do not ...
Kuba hasn't forgotten Monica's user avatar
0 votes

Protection from live casing without true ground

Wouldn't it be safer to detect such a fault before current is actually going though someone's body? Such a circuit could be cheaper, thus more accessible, especially where grounding commonly lacks. ...
Andy aka's user avatar
  • 453k
0 votes

Earth and neutral voltage detection

I would like to trip a relay coil using a microcontroller if the earth to neutral voltage exceeds 3 V Use a 3V-rated-coil relay. Such relays trip at a bit lower voltage, but the coil is for DC ...
Kuba hasn't forgotten Monica's user avatar
0 votes

Earth and neutral voltage detection

Neutral and earth are most often (but not always) bonded at the panel. The neutral vs. earth shift seen at a plug is caused by IR drop in the wiring, and will vary with load. The limits on drop are ...
hacktastical's user avatar
  • 52.8k
1 vote

Phase neutral earth fault indicator circuit

Is this an acceptable practice in general? If you mean is the circuit suitable then the answer us a big fat "no". LEDs have a maximum reverse voltage that is at best tens of volts and not ...
Andy aka's user avatar
  • 453k
0 votes

What is the difference between earth and earth from a power outlet?

The ground wire in home wiring "should" be safe. Of course there can be errors in wiring, lightning strikes, and various other reasons why the ground wire might not be safe. However, if ...
Math Keeps Me Busy's user avatar
5 votes

What is the difference between earth and earth from a power outlet?

Telling people to avoid the PE terminal, when trying to earth stuff to achieve safety, is... dangerous nonsense? As to why not to use the PE terminal in a wall socket, to earth namely a rack cabinet, ...
frr's user avatar
  • 2,788
6 votes

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

Paintless (raw) enclosures seem rare, are they bad practice? Paintless does not imply raw, untreated aluminum. Yes, you can sure buy untreated aluminum enclosures, but they are not a finished product ...
Kuba hasn't forgotten Monica's user avatar
7 votes
Accepted

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

Aluminum is soft; a bare finish is not very durable, prone to scratching, scuffing, etc. A bright metal finish is attractive when new, but a dingy surface quickly gets unappealing, and a printed ...
Tim Williams's user avatar
  • 32.1k
9 votes

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

Aluminum is a somewhat active metal, and all finish options reduce that to varying degrees. Whether unfinished aluminum is a bad idea or not, depends on the environment and application, but a ...
Pete W's user avatar
  • 1,437
5 votes

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

Not a good idea. Bare sheet aluminum has a grain to it, and stuff gets down into the grain - fingerprints, oil and grease, etc. Bad for cosmetics. The real reason is electrical. Bare aluminum ...
AnalogKid's user avatar
  • 19.6k
4 votes

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

A paintjob (or powder coating, anodization, ...) makes EMC more difficult if anything, because cable shields can make much better circumferential chassis contact on a bare metal wall. On the other ...
tobalt's user avatar
  • 21.1k
1 vote

What is the safest and most noise free grounding method floating or non-floating for audio plugs & circuits on 2U aluminum case and SMPS

I solved the problem by getting rid of the switching power supply and went with a simple step-down transformer, full wave bridge and capacitor. Now It is noise free. I ended up floating the audio ...
Jim Dandy BOA's user avatar
0 votes

MAX31865 RTD converter will it acccept only floating inputs?

I know this is an old question but I stumbled in from Google. I have a MAX31865 on a PCB measuring a 2-wire PT1000 RTD. I didn't intend for the RTD to be grounded but the threads on the bulkhead SMA ...
MattD's user avatar
  • 43
0 votes

Where to connect shielded cable when you have no chassis?

The noise current in the cable needs to be returned back to the source. If you are only dealing with 30MHz plus, you may just be able to capacitively couple The shield back to the source voltage rail ...
Voltage Spike's user avatar
  • 81.3k
0 votes

Shielded Ethernet cables in office buildings - ground loops?

For a cable shield to be effective (at high frequencies) and not act as an antenna, it should be grounded at least at both ends. It should be grounded at those high frequencies only. Vendors who just ...
Kuba hasn't forgotten Monica's user avatar
0 votes

How to simulate a finger touch electrically to remove noise

Because the noise is attenuated when you touch the module, it is likely that the problem is noise from your power supply getting into the module. When you touch the module, you effectively grounding ...
Math Keeps Me Busy's user avatar
1 vote

Sharing 115 VAC ground and 28 volt DC ground

Basically the neutral line is tied to the DC Power negative line as well. NO! Do not connect the neutral of your AC mains to ground, except at the breaker box. To do so is a safety hazard, and is ...
Math Keeps Me Busy's user avatar

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