Questions tagged [bad-wiring]

A tag for questions about, or involving systems that are not using proper connections, components, or potentially dangerous circuitry.

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1answer
55 views

Connecting a blind cable to electrical system [closed]

I am trying to connect a blind cable, (cable that doesn't have any end point connected to the grid), to the grid. This is how electrical wiring looks like. X's are lamps. and black lines in the first ...
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3answers
71 views

How do I test grounding/lightning protection?

I manage IT for several clients in Central Florida, where we have quite a lot of lightning (the most in the U.S.). I have one client that has trouble keeping electronic devices alive. We have replaced ...
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2answers
78 views

Led ON on Spike Guard Even When Switch is OFF [closed]

I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the ...
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2answers
274 views

Is it possible that an outlet can kill AC motors?

I have two recently dead tower fans. The first, I've had for over 6 months, no problems. Recently, I moved it to a new room an plugged it into a different outlet. It died within a day: it seems to be ...
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1answer
78 views

Generator to Main changeover issue RCCB not moving up

RCCB not moving to up position while DG to EB ( generator to mains) changeover. I live in a community where we have almost 1200 apartments in India which will serve power through generators when the ...
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0answers
40 views

wiring for my timer switch

I'm trying to wire as per the following wiring diagram. I completed wiring as below, and timer is switching on, but at the programmed time, light is not switching on, anything wrong with wiring. See ...
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1answer
37 views

Wiring confusion in joining two cables with 5.5 x 2.1 mm DC male ends, please explain

I've got a 12V powerbank that I would like to use with a 12v device. The power bank output and the device both require 5.5 x 2.1mm male plugs. I've actually got some random cables and have found two ...
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3answers
280 views

Is it safe for a screw at the terminal block to have multiple wires with fork connector end connected to it?

I have a DC-DC converter (24v to 12v) that has terminal block at its input and output terminal. To understand it better, I've attached the drawing of the converter found in its datasheet. Problem: ...
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1answer
59 views

Ground wire appears live despite not being connected on either end

I have decided to add another plug outlet near an existing blind outlet box. Unfortunately I've found that the existing one doesn't have ground since it's an old building, but that's a problem for ...
0
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1answer
60 views

Custom USB Y cable [duplicate]

I am creating a custom dual female USB Y cable for a hardware modification project in a USB mouse. I have the wiring set up as shown, is it correct? RED, WHITE, BLACK, GREEN, THICK BLACK from female ...
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1answer
465 views

How can I use two output wires as one?

Sorry about the novice question. At the moment I am using an op-amp (http://www.ti.com/lit/ds/symlink/lm224-n.pdf) to boost my analog load gauge sensor output. The op-amp takes two inputs and gives ...
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1answer
1k views

Wiring on-off switch with resistor to SoC

Please note: although this question involves a Raspberry Pi (hereafter RPi), it is really a pure electronics question at heart! I am trying to connect my RPi 1 Model A to a breadboard with a single, ...
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1answer
10k views

What happens if a positive and negative wire touches while connected to a speaker? [closed]

Would it just give feedback? Or have negative effects on the speaker itself?
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2answers
3k views

Soldering thin leads of a thermocouple

I have a thermocouple with me which is custom made and its leads are very thin. It has a diameter of 0.19 mm and this has to be soldered to a chip (Max6675). This setup will be placed on a harsh ...
12
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3answers
17k views

How far can mains voltage arc in air?

I wondered this while soldering a mains voltage circuit board and was surprised by how close together the traces were. It has obvious implications in design of electrical plugs, and the proximity of ...
2
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1answer
1k views

Un-insulated Ground wire in USB cable

I am attempting to put a switch between the Data + and the ground wires in a USB cable. Now that I have cut open the USB cable, it does not seem to match any of the pinout diagrams I can find online. ...
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1answer
729 views

Motor wiring problem

I have a bit of a problem correctly wiring up the motor on a piece of industrial equipment that was ordered from China. When ordering I was told that it would run off of a three phase supply. I've ...
2
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1answer
591 views

Grounding conductor has a non-zero voltage (i.e. with respect to “true” ground). Why?

We're building a new house and I'm not confident with the skills of the electrician who installed the receptacles. In our country, residential structures are supplied with 240 V, 60 Hz (single phase). ...
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1answer
8k views

measuring resistance in a wire with a short

A couple of questions: I have a camper trailer that apparently has a dead short in either the positive or ground wires between the battery and the fuse panel. Someone told me to measure the ...
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5answers
9k views

Why is it not advisable to fuse the neutral

I have been doing some research on this question. The answer I get most of the time is that this is for safety reasons. That there can be no current in the neutral that didn't come from the live. If ...
27
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6answers
8k views

How do I describe this circuit?

simulate this circuit – Schematic created using CircuitLab Yes, this circuit diagram is correct. No, I did not design it. How do I describe this circuit in words? I thought about "a switch and ...
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1answer
386 views

How to wire ADC (AD7738)

I'm trying to make sure I have it wired up properly, because I am seeing very odd outputs from my DOUT (MISO) pin and I think it may be connected to my wiring. On a rare occasion I get a good set of ...
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2answers
1k views

Salvage data from a reverse connected thermocouple?

My SAE Baja team had a competition this past weekend, and we were using some thermocouples in order to get some temperature data on the drivetrain and engine. They were hooked up right before the ...
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3answers
2k views

Does an inexpensive screw terminal “expansion strip” exist?

I've got a messy security panel that needs cleaning up badly, as I need to connect another PCB for remote access and can't get the wires to reliably stay in place: If you look at the black, red, ...