Questions tagged [bad-wiring]

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

Filter by
Sorted by
Tagged with
-2
votes
2answers
73 views

Why would test screwdriver light be dimmed? [closed]

So the wiring in my flat is catastriphic. Some things are grounded and some are connected to neutral. Bunch of switches that don't do anything. Open wires because there was probably a switch there ...
-2
votes
2answers
109 views

Before build: Will this circuit work, or have I overlooked something?

Some friends and I have given ourselves the goal of building a unidirectional speaker. We bought the necessary components and electronic parts. Before starting to connect everything we wanted an ...
0
votes
1answer
75 views

A/C voltage in the air? [closed]

I've been building a counter top dishwasher and just noticed that my sink is kind of grounded, around 30Megaohms resistance but 120V. While checking that I also noticed the air near metal in my ...
0
votes
1answer
107 views

Bad Residential Wiring - Dead circuits and circuits go on and off randomly [closed]

We moved into a home that is about 30 years old ten years ago. Our hallway lights are on a a circuit that is usually dead, but occasionally comes on for a few minutes or so, sometimes a few hours. ...
0
votes
1answer
213 views

USB reverse polarity protection - MOSFET

I am thinking about a relatively cheap and simple protection against USB reverse connection/reverse polarity. At the moment I am thinking about P-channel MOSFET, with the drain directed towards the ...
0
votes
0answers
43 views

Effects of bootlace ferrules to connect load-cell with amplifier

My colleague and I had an argument about whether or not to use bootlace ferrules for a load-cell (4 stranded wires + 1 shield | 100mg precision | OIML C3 | max. 3kg) going into an amplifier (spring-...
0
votes
1answer
64 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 ...
1
vote
3answers
81 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 ...
1
vote
2answers
391 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 ...
4
votes
2answers
363 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 ...
0
votes
1answer
363 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 ...
0
votes
0answers
44 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 ...
0
votes
1answer
44 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 ...
1
vote
3answers
1k 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: ...
1
vote
1answer
112 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
votes
1answer
79 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 ...
0
votes
1answer
548 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 ...
0
votes
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, ...
-1
votes
1answer
11k 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?
2
votes
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 ...
15
votes
3answers
24k 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
votes
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. ...
0
votes
1answer
859 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
votes
1answer
677 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). ...
1
vote
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 ...
3
votes
6answers
11k 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
votes
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 ...
-1
votes
1answer
416 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 ...
5
votes
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 ...
2
votes
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, ...