Questions tagged [safety]

*Your* health and safety while working on electrical devices, and designing devices that will not shock, set fire to, or otherwise harm the user of the device.

Filter by
Sorted by
Tagged with
0
votes
3answers
117 views

How to connect 5 kW electric heater to the weak wiring in house?

The water heater has a 5kW heater and requires 20A. Unfortunately, the wiring in our house is old and this allows us to get only 10A. Is there an easy way to reduce energy/current consumption and ...
1
vote
0answers
45 views

Heel strap vs wrist strap around ankle

I am a novice to electronics, and I am currently building a home workstation. In this question on ESD chairs, the user Sparky256 said the following in his answer: If you are wearing BOTH a wrist and ...
0
votes
0answers
10 views

Circuit breaker problem [migrated]

I want to test if my oven can trip the GFCI. The leakage current should not be a problem but I worry about the GFCI would trip at high frequency. So I bought three circuit breaker and tested oven on ...
1
vote
2answers
255 views

ESD chair for home workstation [closed]

As mentioned here, I am a novice to electronics, and I am currently building a wooden workbench. The workbench will have an ESD bench mount and ESD matting over the entire bench. Furthermore, the ...
1
vote
2answers
65 views

How does equipment ground protects us from electrical shock?

What I have always learned is current leave the source and return back to the source, forming a closed circuit, here are the two thought experiments I had and got confused: Scenario 1: Here I have a ...
0
votes
2answers
77 views

ESD safety when working across multiple workbenches/tables

I am a novice to electronics, and I am currently building a wooden workbench. The workbench will have an ESD bench mount and ESD matting over the entire bench. I now want to have a small fold-out ...
0
votes
0answers
40 views

Connecting a capacitor between DC motor terminals

I have read this article from pololu which suggests adding a capacitor between motor terminals. I have done just that but I'm worried that I might blow something up due to two reasons. I'm somewhat ...
3
votes
1answer
98 views

Is there a safe way to operate any type of a tesla coil on a functioning modern car (moving road vehicle)?

(Updated with clarifications) Could a tesla coil be safely built, installed and operated on an active road vehicle which is driving a regular city street? Let's say we want the discharges to be 20-...
1
vote
0answers
40 views

How safe are Isolation Amplifiers compared to Voltage Transformer

I was searching for a miniature transformer for my 240V AC voltage measurement circuit and a kind individual recommended me a pecular IC. The IC is a Differential Isolated Amplifier AMC1100. And it ...
0
votes
1answer
41 views

How much clearance do I need between floating ground and earth referenced ground?

I have two circuits where one side is earth reference and another floating. The floating circuit is isolated by a transformer and talk to the earth reference circuit via opto-coupler. During final ...
0
votes
1answer
49 views

Maximum amps over 24 AWG CAT5 wires [duplicate]

I have a project that runs on 5V and should draw a maximum of around 500 mA. There is an existing CAT5 cable running conveniently to this project. I'm considering powering the project by using two of ...
0
votes
1answer
48 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 ...
0
votes
1answer
73 views

Checking if a device is safe to use

For someone with no knowledge in electrical engineering, is there a way to check if a device is "grounded" (?) and safe to use? It is not uncommon when shopping for appliances online (eg. lamps), ...
2
votes
4answers
222 views

Undervoltage protection strategy for Li-ion batteries

We are using a Li-ion battery with built-in safety PCM (Enix MGL9070), a gas gauge to monitor the battery voltage (STC3115A from ST) and a battery charger (bq24133 from TI). To protect the battery, ...
0
votes
1answer
45 views

Electric shock from cover of preamplifier

I'm using a Focusrite Scarlett as a preamplifier between my computer and amplifier. The preamp gets power only through a USB connection. Sometimes when I touch the cover of the preamp, I can hear a ...
1
vote
2answers
58 views

Feedback regarding isolation practices on a 5V/Mains PCB

I am currently designing a PCB for a project including PID-control of a heater. The heater runs on mains (220V) and is controlled using zero-crossing switching to regulate the power and minimize EMI ...
0
votes
1answer
48 views

Temperature of Power Driver ICs

I'm using TI DRV595 power driver in an application requiring several amperes of current. My observation using thermal camera has been that at 3.5 A the driver IC core reaches temperatures around 90 ...
0
votes
2answers
64 views

Overvoltage + Overcurrent protection

Our compliance agency believes that it is all too likely that a 50 V power adapter is used instead of our 5 V power adapter. Regulation wants a fuse which can protect from 50+ V, and not allow 15 W ...
1
vote
3answers
101 views

How much 12V DC current can I safely draw from an AC 230V 13A socket and why?

In my cabin I have a sollar cell and a 12V battery that I use to power my electronics. However I'm dissatisfied with the standard CL sockets used in cars (apparently I'm not the only one) and I ...
0
votes
0answers
22 views

Lithium Ion Battery - Testing & Self Discharge

It is suggested and commonly understood that if Li-ion batteries drop below a certain threshold that we consider the cell(s) unstable and untrustworthy with a loss in cell capacity and that increased ...
0
votes
3answers
100 views

What's the difference between these plugs?

I'm not an electrical engineer, but I play one on TV. Can you help me be more realistic? Our facility has three items that run on three phase 208 and plug in at a temporary building using CS (...
2
votes
1answer
48 views

UL certification and laser tag equipment

We are a 32+-year-old laser tag equipment company. We purchase parts overseas and assemble them in the US and have hundreds of installations all over the world. We have been told by 1 location that ...
1
vote
1answer
36 views

Deep cycle battery charging ventilation [closed]

I have a small boat and the main deep cycle battery is located just under a "shelf" like thing near the transom that acts as a cover for the gas tank and battery. On one side, it is completely open (...
1
vote
0answers
61 views

How can I protect my amplifier, MCU, and laptop from damage in my application circuit?

I am trying to integrate a few devices for a laser stabilization system. I have a tentative circuit diagram that I'm asking for more expert guidance in implementing. I am using an MX200 from ...
1
vote
0answers
19 views

How do I select the subclasses of X and Y safety capacitors? [duplicate]

While designing a switch-mode power supply, I've been reading a lot about X and Y rated safety capacitor. Although I fully understand their use and limitations, how do I determine if I need a X1 or X2 ...
1
vote
1answer
29 views

Running digital ground at AC line potential (not neutral)

I've run across an interesting WiFi dimmer module known as a Shelly dimmer. This bright green module is designed to be used inside an electrical box. Most of it's user interface is over line-...
1
vote
1answer
85 views

Repairing burned PCB traces for 220V. Is it safe if I don't know why they burned?

I'm trying to fix the cooker hood of my kitchen and I found that the problem is in the controller. The PCB has two burned traces, respectively to the electric source of 220V (neutral and phase... ...
1
vote
0answers
36 views

Heatsink Crossing Primary and Secondary Sides in Switched-Mode Power Supply

I've taken apart a non-oem laptop power supply. There is clearance on the board between primary and secondary. However, they've placed a single heatsink across the board for the primary and secondary ...
0
votes
4answers
178 views

Adding to the output of a DC/DC Boost Converter using the same power supply as the input?

I've got a project that requires a variable output between 24-48V. This needs to be continuous-current, not PWM. Items that I have handy from my 'box of bits', and ready to work with are: an 0.6-36V ...
1
vote
2answers
57 views

Can galvanic isolation be performed at the user interface (UI)?

With capacitive touch sensing and transparent materials, it seems like it would be possible to run small digital devices from A/C mains without a transformer isolated supply. Is there a flaw in ...
3
votes
2answers
220 views

In 2020, what are the most common approaches to power-line-communications for hobbyists? (updated)

I'm looking for modern control protocols, designs and/or components to simplify controlling (and running) a very low power system on a chip safely from mains power. I'm in the USA, and on a hobby ...
0
votes
2answers
46 views

Should I be worried about a surge protector near my pillow

I have just realized how close my surge protector appears to be to my pillow. It is about 20-30cm away. Should I be worried about any EMF/radiation/something else? The surge protector itself is new ...
2
votes
2answers
67 views

A safety relay systems circuit

Can someone help explain the operation of a safety relay system. I know that they can be connected to e-stops for emergency stops but I don't understand the relays and how they operate.
0
votes
0answers
49 views

Concentrated Ozone Treatments for COVID-19 Sterilization: What levels and duration are safe for consumer electronics?

Operating a critical IT service for necessary businesses brings some risks at this time that need to be mitigated. I have some powerful ozone equipment used to sanitize / sterilize rental property and ...
6
votes
3answers
177 views

What happens to parts of induction cooker magnetic field not covered with the pan?

An induction cooker works like this. There's a flat coil of wire under the cooker surface which is connected to a source of high frequency AC and it produces an oscillating magnetic field with field ...
0
votes
1answer
59 views

How safe is to work on an ATX PSU as a bench power supply?

I'm trying to convert an old ATX PSU into a workbench supply. I saw there are many safety warnings about discharging the internal capacitors before opening the PSU. I'm not really concerned with it as ...
2
votes
1answer
76 views

Is it OK to have a connection between 0 and PE on a DC device?

I have a device meant to be used inside electrical cabinets. It has a metal casing and is powered by 24V DC. It has three power connectors: 24V, 0V and PE. I was surprised to find out that 0V and PE ...
1
vote
2answers
113 views

Beginner questions, 230v switch on PCB

I've designed some PCB's in the past but never really had to worry about load and safety. Now I need to build a small PCB with some 230v AC cirquits. The load will be minimal, but still I have healthy ...
5
votes
1answer
135 views

How to safely ground a device plugged into an isolation transformer

I am working on an old turntable power supply on my workbench. I have acquired a 1:1 bench isolation transformer to increase safety while doing this. It seems to be a well known "issue" with at least ...
0
votes
3answers
52 views

What are the specific scenarios that an isolation transformer is useful for avoiding?

I have a home workbench and do minor refurb work with old turntables and monitors (CRT) etc. That implies potential exposure to high voltages (mains or above) at power supply capacitors, etc. I have ...
0
votes
1answer
57 views

What is the danger of going beyond the current limits of a wire carrying AC current

If I am using 18 AWG wires with a current limit of 16 A, what are the potential hazards of going beyond 120V,AC and 16A,AC(rms)?
0
votes
1answer
138 views

Is 26 AWG good enough for a ~1.5 amps current at 5V?

I have recently started to learn about electronics and as my first project, I'm trying to make a wifi-enabled LED strip. I have read a lot about all the theory, followed tutorials, and try to be ...
0
votes
2answers
76 views

Safety switch to latch when power turns off till reset

So I currently have a drive run by a PSU. I have a thermal controller that will cut power to the drive when it runs over temperature but it doesn't latch off, so as soon as the drive cools a little it ...
1
vote
1answer
54 views

SMPS Testing: Differential Probes or Common lead and best Grounding practice

I'm testing a Switch Mode Power Supply that is not outputting the required voltage. It's only two prong, hot and neutral, and I wanted to get clarification on the best way to approach measuring the ...
0
votes
1answer
44 views

Splitting/y'ing a thermocouple amongst 2+ inputs

The system in question has just one type K thermocouple. Is it a bad practice to Y a thermocouple into 2+ thermocouple inputs? For example, Y a thermocouple into: DAC thermocouple input card Limit ...
0
votes
0answers
59 views

Relay contact side protection

Do we need any protection on the contact side of the relay (Ex: form C 240V 3A) if the contact side is not powered by the circuit. if we have to protect, then how(Please provide an example). Also, ...
0
votes
1answer
48 views

Sniffing lowspeed CAN bus with highspeed device

Is it possible to use a highspeed (HS) CAN interface for listening to a lowspeed (LS) CAN bus? If so - Is it in any way questionable to do so in a real world car or moped? As far as I know, LS CAN ...
0
votes
1answer
68 views

audio signal passing through my body

Something really weird happened while working out soundcard issues on my rockmite tonight. While holding two unconnected ends of a 3.5mm cable in each of my hands, the audio signal passed through my ...
-1
votes
1answer
50 views

Separate grounds but connected supply voltage between circuits

I have a question: For a project I want to separate two circuits for safety reasons. One circuit is a battery powered (+9V) amplifier/level shifter for an electrode touched by the user. The second ...
0
votes
0answers
32 views

how to proteus simulation inrush current

i've a reverse polarity protection , i want to check inrush current simulation , but i don't know how . i read this , but i tried but doesnt work How to plot voltage vs current graph on Proteus ...

1
2 3 4 5
16