Mains electricity, typically a higher voltage AC waveform used to deliver electrical power to households. In North America 120V, 60Hz, in most European countries 230V, 50Hz. What most people will plug appliances into.

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2answers
73 views

Cable rating - What is the max amp for a 1.5-1.75mm cable?

I have a new hob (magnetic induction plate). It requires 7200W/32A. The power grid's voltage is 230V (Europe). I have already installed a thick cable and I want to use it (it would be difficult to ...
2
votes
3answers
59 views

Sensing state of an electrical appliance

I know nothing about electrical engineering however... Is there a way I can detect when an electrical appliance is on? For example when I turn on my tv, a small blue light turns on so I know, but say ...
2
votes
3answers
219 views

Where are these 50Hz noises from?

Circuit structure: An AC to DC power converter MeanWell 220V to 5V. The output is 5V. The power grid runs at 50Hz. We build DC-DC converters(Power Module) with multiple orders of Low pass filters ...
0
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1answer
60 views

What is “mains outlet tester” (for proper wiring) in the context of US power connector standard?

I'm curious about this comment. It says what ... in the US or UK you should be able to go to a hardware store and buy an outlet tester for very little money. This is a little plastic housing ...
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4answers
102 views

Benchtop circuit breaker

I repair electric appliances and tools. Every once in a while, the main circuit breaker trips when I plug in a device. I don't want to prevent a circuit breaker from doing its job, but I would prefer ...
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0answers
77 views

Issue with MANUAL-AUTO logic [closed]

As per the circuit I would be able to control the circuit through the manual switch which is connected to the Digital Input of the controller where 5V DC is looped and other alternate command ...
0
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3answers
121 views

Should I continue with daisy chaining?

I've been daisy chaining power strips and it was no issue until my friend told me it's dangerous. I was using 2 monitors, fan, desktop,55inch TV, monitor speakers, and a phone charger. And he told me ...
6
votes
8answers
1k views

Can I use a 10A light switch with an appliance with a 13A fuse?

I have a vacuum cleaner, which I wish to add a switch to, so that I can leave it plugged in all the time and use the switch to turn it on and off. The vacuum cleaner has a fuse rated 13 Amps. I ...
0
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0answers
16 views

Muller TC 24.21 Timer Wiring Help [migrated]

A very basic question. I've just bought a digital time switch model TC 24.21 from Muller. According to the back of the timer it takes 230V~50-60Hz, and I'm a bit stuck exactly how and what to connect ...
0
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1answer
58 views

SSR not switching dimmed load

I have a system where there is a "master dimmer" (an 800W dimmer designed for household lighting). From that master dimmer, I have a few SSRs switching 40W incandescent light bulbs. The idea being ...
0
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0answers
58 views

Microcontroller (Arduino) issues detecting mains AC power

I've been trying for a while to find a simple yet accurate way to measure power through a mains cable 240VAC I've seen online methods using hall effect sensors. Could someone please help me to ...
0
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0answers
9 views

Confused by ~115VAC 5-wire cabling to UK thermostat [migrated]

I have a 5-wire cable as used for 3-phase (i.e. stripes/blue/brown/black/grey) coming to a hole where a thermostat was - only the earth, live (brown), and switched live (black) were used by this ...
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2answers
46 views

Calculating AC power figure using the DC current consumption

In a system where I have 220V AC recitified/regulated/converted into 3.3V DC through a transformer and a voltage regulator, would the amount of current I will be drawing from the AC line equal to the ...
0
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2answers
39 views

Hooking up a variable frequency drive

I have a 3-phase blower motor that I am looking to control from a Danfoss VLT 2800 that I purchased on eBay. I am going through the manual and I see this table for the mains connection: . I have in ...
0
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2answers
119 views

Ghost? voltage on lamp outlet when turned off (72V/50V) [closed]

I have a < 10 year old house. And today I wanted to use the 2nd lamp outlet in the living room, and even though it was turned off, I got hit by electricity. I am in 230V, 50Hz country (Measured ...
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2answers
55 views

use of neutral line in power distribution? [closed]

Neutral Line - what is the propose of this line ?. In-case Neutral line failure power will be lose ? In power Distribution We are using Line (phase) for input ~240V, In after usage or cycle, What ...
3
votes
5answers
261 views

Three-way AC switch indicator without adding a wire

I am dealing with some three-way light switches that people are always forgetting to turn off. Any suggestions/schematics for making a simple LED indicator at each switch to indicate if the circuit ...
1
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2answers
75 views

Mains Linear Power Supply Protection

This is a two-part question: Why do the so many projects that I see that use basic linear transformer power supplies (i.e., mains->transformer->rectifier->regulator) not have any kind of input ...
0
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3answers
89 views

Recommended capacitor rating for this mains zero-crossing detector

I found this zero-crossing detecting circuit here I want to recreate it, using the parts that I have on hand (or can get cheapest), but I'm not sure how to choose the correct 0.1uF capacitors. ...
0
votes
2answers
71 views

Power Consumption on 220VAC vs 120VAC

I have an appliance that consumes 5mA when in standby on 220VAC mains. I'm assuming on a 120VAC 60Hz system it would also consume 5mA in standby (can't measure it). Since I haven't measured it, I ...
2
votes
1answer
63 views

High dielectric strength temperature sensor (2500V)

I am trying to measure the temperature on a heatsink that is at Earth ground potential, while my circuit ground is at line potential. Typically I would use something like the Microchip MCP9700 in a ...
2
votes
4answers
242 views

Mains LED light bulb flickers when switched off [closed]

We have LED bulbs in our apartment. In the bathroom, the bulb flickers on and off when it's switched off. Same when it was a CFL bulb before I switched to LED cause I hate CFLs. Our mains voltage is ...
0
votes
1answer
55 views

Raspberry Pi controlled lamp using a relay & mains procedure

I am trying to turn on and off a lamp I have at home using a relay controlled by my Raspberry Pi. Here are the exact parts I will be using: Raspberry Pi B+ My lamp: My relays: Potential ...
1
vote
0answers
43 views

Will “dimmable” 120VAC LED bulbs work on half-wave-rectified power? [closed]

My stove's vent hood has a pair of 120VAC 50W MR16s with GU10 bases, e.g. these halogen bulbs. These are some of the last incandescent bulbs in my house, and I'd like to replace them with something ...
3
votes
2answers
65 views

line voltage on live line 220v

I need the input from you electro-wizards. I'm in the Philippines, the power is 220v, 60Hz. In most places there is an absence of a ground line. Lots of people in our area have issues of getting ...
0
votes
4answers
96 views

Opto-coupler output

I am using this circuit for mains detection: The output fluctuates a little but capacitor and resistor values ensure that Output is logic HIGH when 220V mains is present. Once mains is not ...
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votes
3answers
73 views

Splitting mains power into multiple relay-switched circuits

Summary Introduction My goal is to split a 1-gang mains power extension lead into three, have my Raspberry Pi plugged into one of the outputs, and have the Pi able to switch the other two outputs ...
1
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0answers
41 views

How do I create a visual and/or auditory indication that an inverter has switched off and the mains are back on?

EDIT I came to know that o/p of inverter is AC. I apologize if I sounded silly previously. To be more specific, How do I create a visual indication an audio indication in my living room such ...
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votes
1answer
50 views

What to use to switch AC power supply using 5v micro controller? [closed]

Here is my question and situation in more details. I am working on a college project where I need to switch on/off AC appliances using 5v Micro Controller. Appliances can be fan, motor, Fridge, Air ...
2
votes
2answers
205 views

Why 220V and 110V?

Why did the industry choose these seemingly unintuitive values of 110V and 220V for the mains AC? Is there a physical reason why they aren't simply 100V and 200V?
0
votes
1answer
105 views

How to design a 2 way switch using Triac and SPST standard switch?

I have a triac which I turn ON and OFF by giving a gate pulse through microcontroller. With the help of triac I turn ON/OFF a light in my bedroom. The bedroom light is connected to a standard SPST ...
4
votes
3answers
378 views

Will mains kill me if I'm using an adapter?

I'm sorry this is an ignorant question. I am working on hooking up leds for my raspberry pi. I keep hearing about mains power and how dangerous it is. I'm using a 5v adapter that is plugged into an ...
0
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2answers
101 views

Linear regulator with external switch

I need to obtain 5V stable week power supply from a 230VAC power line. I need this as cheap and as small as possible. Fortunately I don't need galvanic isolation and required current is as low as 1-2 ...
5
votes
2answers
546 views

Why is the upper hole in a plug point bigger than the rest?

In a plug point you can see that the upper hole is bigger than the other holes in it. Why is this hole bigger than the other two?
3
votes
1answer
68 views

What is the difference between flux and flux-linkage? how to calculate inductance of transmission lines?

in calculating inductance of a single current carrying conductor how flux linkage is calculated?why flux is multiplied by a factor (X^2)/(r^2) to get flux linkage. see the following images:
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1answer
62 views

How to rectify a 230V mains supply to charge a capacitor bank for a xenon flash

I want to rectify and step up a UK mains supply for a hobby xenon flash project. I have a good knowledge of the rest of the circuit design, but I want to know more about the power I can get before I ...
0
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0answers
52 views

Mains hum on battery-powered prototype

Beginner's question. I have a battery-powered MSF ("radio-controlled") clock running on 1.5-volts. I am aiming to use it's alarm output to provide an accurate "time signal" for other equipment. The ...
1
vote
1answer
33 views

How do the NEC Article 460 requirements apply to small capacitors mounted outside of equipment?

NEC Article 460 discusses the use of capacitors in electrical circuits outside of equipment. However, these requirements are designed for large power capacitors, oftentimes using liquid dielectrics ...
1
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4answers
85 views

Watts used by chargers eg laptop, wall warts etc

This is my first question on here, its quite easy and I am sure I have half the answer, maybe. I was thinking about how much power was being used by these wall chargers etc, you read the label it may ...
2
votes
1answer
79 views

Non-contact mains voltage measurement

I am trying to develop a non-contact whole-house power usage monitor. I have reviewed jasonT's project, which uses AC clamps to measure current usage. However, from reading this post on how meters ...
2
votes
1answer
341 views

What do “S” and “F” markings on this transformer mean?

I previously wrote this post on identifying a transformer with P241-5-36 inscribed on the top. I now understand which coil is primary and which is secondary. Looking at the datasheet for this ...
3
votes
1answer
70 views

Measuring current in independient circuits

I'm doing a project to monitor and control 5 separate air conditioner units in my house. The AC Units run in 240V power (two 120V phases), each unit has its own breaker in the box. I'm using five ...
0
votes
1answer
71 views

Is it possible to run 240V 30 amp service over doubled 12wg Romex line wires? [closed]

I have some existing Romex 12/2 installed on my machine. If I doubled the conductors used for each of the two line wires needed, would that adequately carry 30amps at 240 volts? This will be in open ...
2
votes
5answers
148 views

Is it a good idea to connect the Neutral point to your common ground in your PCB?

I am making a PCB that uses AC Mains power where 120VAC is converted to 5VDC with the help of AC/DC converter. The 5V output is then supplied to my digital circuitry. The main confusion I have is to ...
0
votes
2answers
220 views

Can I connect 500K resistor directly to the mains?

I would like to test what will happen If I put a high resistor between 220V AC terminals. My calculations says that it is possible, but I asked this question to know the practical point of view before ...
0
votes
2answers
71 views

Electrical connection that is “AND NOT” gate

I need to create an electrical switch on normal net voltage (230V) that sort of acts like an "AND NOT" gate. All I have at the moment is three copper wires and some connectors. Obviously, when I just ...
2
votes
3answers
137 views

Are plastic enclosures safe for hobby mains voltage projects?

This may seem an obvious /silly question, but bear with me because I want you to consider it from a pragmatic view point. I have a fledgling project that will be mains powered and fit in a space ...
0
votes
1answer
36 views

Transmission transformers

Why are Star-Star transformers not used in the transmission of power at high voltages which would reduce the cost of transformer(as lesser insulation needs to be applied across the phases). And for ...
0
votes
1answer
85 views

Arduino with L298N Motor Driver and external Power

I would like to control a slave clock which requires 24v applied for approx 1/2 second in alternating directions once every minute and have bought a Arduino Uno to control the pulses. The Arduino is ...
0
votes
1answer
74 views

Clamp TO-262 transistor against heatsink?

I'm designing an enclosure for a device with mains voltage power mosfet devices. First I thought about using TO-220 MOSFETs, and mount them up against the aluminium enclosure. However, screwing them ...