Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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1answer
69 views

Wiring a single phase electric motor with a run and start capacitor

I have a single phase electric motor provided with the following wiring diagram. The wiring diagram unfortunately omits the active line and neutral connection details. I've had a look at several other ...
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1answer
45 views

Single and 3-Phase Load Calculations

I have a probably obvious question about powering single phase loads from two legs of a 3 phase supply and how this impacts current draw calculations. This is something that is commonly done in my job ...
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38 views

Which one is the real single phase two wire circuit?

Which one is the real single phase two wire \$(1\phi2w)\$ circuit? i have seem these two type,and both of them were be written in some books Type A: https://slideplayer.com/slide/5867350/ 0:35 in ...
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1answer
48 views

welling yxb-250-4 induction motor spin start direction is inconsistent

This motor is also often referenced as W11283592. The best pictures of it are in http://www.gmcc-welling.com/Homeen/Product/detail/id/187.html and https://partsdr.com/part/w11283592-drive-motor. The ...
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2answers
46 views

Will this 3-phase 208Y/120 setup work [closed]

OKAY...electrician I had out recommended the following setup to supply 3-phase wye 208/120v off of 240V single-phase. My device is pulling 30 amps, and my entire load is about 15KVA. It's impossible ...
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2answers
69 views

Converting single-phase 120 V or 240 V into three-phase 4-wire 120/208 V

I am needing to convert either 240 V or 120 V single-phase into 120/208 V three-phase 4-wire. The load needed is 30 A. My panel can supply up to 100 amps, so the amperage isn't an issue. I've looked ...
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0answers
59 views

Single phase neutral current & three-phase neutral current with respect to kirchhoff's law

In the below schematic, would be the sum of all current in the single phase neutral wires equal to the current in neutral wire going to the 3 phase main disconnect? In theory, we know that if the 3 ...
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393 views

I have a AC motor with 3 wires. Black, red and white. How can i connect the capacitor and to power supply as shown on the diagram?

Please help me to understand the diagram attached. I have a motor with three wires. Black, Red, White. and a Capacitor with 2 wires(both Black). 1. How to connect the capacitor to the motor 2. How ...
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1answer
105 views

DIY Single phase transformer to split phase

I am not changing voltage, just splitting the phase. Would this work? 240V single phase to 240V split phase 21 windings on the primary 21 Windings on the secondary Center tap the 11th for N Primary ...
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3answers
67 views

Wire size & current capacity

I recently came across with the catalogue where the wire sizes and their specifications are listed. In that, there was a specification "current carrying capacity - 2 wires single phase". What does ...
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1answer
75 views

How to convert output from a split phase inverter to single phase with only 1 hot?

Here in USA, we use split phase 240VAC 60Hz. In Philippines, they use single phase 220VAC also 60Hz. How do I make an inverter designed for 240VAC split phase output work properly over there in ...
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3answers
887 views

Why is the three-phase voltage 440V, if single-phase alone is 230V?

Why it is not 230V ×3, why only 440V?
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2answers
3k views

Can I hook up a single phase switch to an electric wood splitter? [closed]

Good day. I have a 5 ton Yardmax electric wood splitter that I would like to add a single pole foot pedal switch. Right know there is a Kedu HY56 switch built in. The motor has 4 wires (2 blue, 2 red)....
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1answer
96 views

Electrical wiring help - generator

I'm trying to replace a regulator for a single phase generator. There is a symbol I don't understand. What does this symbol mean? Full diagram:
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2answers
45 views

L and N switched, from a functional point of view, what difference does it make for the device being powered?

Consider a generic single phase AC 240 V (or 125V) device for home use such as a hair dryer. From a purely functional point of view, what difference does it make if a phase is switched with the ...
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0answers
64 views

Calculating the value of current-limiting reactor in single phase dual converter

I'm having a problem calculating the reactor's value in single phase dual converter. As you may know, the reactor shown in the picture below is to limit circulating current caused by the voltage ...
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31 views

Calculating speed of the rotor with slip

The question i'm having trouble with is: Calculate the speed of the rotor of a 6 pole induction motor with a slip of 2.2%. The motor is connected to a 230V single-phase supply. I am familiar with ...
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3answers
511 views

Controlling the speed of a single speed AC exhaust fan motor

I have this single speed exhaust fan: 30" Exhaust Fan with Shutter - Direct Drive - 1/4 HP - Single Speed. When it's running it's way faster and louder than I'd like it to be. So I'm trying figure ...
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2answers
363 views

Does only wiring 2 poles of a 3 pole overload relay have any effect?

When wiring a single phase starter, they tend to jumper the overload such that all phases of the overload are used. Now, considering that the overload has 3 separate bimetal strips all connected to ...
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1answer
52 views

Converting single-phase to three-phase for City & Guilds 2391 practical

For my City and Guilds 2391 course, I will be testing a three-phase distribution board with a motor and single-phase sub-main. I am finding it hard to memorize the test procedures. So for me it's ...
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1answer
278 views

connecting single phase motor to UK mains AC

I have a single phase single volt (UK 220-240) 1Hp electric motor with two capacitors, start and run. As photographed. This is to run my Milling machine. I need to connect the motor, via ...
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1answer
32 views

Loading one line from Three Phase Power Delta Configuration

I have been trying to determine whether or not I can run one line from 3-phase power into a power conditioner that requires single-phase input. The current draw on this line would be around 10 A. ...
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1answer
33 views

Calculating reactive power on kVAr?

I think I understand how to answer this question but am missing how to do a certain part which stops me from getting their. For this question this is all I know how to do. cos-1(0.31) = 71.94° ...
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2answers
50 views

Understanding the failure mechanism of capacitor

Most ceiling fans and table fans designed for household use, eventually slows down before completely failing to work. By close observations I found these fans are using capacitor-split-phase motor ...
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1answer
327 views

wiring electric motor to run CW without name plate or diagram information, other than my diagram of it running CCW

Motor does not have name plate or diagram. It is running CCW rotation now. From my wiring diagram is it possible to re-wire to run CW? Thanks for your help.
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1answer
398 views

An overseas company is making a machine for me and they need to know whether I want 1,2 or 3 phase and what voltage

I'm in Quebec and the company making the machine is in China. The machine is an industrial sized T-Shirt sublimation machine that does two sided printing. So there's a large heated plate that is ...
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1answer
291 views

Transformer Sizing with Mixed Loads (Three-Phase & Single-Phase)

I am trying to size/validate the rating on the medium voltage main transformer for an industrial plant. For some reason I can't find many resources that indicate how to properly do this when you have ...
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1answer
38 views

Can AC voltage phase change across an SSR?

I got an SSR (Picker PCS15-D-240A-25ZL) to control a single phase 240VAC North American circuit going to a heating element on a homebrew setup. One of the load wires goes through the SSR and the other ...
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0answers
409 views

How to identify and wire leads on a one phase 6 lead, capacitor start, capacitor run electric motor

The leads are labeled U1, U2, U5, U6, Z1, and Z2. My research has found wiring diagrams on 4 lead motors where U1 & U2 are main winding and Z1 & Z2 are auxilary winding. Start capacitor wired ...
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0answers
658 views

2 pole single phase induction motor appears to have starting capacitor permanently connected (no centrifugal switch)

I am trying to repair and rewire an AC induction motor from a small compressor. From what I can tell it's a 24 slot, 2 pole single phase induction motor that has main coil and starting coil. The ...
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1answer
217 views

Capstone PCB for a Single phase power energy meter

I am an EE major in the process of working on my capstone project of developing a PCB of a Single phase power energy meter and I need help scrutinizing it. I Intend to interface this circuit with my ...
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3answers
7k views

How to connect this 3 wire AC motor?

I have this NEW heat recovery unit from Amazon (shady quality, branded as made in UK but actually made in China) with this motor inside. It was supposed to have two speeds (Low/Hi). Question: How ...
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3answers
156 views

What enables the home appliances and electronics to work on single-phase?

Talking about the home appliances and electronics, if it is single phase that we are using in houses and currents get to zero every half cycle, how do the home appliances (using AC) and electronics (...
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2answers
563 views

What will happen if we use an Inductor in place of a Capacitor in Single phase Induction motor

So as the titles says, well i know that a capacitor give phase shift and that results in a rotating Magnetic Field. So i was wondering what will happen if we use a an inductor, i mean doesn't it ...
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3answers
188 views

Why are the diodes in this circuit forward biased in spite of no current flowing through them?

Considering the following circuit, Normally in the +ve half cycle SCR1 is triggered after it takes its triggering gate pulse and then D2 becomes intrinsically forward biased so it's on and conducting ...
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2answers
75 views

Little torque of single phase asynchronous motor

I have a single phase asynchronous motor rated 230V, 500W. It has three terminals labeled U, V, W. I connected L1 to U and N to V (other way round makes no difference though). Between V and W is a ...
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0answers
70 views

Is there a cost savings associated with 3 phase power at the same device power requirement (kW)?

I am a Mechanical Engineer looking into purchasing an annealing furnace and have seen that some operate on single phase power while some operate on 3 phase power. I've done some research and have seen ...
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1answer
1k views

single phase 120V convert to 3 phase 208V

Can you convert 1-phase 120V into 3-phase 208V? If yes, whats the simplest way to do that?
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2answers
809 views

Ceiling Fan Speed Control stripped down

I am a novice but know enough to get by. I was given an older Hunter Fan that is only operated via Remote. I have cut the receiver out because I do not have the remote and from what I have read they ...
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1answer
332 views

What is the most efficient 3-phase to single-phase AC transformer for a home grid

So a friend of mine is getting electrical power installed for an urban site he bought, and I'm just trying to be a good friend by looking into this. The company doing the installation recommended he ...
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3answers
2k views

How are the individual homes connected in a 3 phase power distribution system (power grid) so that they have correct voltage?

For a single phase distribution system it's simple, each home has one wire coming from the neutral and one from the live, in turn each outlet has a live and a neutral wire. The live is 120V relative ...
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3answers
20k views

Three 1 phases vs one 3 phase power cost

Case1: If I have three single phase connections with each having its own single phase energy meters And I connect 1kw load on each of these phase continuosly 24/7 for a month. Case2: Now next month ...
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1answer
91 views

How do we design a control system with a mix of single-phase and three-phase electrical loads from a three-phase supply?

I have connected a three-phase incoming power to a MCCB, MCCB will distribute to a 3-phase transformer as well as few single phase equipment, which is means outgoing of MCCB L1, L2 & L3 to ...
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2answers
1k views

How is a higher torque achieved in a single phase cap-start cap-run motor?

The starting winding come capacitor circuit is there for starting the motor. When the motor reaches 80% rated speed, the centrifugal switch cuts the starting circuit out and leaves the run winding ...
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3answers
4k views

How do single phase BLDC motors start in proper direction?

There are descriptions on internet of the single phase BLDC motors which are powered by Vdc (such as PC cooling fans 12V). Interestingly pictures shown describing outrunner type with equal number of ...
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1answer
2k views

Single Phase Induction Motor Wiring help

I have purchased a Single Phase Induction Motor that runs anti-clockwise, I require it to run clockwise however I am unable to figure how to change the wiring to do this, any help would be appreciated....
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3answers
1k views

Can I use dimmer voltage regulator for single phase multi speed AC motor?

I have a swamp cooler motor which is single phase 3 speed motor, 1/7 HP i.e. 106 watts. I wish to reduce its speed (rpm) by 50%. Can I use this dimmer circuit to do so? This dimmer regulator is rated ...
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1answer
75 views

3Phase + Neutral, 208VAC distribution and conversion to 1Phase 120VAC

Question 1: How to convert 3phase+Neutral 208VAC supply to 1phase 120VAC? Can I tap off one (any) leg of the 3phase supply and use that to Neutral to get the 120VAC? Or do I have to use all three ...
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3answers
4k views

AC 220v Single Phase Motor Control using relay

i've been looking for a diagram for motor control using arduino and relays, and i only found tutorials using DC motors. i know you can use a contractor but for my project i want to be able to use ...
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1answer
253 views

Can a triphase current regulator be used with just two phases?

My house is located somewhere with power problems, these have been going on for 15 years and will probably never be fixed. Family lives next door and I want to regulate the power to both my house and ...