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3phase
Three-phase electric power (abbreviated 3φ) is a common type of alternating current used in electricity generation, transmission, and distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power.
Three-phase electrical power was developed in the 1880s by multiple people. Three-phase power works by the voltage and currents being 120 degrees out of phase on the three wires. As an AC system it allows the voltages to be easily stepped up using transformers to high voltage for transmission, and back down for distribution, giving high efficiency.
A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power. Three-phase power is mainly used directly to power large induction motors, other electric motors, and other heavy loads. Small loads often use only a two-wire single-phase circuit, which may be derived from a three-phase system.
Hi All,
I have recently purchased a motor soft starter from aliexpress for a 3 phase motor
Before connecting load I measured the input and output voltages.
Input voltages between each phase is 400V. However when I measure the output, voltages (after timer delay) is different.
Output...
Hello - hope someone can advise please.
I have a recently purchased second hand Myford lathe which has a 3-phase inverter (Siemens Micromaster 410)
Lathe all works fine but regularly trips my RCCB 80A 30mA breaker taking out half of the board - usually when first powering on. The inverter is...
Hi I have a 3phase shop in a high humidity area in (Hawaii) and I'm having some issues with low voltage on the single phase outlets on the 120v side.
Every once in a while the electric goes out on the regular outlets but the three phase works perfectly fine.
Usually at night all the outlets...
Hi there, I've got a 3 phase compressor and a small 8500W single and 3 phase generator. My compressor has a large 32amp plug on it but my generator only has a 16amp socket so my question being can I swap the 32amp plug to a 16amp plug?
Sorry if this is a daft question.
Thanks guys 🙂
It's coming out anyway so it's a rhetorical question.
What do you you all think of this?
Bits of wire used to bridge the bus bars and don't single phase consumer units need a linked switched line and neutral?
Hey all. I have a Hobart LXe commercial dishwasher that Im trying to run on 3 phase power. The manual specifies 208-240/60/3 with an ampacity of 30 A. I have a 30A 3 pole breaker installed in my panel (and yes, I have 3 phase power) with one pole at 208v, and the other 2 at 120v. The connection...
Hi there
I have not done a huge amount of work on 3phase.
I am installing a Induction Hob as part of a new Kitchen refurb- to be specific the hob is NEFF T59FSRX2.
It is a 11,100W with the ability to power limit and support single or three phase connection.
NEFF have not provided great...
A customer recently lost power to part of their electrical installation. On arrival I found all IEC 60947-3 devices had supposedly tripped - including the main switch rated at In 400A. Excluding the possibility of someone tapering with the board, can anyone think of any other reason why this...
I was speaking to an Electrician a few years back as he was balancing out a 3 phase supply.
To me it sounded like he was trying to get close to each phase supplying roughly the same Kw's to both of the lines/live/hot.
Is this correct, if so how close do you have to be in this balancing stage...
Hi! Currently doing a job that they have decided against getting gas meters and going all electric.
Electric boiler 9.5kw
2x shower 9.5kw
Hob say 6.5kw
2x 32a ringmains
2x 6a lighting circuits
I understand they have had a 13Kva supply installed.
Obviously this will not be enough to run all...
Hi all,
I recently bought a CNC router and dust collector and need to connect it to my 3x380v+N power source.
I want the CNC router connected to the under/over voltage protection and the motor also connected to the overload protection.
Can someone please check if I connect the machines as in my...
I have a metal lathe, 1.5hp, 3phase, 575v motor. Can I just replace the motor with a single phase,220v motor? Would all the lathe wiring , switches, relays work? IF so, what HP motor should I buy? Thanks,
I'm looking to install a traditional coffee machine which has total power 3300w and the wiring supplied with it is brown L1, black L2, grey L3 & Neutal with earth.
How would this need to wired to operate on a single phase 16Amp supply?
Hi Lads,
You might think i'm a di*k already from the forum title but I desperately need some help. I've got a small business and if I wasn't skint, i'd obviously have an electrician come to advise me. I added some kitchen equipment to the warehouse - most of the equipment can plug in to the...
A number of 3 phase induction motors and a single phase motor are fed via a p.t.o driven generator. There is a small current imbalence between the phase feeding the single phase motor and the other 2 but this i think is acceptable. How much of a current imbalenbce in amps (A) would be deemed...
Collie & Duthie
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hey guys, ok basically a friend bought a 2nd hand thickness planer and asked me to do him a favour and wire it for him.i havnt much experience at this. first off i cant tell if the motor is single or 3phase, it has 400v and 220v written on the plate on the side of the motor. there is a...
Hi there...
Bit out of practice with 3phase design, and want to learn more.
Just want to check if this would be correct:
Ib = KW/V*1.732
Many thanks,
Sy
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