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What is the color assigned to the high leg conductor of a 4-wire delta secondary three phases?
Wiki User
∙ 10y ago
Assuming you are talking about a 120/240v delta system the color coding is as follows.
Phase A(120v)-Black
Phase B(208v "Wild leg/High phase")-Orange
Phase C(120v)-Blue
There are other color coding methods but this is the most common.
Wiki User
∙ 14y ago
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What is the impact of reversing the polarity of a CT in a 3phase and 4wire metering arrengement?
The net measured power would appear to be negative, or reversed.
Is delta connection also called a star-star connection?
the delta has a higher voltage to ground on the B phase and is identified by the orange color for identification means so its easier to smoke equipment if not careful.hardly see delta connections anymore so old school and outdated. it just makes economic sense to use a star connection.On the above answer there should be no voltage to ground on a delta connection. All three phase coils are connected in series with each other and at no point in the delta are they grounded. Most of the commercial and industrial motor connections are connected delta. In installations where the motor inrush is above utility company specifications the Star- Delta connection is used. This limits the inrush current in the star configuration and then after a time delay connects the motor in a delta configuration. With delta systems the use of grounding lights are mandatory. These are used to detect if a phase grounds out. One phase and the motor can still be in operation, two grounds represent a short circuit and the system will trip.CommentThe second answer is not altogether correct... In the USA and Canada, it is common practise for one phase of the delta-connected secondary windings of a three-phase transformer bank, to have an earthed (grounded) centre tap. With each phase providing 240 V; the centre-tapped phase then provides a combination of 240 V line-to-line together with two 120-V line-to-neutral (earth) voltages which is the standard supply method for residences in North America. The point of common connection between the two remaining phases is termed the 'high leg' of that particular transformer connection, having a potential of 208 V with respect to earth (although this is not used). To summarise, this method provides a 240-V three-phase supply, combined with a single-phase 240/120-V supply, which is useful for small businesses (e.g. garages) which might need to operate three-phase motors.However, the second answer is perfectly true for the UK (and, possibly, elsewhere in Europe) where residences are supplied with just one voltage (230 V) -unlike North America- and delta-connected supplies are relatively unusual.
What is the impact of reversing the polarity of a CT in a 3phase and 4wire metering arrengement?
The net measured power would appear to be negative, or reversed.
What will be the voltage drop at a distance of 10KM from source in a 415V 3phase 4wire 50Hz 4000Ampere system busduct?
This seems like a question from an electrical course, and is probably best answered by referring to your course materials. It's your test question, not ours, and there won't always be someone else to ask for the answer. Earn your diploma.
What are the wire connections to a L14-20P plug?
A L14-20P is a 3 pole 4wire 125/250 volt grounding plug. The four wire (white, red, black and green) cable connection will be, white wire to the W terminal, red to the X terminal, black to the Y terminal and green to the G terminal. The X and Y terminals wires (red and black) can be interchanged so that there is no cross over of the conductors as they protrude from the cable jacket.
Can you get 120 volts from a 480 volts 3 phase Y generator?
NO, the 480 Volts Y -- is 4 wire system, with three wires which are hot legs @ 480 volts between each three hot legs. A mid tap is a neutral leg (ground) the white wire. Which gives 277 volts between it and any of the three hot legs. so a 4wire 480 volt Y system. Gives 480 /277 volts.
Where do the hot wires go when rewiring a old dryer outlet to a new outlet box?
The question is not clear. If the dryer heats with electricy, the circuit should be a 4wire circuit two wires are ungrounded probably red and black, one grounded wire white (neutral) one grounding wire (green or bare). Red and black go the the side terminals, White usually goes on the top terminal, and green is on the bottom. Normally a # 10 wire is used with a 30 amp 2 pole breaker. If you don't know what you are doing, call a quilified electrician or inspector. Electricity is dangerous.
How do I wire a new 3-way switch. I can't follow what my book says.?
you need the following wire should be 14-3 wire and two three way switches 14 -3 wire has 4wire in the bundle 1white 1black 1 copper and 1 of a different color this wire runs from switch to fixture to switch from power source tie copper wires together from source ( this is a ground )tie to fixture ground tie black wire together from source this should be the hot leg tie white wire together from source ( this is a Neutral) fourth wire runs from switch to switch wire nut together at fixture follow switch instructions all else fails call electrician
How do I wire a new 3-way switch. I can't follow what my book says?
you need the following wire should be 14-3 wire and two three way switches 14 -3 wire has 4wire in the bundle 1white 1black 1 copper and 1 of a different color this wire runs from switch to fixture to switch from power source tie copper wires together from source ( this is a ground )tie to fixture ground tie black wire together from source this should be the hot leg tie white wire together from source ( this is a Neutral) fourth wire runs from switch to switch wire nut together at fixture follow switch instructions all else fails call electrician
Why voltage is coming 230v if you measure in between phase and neutralin 415 v 3ph 4wire system?
240V is, of course, the phase voltage for three-phase, four-wire, system having a line voltage of 415 V. But these values are 'nominal' voltages, not actual voltages. Actual voltages are allowed to vary above and below the nominal voltage, as specified in the relevant government legislation. Assuming an allowed variation of plus or minus 6%, that means the line-to-neutral voltage could be as low as 225.6 V. So, it would be perfectly normal for you to measure an actual voltage of 230 V, line to neutral, for a system rated at 415/240 V. For many years, the nominal voltage, and allowable variation in the UK was 415/240 V (plus or minus 6%). However, in order to comply with EU 'harmonisation' rules, the nominal voltage is now 400/230 V (plus 10%/minus 6%) -the change in permitted variation allowed the UK to use a new nominal voltage without going to the trouble of actually changing anything -in other words, the UK system remains unchanged, at 415/240 V, but the 'official nominal' value is now 400/230 V, and the difference is catered for by changing the allowable variation!
Can you install a four prong cord to a three prong dryer?
To change the cord of a dryer from a 3 wire to a 4wire, do the following: 1 remove the wire terminal cover, usually just above where the cord enters the dryer. 2 you will notice three terminals, the center terminal will have a white wire attached with a black or red on either side. The white wire terminal should have a bonding strap attached to it and to the metal frame of the dryer. Remove this bonding strap and save the screw.3 Remove the red and black wires from their terminals. 4 Remove the wire clamp and remove cord. 5 Insert new cord in wire clamp. 6 Connect the white wire to the center terminal. 7 Connect the green wire with that screw you saved to the metal frame of the dryer. 8 Connect the red and black wires to their terminals. 9 Replace terminal cover and you are done!
Is delta connection also called a star-star connection?
the delta has a higher voltage to ground on the B phase and is identified by the orange color for identification means so its easier to smoke equipment if not careful.hardly see delta connections anymore so old school and outdated. it just makes economic sense to use a star connection.On the above answer there should be no voltage to ground on a delta connection. All three phase coils are connected in series with each other and at no point in the delta are they grounded. Most of the commercial and industrial motor connections are connected delta. In installations where the motor inrush is above utility company specifications the Star- Delta connection is used. This limits the inrush current in the star configuration and then after a time delay connects the motor in a delta configuration. With delta systems the use of grounding lights are mandatory. These are used to detect if a phase grounds out. One phase and the motor can still be in operation, two grounds represent a short circuit and the system will trip.CommentThe second answer is not altogether correct... In the USA and Canada, it is common practise for one phase of the delta-connected secondary windings of a three-phase transformer bank, to have an earthed (grounded) centre tap. With each phase providing 240 V; the centre-tapped phase then provides a combination of 240 V line-to-line together with two 120-V line-to-neutral (earth) voltages which is the standard supply method for residences in North America. The point of common connection between the two remaining phases is termed the 'high leg' of that particular transformer connection, having a potential of 208 V with respect to earth (although this is not used). To summarise, this method provides a 240-V three-phase supply, combined with a single-phase 240/120-V supply, which is useful for small businesses (e.g. garages) which might need to operate three-phase motors.However, the second answer is perfectly true for the UK (and, possibly, elsewhere in Europe) where residences are supplied with just one voltage (230 V) -unlike North America- and delta-connected supplies are relatively unusual.
How do you connect the NEMA L5-30R outlet?
A NEMA 14-30P is a plug. A 14-30R is a 3pole 4wire grounding receptacle for 125/250 volts. To wire the receptacle connect a three wire cable's red and black wires to terminals X and Y respectively. Connect the cable's white wire to the W terminal and the ground wire to the G terminal.
Where is the cooling fan relay on 1996 Dodge Grand Caravan?
It sits on the left side chasiss in front of the engineI thought this answer was a lille vague so I am adding: The cooling fan relay on a 1997 Dodge Caravan is located just in front of the very bottom of the arbox and can be reached most easily from the bottom of the car with a 1/4 inch drive ratchet with an 8mm deep socket. You must squeeze the clip to remove the wiring pigtail (4wire) from the relay which faces down at about a 45 degree angle towards the rear of the car.For those who don't have a lift and don't want to crawl. Remove the air cleaner assembly (2 10mm bolts through air plenuum on the radiator support 2 hose clamps, (one on intake boot and one between air intake plenum and air box) one air filter, one 10mm bolt on the top of the airbox and tilt the airbox towards the center of the vehicle to remove it from the rubber supports on the bottom) and you will be able to see the cooling fan relay at the bottom of the car on the Driver's side at the inner firewall.I looked the part up on Rock Auto's website and Airtex manufacturing's website and the part is the same from 1995 - 2000 for the Dodge caravan. I would look carefully to see that the wiring harness connector, (pigtail as it is commonly referred as) is not burned as this is a common problem on the 1997 Dodge Caravan radiator fan motor wiring system. The relay is activated by the ECM, (Fuel injection computer called Electronic Control Module) based on inputs from the a/c relay, (high a/c pressure), temperature switch, (high coolant temperature), and speed sensor, (most modern cars will not allow the fan to run when the vehicle is over 30mph as the fan is of no use but to slow the air down and cause electrical strain unnecesarily which is why the ECM took over the job).Checking the cooling fan system before and after repairsStart the car and turn on the a/c. After about 15 seconds the high side a/c hose should be hot to the touch if the a.c is working. If the fan does not come on with this high pressure shut the a/c off till the vehicle is moving or you WILL blow something as the a/c high side pressure may reach over 375 psi with no fan to cool the condensor. Next shut the a/c off and allow the engine to reach 205 degrees, (about 7-10 minutes from a cold start on a warm day and idicated by the temp guage reading just above the halfway mark) and the fan should come on from engine temperature when the computers gets a reading from the temp sensor that the coolant is hot enough to need the fan and the vehicle speed sensor is indicating that the vehicle is not moving fast enough to cool itself.One more note is that anytime the fan is supposed to be running from the aforemetioned conditions and it is not. Tap the fan motor LIGHTLY with a screwdriver hadle because these fan motors do die occasioanally but Dodge fan motors are pretty reliable and not usually the problem. Honda, Toyota, Hyundai, Nissan and Suzuki fan motors do go out regularly after a few years of service.This system works very well to keep the engine at a stable warm temperature to promote good power and fuel economy/ air quality while using very little resources. I hope this helps clear things up a bit.
