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67 Threads found on Neutral Line
At single phase system, when there is a contact point between neutral and earth, would this cause RCCB/RCD tripped? RCCB/RCD current sensitivity is 300mA. Is it a normal behavior and why?
You are not specified the 3 phase voltage Assume 320V line to neutral You should select 1A 1000V diode (three numbers ) and an SMPS 230V to 12V@2A Hope it is helpful to you !!!
The problem is neutral may have up to 5% line voltage on it with line drop which exceeds CM input range. You could have it connected to line and floating from earth with CM chokes on sense wires and output thru IR isolated UART
Better to by inbuilt LED switch as below link Insert a fuse (based on the current rating) solder the output wire (1 line wire , 1 neutral wire , 1 earth ground wire) earth wire probably attached to chassis. Keep in mind that line terminal will go to fuse then switch and neutra
Slightly imbalance? I see a massive imbalance when connecting port 5 to ground and port 1 or 2 also to ground. Or does the unbalanced line not involve a ground? If both grounds are not shorted together, the outer conductor of the unbalanced line is no longer neutral and it's common mode impedance must be taken into consideration.
better to have line input to full diode bridge to 47K then to 0.1 -1uF cap in parallel with LED and cathode back to neutral. Collector output should go into Schmitt trigger with small RC delay to avoid glitches during " brown out" capiche?
Hi, if you are interested in isolating the line voltage using transformer, get a small current rated transformer core and rewind it. You can wind base on phase to phase voltage or phase to neutral voltage.
There are at last two meanings of isolation here. One for safety from lightning transients and one for common mode noise isolation between the AC and DC ground. Normally AC transformer line is earth grounded to what is called neutral (N) while the other line (L) is hot (H). There can be considerable current pulses on ground from various (...)
Hello, you may be familiar with the situation. You have old light wiring in your house, so there's one live wire and one wire going to lightbulb. And you want to roll your own smart switch connected to wifi or controlled by remote control. So you obviously miss the neutral wire and try hard to overcome this problem. i've came with this: [url=
More questions. - Does "without any transformers" refer to voltage measurement only or also to processor power supply? - Do you connect neutral line or 3 phases only?
i am having 3 phase supply r y b n, the voltage across r and neutral is 205, voltage across y and neutral is 190 , and final the voltage across b to neutral is 220v. now tell me what is the voltage between r and y terminals, that is line to line voltage, i know that the line voltage is (...)
Current is flowing in closed loops. neutral and live designation is a matter of circuit earth connection and doesn't affect the current flow as long no ground faults occur.
I wonder what's the actual need of correcting the polarity. Even with polarized mains connectors the neutral line in a device connected through a socket outlet must be expected to carry a potentially hazardous contact voltage. It becomes e.g. live if the neutral wire is broken. So if at all, a dedicated neutral terminal (...)
Hello all, I recently completed a stand-alone phase angle controller to control a heating element. My circuit is a "textbook" circuit using an LTV814 for the zero cross detection and a MOC3021 to control a TRIAC. Mains line connection goes to the TRIAC, then to the resistive element and from the element to neutral. For my tests I used an atmel m
Since you have a breaker (MCB) for the line circuit capacity, no neutral protection is required other than Earth grounding, which is always done in every last distribution transformer to residential or industrial application. If the power supply unit (PSU) has no short circuit protection, it could also have a smaller line fuse, based on (...)
In theory yes, in practice no. If you are ONLY using three phases, and are measuring the voltage between say R and Y you are probably safe to do as you propose but if it's a four wire system with a neutral wire as well ('Y' rather than delta configuration) and you are measuring R-N, Y-N or B-N you might have to take into consideration that differe
An additional comment about three-phase to DC conversion. Mentioning 78XX suggests that you are talkig about low power DC. So the only reason to connect to more than one phase of the three phase supply could be that you are missing a neutral line. In this case, you can use a single phase transformer with 400 respectively 200 VAC primary voltage
Seems that will burn out the Zener diode, once you´re using a 47R in series with 240Vac, what means a Iz peak current ranging on the order of 7.1A. Other point is that even adopting this kind of power supply, a series resistor, for safety reason should be placed not at the neutral side, but at the line side. Correcting my previous post
My specifications are as follows: 2 in phase 120V lines 1 neutral 1 Ground So, I should use a 240V GFCI, right ? This is the one I plan to use. 23250 003-1 GFCI So, connections would be connecting one 120V line to the line wire on gfci, 2nd line wire to the sec
THe Distribution transformer uses one centre-tapped phase to supply 240Vac in North America called line 1, line 2 and tap is neutral. Thus outlets are all L1+N or L2+N with safety ground. Thus every 2nd breaker taps L1 or L2 and goes throughout the home. Electric Stoves get L1+L2 for main oven heaters and only use L+ N for stove top (...)
Normally Vg is 2 diode drops fom MT2. Since MT1, MT2 are 4 quadrant with polarity AC should work, except one s Hot and the other is neutral. neutral is grounded usually only at transformer pole thus 5% of line can be expected on neutral from load drop. Verify your polarity and isolation of MT2.
That is a very dangerous circuit since it's not isolated form the AC line. It's okay if the final circuit is in an insulated case but you should use an isolation transformer when testing the circuit. Otherwise if the neutral and hot leads are accidentally reversed there will be the mains voltage on the circuit common. At a minimum you should plu
I am working on three phase voltage source inverter and PWM techniques. I've implemented SVPWM technique for this inverter using MATLAB and found line to line voltage, line to neutral voltage etc. I want to use filter to filter out Vab and Van. can anyone tell me what is the syntax for filter in MATLAB? which type of filter (...)
This may help: You can directly connect the MOV between power lines i.e. phase and neutral. Hope that helps.
If you have a neutral wire its a good idea - only 250 V from phase to neutral, also neutral can be your common (-?) line. Without a neutral , I do not think it is possible, unless you tie your output common line (- ?) to one phase which is extremely dangerous or you rectify the three (...)
We need to step down the voltage for line with respect to neutral right? The answer depends on the expected load and under which conditions you want to detect the faults. If you define "Open phase" as "voltage against neutral < xx volts", then you need to measure against neutral. But in case of a three phase load, the (...)
For 360 degs, T = 20mS, therefore for 80 degs T = 20 X 80/360 ~4.4 mS . I would re-arrange the circuit, so the load is attached to the live AC, the thyristor is connected to the "bottom" end of the load and connected to the neutral line. This makes your control/trigger circuits attached to neutral and not floating at the live and of the (...)
There is a 664 K to 1K attenuation of the line voltage before it goes into the IC. I can't see any connection to the neutral at all. Frank
I dont think that is smart to use fuse on neutral. Some fused instrument power connectors are using fuses for both lines. You should consider, that these instruments are usually suppied by unpolarized wall-outlets, in other words, there's no defined line or neutral. I think, the idea behind is that you get a fast (...)
so we cant use it where the person /or neutral line interfacing !:roll:
For an overview of earthing systems see In my view, you don't need much engineering knowledge to understand why TN-C (neutral used as common return and protective earth) is very unsafe. Just consider a broken neutral wire.
Details please.... line level, break time, switch over time., load dropout tolerance time? 1 or 3 phase? 3 or 4 wire? "Two methods are commonly utilized to prevent the "bump" from occurring. One is the neutral Position Delay (T.T.I. option code NDT). The other is the In-Phase Monitor method. "
In AC power for homes, they secondary of the step down transformer has a center tap that is called neutral and it is also grounded with a deep pole to moist soil. They call it single phase but these two lines are complementary phases line 1 & line 2 and 3rd wire neutral is close to 0V. In DC they ground (...)
TVS is a high speed fat diode intended for ESD clamp on DC and signal lines. MOV's are higher capacitance and low R, so work for power line transients on AC to neutral.
MOV's are used on AC line to neutral. TVS diodes are used on signal lines or any interface DC lines exposed to ESD. read here.
Are you in the United States? If so, then consider that US 220V is known by a variety of names, such as split 220V, that describe how it is wired. In other words, there is a neutral line ("grounded conductor", not ground conductor). The voltage is 110V from each live line (often two black or red + black) to this neutral (...)
Diode bridge is OK. But capacitor 400Vdc .... If supply is 220V line to neutral and 400V line-line then bridge DC-voltage is about 570Vminimum and capacitor 400Vdc is blasted away. Capacitor voltage should be at least 400V * SQR(2) + 10% = about 630Vdc
you can use neutral if you need and phase to null line voltage will be 220V,but usually 3phase loads doesn't need neutral line for operation, because the zero potential is created at the joint point of delta or star connection at the load side. also i must say that the equality of neutral and earth depends (...)
The power in 'n' phase circuit is given by n*v*i*cosine(angle between voltage and current). Here 'v' is the voltage between line to neutral. 'i' the current flowing in the conductor. 'n' is the number of phases. Use the same and calculate the current.
Many times one wire is already directly attaced to neutral of socket. This can be checked with a sme ups system it is connected when internal relay operates.
That image shows line (L1), neutral (N1), and Ground (GND) so it is single phase.
I have some doubt regarding placement of MOV in 3-phase circuit, genera;lly MOV is placed between line and neutral for each phase, but in some circuit i have seen that MOV is placed between neutral and i primary side ground of SMPS , how does it help in surge protection
line - neutral Voltage = Supply Voltage line - Ground Voltage ~ Supply Voltage (For testing purpose only) neutral - Ground Voltage ~ 0V (Theoretical, but practically it should be around 2 - 6 V) neutral - Ground Voltage value depends upon the quality of Earthing, a lower value is always preferred. If its (...)
3 are for line, neutral and earth. I guess two pins are line and neutral. With another words there is no earth. I dont know, but such connection is not allowed in certain countries (e.g EU).
I think you forget to connect one end of bridge rectifier to neutral line. NOTE : THIS CIRCUIT USES DIRECT 230V. YOU SHOULD BE VERY CAREFUL WHILE CHECKING. IF YOU ARE NOT EXPERIENCED, DONT TRY THIS ONE.
I would like to change neon lamps to LEDs. Can someone please modify this schematic? Thanks! I prefer 110v & 220 versions, pleaseeeee. 48820
hakeen, the AC network is 115V, line to neutral so 200VAC line to line. Delta load should be 200VAC. What do you mean by currents matching? Current balance?
I have a isolated switch mode power supply (SMPS) circuit. The output is good for my requirement. However, I need AC line zero crossing detection for my product. Since the DC reference is at different potential with the AC Live or neutral, I can not use the general zero crossing detection circuit. The only way I can think of is to make another n
I saw a smart switch with just live line as input. How can i design a circuit for controlling a relay with just live line of 220vAC?
Hi, could you someone help me in the polarization of a triac placed in the attached circuit? The TRIAC must switch the phase line andthe uP is grounded on the neutral. Thanks If a opto isolator is used, both circuits ie, the AC side and the micro side are isolated. Thus no need for grounding the micro to nuetral. If the ga