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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
Hi, Can someone give me some advice converning wiring up a 3 phase cabinet I am wiring up a cabinet to house a 3 phase inverter. Have have MCBs for each phase that are fed into contactors controlled by a safety relay. I want to power up a single phase 230vav in 24vdc out smp. I can connect between neutral and one phase of the 3 phase system. My q
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 (...)