The home circuits are often heated, empty and frequent jumps, lamps are dazzling and dazzling, plugs are hot, wires are getting older, and many electricians come up and open and rewire and cure the symptoms. In fact, more than 90 per cent of these complications are rooted in excessive zero-line electricity。
The zero line is not visible, but is a reflow lifeline for the entire household circuit. Once the current is exceeded, the electricity is used in an abnormal manner, the electricity cost is lost, and the heat of the line is insulated and fires on short roads, with serious safety risks。
Ordinary electricians change parts blindly and senior electricians use four-step standard checks, do not break walls, change wires, quickly locate the root causes of the zero line overload and solve the problem once and for all. The principles, steps, criteria of judgement are used throughout the process in plain language, as can be understood by the zero basic owners. The knowledge of the safety of domestic circuits is consistent with national norms of electricity use, and is not exaggerated, unexplored and dry and practical。
First, understand the rationale: why is the zero line too high
The standard pattern for single-phase domestic circuits is a fire wire inbound, zero-line back-flow, normally distributed in a three-way equilibrium, and zero-line currents are minimal and almost negligible。
According to the national low voltage distribution code:
Zero-wire current for normal household < 30% >
Once zero-line currents are approaching, even beyond the fireline, they are severe overloading anomalies
This is not too thin, mostly due to faulty distribution of lines, jamming interference, load imbalances, leaking power mixes and zero mixing。
Common hazards are very intuitive:
1. Zero-line wires heat up and the insulation layer accelerates ageing, hardening and cracking
2. Frequent improvisation of electrical leaks and unprovoked breakout
3. Led light flashes, leds microlighted and lights turned off
4. Electrical casings with electrical power, touch outlets, sterilisation of household electricity
5. Fastening of metering and excessive consumption of electricity for no reason
6. Long-term abnormality with high risk of short circuits and electrical fires
Many families ignore the zero-line problem, and several years of dark-line burning can only be used to break walls, multiply costs and learn to screen ahead, save money and keep security。
Ii. First step: power outages, distinguishing between three imbalances or one-sided anomalies
Zero-line failure, safety always comes first, and all operations must break the main gate, confirm that there is no electricity and no electrical operation。
The first step is to sort out the type of failure quickly:
1. Single-household table: inspection of home-based zero-fire return load only
2. Unit zero: multiple zero lines shared throughout the building, and an abnormally large building
Most of the old neighborhoods use shared zero-line circuits, the neighbor's house is ill-equipped, and the zero-line line is poorly connected, and your house is running up。
With pliers, you'll hold the line of fire + zero at the same time:
Normal circuit: 2-phase electricity current offset, reading close to 0
Zero line over-facing: the readings are clearly high, and the bigger the value, the bigger the problem
The method does not have to break the lines, and a second to determine whether the zero line is abnormal or not, it is also the fastest means of screening a professional electrician。
Iii. Step 2: harmonic interference, domestic use of leds, switch power is a disaster area
Now, more than half of the household zero-line electric currents are coordinated, which is an invisible failure that new electricians cannot understand。
Domestic led lamps, plug-in chargers, roof boxes, routers, variable frequency air conditioners, water purification units, sensor lamps are all on switch power loads。
This type of equipment works with high-frequency hybrids that do not follow normal circuits and accumulate all over the zero line, resulting in a surge in zero-line coordinated currents。
Zero wire is overloaded, even though it's low power:
• a flash of zero-line currents
• non-opening of large-power appliances continues to cause heat jumps
• lights blinked thinly after lights were turned off
The way to judge is simple:
All led lights, chargers, weak electrical equipment were shut down and zero-line currents were measured。
There was a marked decline in currents, which was determined to be the zero-line overload caused by the accumulation of the waves。
It's a solution:
Zero wires are fitted with a mechanized filter, circuits are re-organized, zeros are strictly separated, no mix is used, harmonics disappear immediately, and lamps are unflammed, unheated and unstoppable。
Step three: zero patches, circuits, old neighborhoods with high failure
In rural areas, there is a large number of self-built houses, old used houses, old buildings, and old buildings, with zero-line lines mixed, zero-line repeats and zero-line connections shared。
The national low-voltage distribution is clear: zero lines, land lines must not be mixed, connected or shared。
Once it's mixed:
Wire-borne, zero-wire-diversion disorders and large quantities of undispersed electricity flows into the zero-wire line directly resulted in zero-wire current excesses。
At the same time:
Electrical casings, leaks, failure of electrical switches, thunderstorms are prone to burning domestic electricity, and plugs are too high and low。
Queries:
Open plugs, distribution tanks, check the connections
Zero right on the ground, three colors. Line
Fireline red, zero blue, groundline yellow and green
Zero entanglements, dockings and sharings were found, all re-engineered。
The overhaul resulted in the direct restoration of the zero-line abnormal current and the elimination of one-off security hazards。
5. Step 4: unequal distribution of retraced loads, three-by-zero folded load
The electricity distribution tanks in the subdistricts are distributed among three-phase subscribers, with an average of a, b and c households divided。
If there is too much power in a particular connection: air conditioning, water heaters, heaters, chargers, there are serious imbalances。
The greater the imbalance, the greater the neutral zero-line current。
When severe imbalances occur, zero-line currents even exceed the line of fire, and the lines operate at chronic high temperatures。
Symptoms:
• the voltage is low and the light bulbs are high and low
• frequent jumps from the power peak in the summer
• zero wire burn, oxidation, fire
• a significant reduction in the space life expectancy
Senior electrician routing:
Measuring each of the three-phase currents and rebalancing household circuits
Large power appliances spread out to different lines, not stacking up the same circuit
The three parallels tend to be balanced and zero-line currents naturally fall to safety。
It is not possible for a single household to do this on its own, and it is sufficient to re-align the three distributions with the industrial electrician, which can be handled free of charge。
Additional hidden faults: zero-wire break-ups, dead-wires, joint oxidation
The loose, oxidized and poorly exposed zero-line connections can result in high circuit resistance, local voltage abnormalities and a sudden rise in current disorders。
Zero lines are typical of the following phenomena:
Lights are low, lights are high
It'll burn in a minute
Zero-line heavy local heat and black-carboned hair
Treatment:
Open the distribution box and check all zero lines
Tighten the loose screws, cut off the oxidized burning wire, and press back. Solid
Multi-zero entanglement knots are strictly forbidden
Many families with zero-line malfunctions are simply a loose screw, but for days they find no reason。
Vii. National standard safety values, no electricity for self-checking workers
National civil low-voltage distribution norms specify safety limits:
1. Zero-wire household cross-section, not less than the linear line of fire
2. 70 per cent of the normal running zero-line electric current line
3. Zero wires are strictly off-limits, fuses
4. Zero restrictions on sharing and mixing
No more than 15% of the triple imbalance
As long as it goes beyond that, it must be overhauled without delay。
There is no protection on the zero line, overloading does not jump and can only heat fire in silence, with a far greater hidden risk than the failure of the line。
Viii. Routine prevention: doing three things without a zero-line failure
1. Non-self-retrofitted circuits, non-syncling and non-discretionary high power equipment
2. The old lines regularly check zero-line connections to avoid oxidization
Reduced use of poor quality led lamps, poor quality chargers and reduced harmonic waves
4. Frequent break-off at power peaks, check the zero line at first and do not repeat it
5. Self-built houses and old houses conduct annual route security tests
Zero-lines, which appear to be invisible, are the core lifeline of household electricity security. There's nothing on the line of fire that can be seen. There's nothing on the line that can't be seen. There's a long-term anomaly。
Ix. Security importances
All methods of screening in this paper are in accordance with the national low-pressure electrical safety code and apply only to low-pressure 220v civilian circuits for domestic use。
High-voltage lines, power distribution boxes and public lines are operated by licensed professional electricians。
Damp environments, rainy days, humid hands are prohibited from accessing the circuits, are firmly free of electrical work, are regulated in a safe manner and electrical accidents are eliminated。
Many owners spend their whole lives focusing only on firelines, open spaces, electrical appliances, and never on zero lines, which are the biggest security hazards in their homes. The four-step check-up of the old electrician was followed by an excessive zero-wire current, flashing lamps, unprovoked jumps, heat of the line, a single finding of the root of the disease, the need for free payment, the need to change fittings and save money。
Has your family ever experienced a flash of light, an unnamed jump and a hot spot? Have you ever had a zero-line-related circuit failure? Do you also want to know what kind of home-based circuit tracking technique? Welcome to the comment area。
