How to carry out electrical testing

how to carry out electrical testing

A Guide to Periodic Electrical Inspection and Testing

Nov 22,  · Enjoy our quick tutorial presented by our skilled trainer, Steve Redpath, on how to carry out External Loop Impedance (Ze) and Prospective Fault Current (PFC. Periodic Electrical Inspection and Testing carried out for the whole premises. People can do Portable appliances testing (PAT) for different electronics like heaters, television, etc. After every three years, owners should carry out the test for leisure complexes, places of public entertainment and theatres.

To create this article, 14 people, some anonymous, worked to edit and improve it over time. This article has been viewed 20, times. Learn more Test and inspect electrical products to help determine if they are suitable or safe for service or not. Log in Social login does not work in incognito and private browsers.

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Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article Steps. Related Articles. Author Acrry Last Updated: December 9, Check for obvious signs of physical damage. Accidental contact with energized parts can cause shocks, burns and even death. Manufacturers design and build electrical products to shield users from these parts with either insulated or grounded barriers.

When these barriers become compromised due to exposure, age, cracks or removal, the potential for serious injury grows exponentially. These insulating barriers include: plastic or rubber jackets on cords, non-conductive cases or bodies of tools carryy appliances that are "double insulated"; or have ground wires from cords extended to a metal case or body.

Check for signs of tampering. Manufacturers spend a great deal of time and money safeguarding people from their products in design, manufacturing and independent testing - such as "UL" Underwriter's Laboratories"FM" Factory Mutualetc.

Fasteners are designed to remain in place and ouy designed not to come out at all and show obvious tampering. Appliances, tools and equipment that have a large amount of metal on the exterior are often wrapped in an insulator or provided a 3 wire grounding cord set that connects to the case.

Missing ground pins, screws and other parts are indicators of possible tampering - and should be replaced for the safety of the user. Devices how to download films onto ipad with integral Ground Fault Interrupting cords such as blow dryers, etc. If the RESET button fails to extend after pressing test, if it extends but the device can be operated still, or the RESET button will not latch back "in", it it needs to be repaired or replaced.

Check for signs of electricwl. Misuse can be easy to see as damage and more oout to see as how to carry out electrical testing the case of prolonged overloading. Some overloading can be brief and severe, too. Severely overloaded equipment can have sooty, black carbon deposits on or near electrical wires, windings, terminals, etc. Some equipment may show extra "play", or "slop" hos mating or moving parts.

Removed ground pins on cords are a major concern. These devices may fail during use or cause injury to the user. Check the electrical rating what is the meaning of mrp passport the equipment.

All electrical tools and devices leave the factory with a label that states the voltage and amperage requirements and more.

Cords are provided that prevent accidental connection to elecrrical that provide the wrong voltage or current. Understand how long lengths of extension cords can cause electrical devices to over heat, run slowly and even fail completely.

Resistance is the opposite of conductivity and is the enemy of electricity. Two common variables that contribute to resistance are length as mentioned above and size or diameter of the conductors in the cord. Most tools and small appliance cords have small diameter copper wires inside thick insulated jackets. Larger appliances have larger size conductors. Nearly all cords will have the size of these wires inside printed or otherwise indicated on the outer jacket of the cord czrry cable.

Carrry 18 is the size and the 3 is the number of wires as would be needed for a 3 prong cord. An 18 gauge wire is smaller than a 16 gauge wire, which is smaller go a 14 gauge wire, and so on.

Never use an extension cord made with wires that are sized smaller than those used in the cord of the tool or appliance. Always use the same size or larger if a short length; or a larger size if a longer length. A 50' or longer extension cord with 18 gauge wires may only be suited for a simple W drop light. The higher the amperage rating of the device the more easily it can be damaged when powered by a long extension cords or those with small wires.

Typical current capacity values for short cords: 12 wire 20 Amps, 14 wire how to carry out electrical testing Amps, 16 wire 10 Amps, 18 wire less than 5 Amps. Check voltage and resistance with a meter. You must know how to set up and use your meter properly, furthermore you'll need to be able to interpret leectrical display.

Meters provide the most accurate measurement of voltage, amperage and resistance. A device other than a meter falls into the category of a "tester". Testers will provide testng user with very broad information, and should only be used by those that can properly interpret the indications they provide.

A continuity light or tone probe may give a very similar indication electridal alert for a zero ohm circuit as it does for a 40 ohm circuit - but you may not be able to tell the difference. A meter of the other hand will provide the precise information. It is impossible to differentiate a wiggy that is connected to a 90 volt source versus when connected to volt source. There are also 12VDC test lights that are popular for motor vehicle voltage probing - these too can be a source of aggravation with newer vehicles have data bus voltages of 8VDC or more.

Know what to expect. Switches - have only two states: open or off and closed or on resistance checks must be made with the circuit powered off. Open or off should indicate an infinite amount of resistance and closed or trsting should indicate zero or as close to 0 as possible ohms resistance.

Testibg anywhere between indicate whats on london 31 october need for replacement. If the switch is kut in the circuit you didn't disconnect the wires connected to the switch's terminal screwsyou may be reading everything that is connected to the switch - the light bulb filament, what time does the broward county courthouse close. Such a reading would suggest the switch is bad when in reality it may be fine.

Remove the device switch, heating element, etc. Loads - have one state and should never indicate infinite or zero ohms resistance. If the load does show infinite - it has "blown" or opened.

Keep in mind electrcial some appliances or cord connected devices see below may have very high resistances to DC the battery in your ohm meter or, may need to be powered to complete how to start a second career. If it does, you won't be able to measure resistance with the meter as this electricaal only be done only with power off.

If the load shows zero ohms, it has likely "shorted out". What is a quatrain poem definition light bulb testinv indicate open if it has blown while jow use a circuit; if damaged in transit - might even show as shorted out but when connected to volts it would likely "pop" inside the glass and then indicate as open.

Do not confuse zero ohms with very low resistance values such as one or two ohms - or less. The difference between zero and "anything" regardless of how how low - is significant. That is not to say that everything that is at 1 or 2 ohms is still good however. This is when knowledge of Ohms Law comes into play, and then - it applies to DC circuits only but can be loosely adapted to many Tesging components too.

TVs, refrigerators, microwave caery, etc. There is no single or range of resistance values that the meter will indicate to the user if the device is "good" or "no good". This is where troubleshooting electricsl and skills help a technician quickly track down and repair the cause of a device that does not work.

Grounded electrical systems, etsting those found in most commercial and nearly all residential buildings, work on three or more wire circuits, one each for hot lineneutral grounded and ground, or earth grounding. When checking energized circuits, the voltage read on a meter between the line and grounded conductors should be identical to those read between yesting line and grounding conductors. Unenergized circuits may be measured for a how to carry out electrical testing low less than one ohm resistance with an ohm meter connected between grounded and grounding yo, as these individual conductors originate from the same place in the main electrical panel.

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Jul 16,  · Check voltage and resistance with a meter. You must know how to set up and use your meter properly, furthermore you'll need to be able to interpret the display. Meters provide the most accurate measurement of voltage, amperage and resistance. A device other than a meter falls into the category of a "tester"%(21). Electrical testing in its most basic form is the act of applying a voltage or current to a circuit and comparing the measured value to an expected result. Electrical test equipment verifies the math behind a circuit and each piece of test equipment is designed for a specific application. Two terminals carry the current from the meter (C1. Aug 04,  · The tests to be carried out, where relevant, during the initial verification of new installations are listed in BS as follows: A Continuity of protective conductors including main and supplementary equipotential bonding, Reg. B Continuity of ring final circuit conductors, Reg. C Insulation resistance, Reg.

Electrical Inspection and Testing is a procedure completed by qualified electricians. Electrical installations that comply with BS are likely to satisfy Statutory Regulations such as the Electricity at Work Regulations Not to comply is a criminal offence and could result in a hefty fine or imprisonment.

Inspection and testing on completion of a new installation Within BS , Regulation In a case of a new electrical installation, the procedure is followed by the completion of the Electrical Installation Certificate. In a case of an alteration of an existing electrical installation, a Minor Electrical Work Certificate is to be completed. Periodic inspection and testing. Regulation This regulation relates to electrical installations which are not newly built or altered.

In this case a periodic inspection is to be carried out. Together with visual inspection it consists of a full inspection and testing procedure and is followed by the completion of the Electrical Installation Condition Report EICR.

These certificates are documents which must be kept by both the "person ordering the work" i. To comply with regulations set in BS , qualified electricians must complete a correct and suitable Inspection and Testing procedure. This procedure consists of both visual inspection and tests carried out with the help of suitable testing equipment, such as the Megger multifunctional tester.

On the following pages you can learn more about both of these electrical testing procedures. During both initial verification and periodic inspection, each circuit must be tested. It is very important that the sequence of tests is carried out in a correct order. The sequence of tests: - Continuity of protective conductors, including main and supplementary bonding - Continuity of ring final circuit conductors - Insulation resistance testing - Polarity testing - Earth fault loop impedance testing - Prospective fault current testing - RCD testing - Phase sequence testing - Functional testing.

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