{"id":6629,"date":"2026-09-17T10:45:53","date_gmt":"2026-09-17T10:45:53","guid":{"rendered":"https:\/\/www.qeeingenieria.com\/?p=6629"},"modified":"2026-10-05T03:46:12","modified_gmt":"2026-10-05T03:46:12","slug":"electrical-measurements","status":"publish","type":"post","link":"https:\/\/www.qeeingenieria.com\/en\/electrical-certificate\/electrical-measurements\/","title":{"rendered":"Do You Need Electrical Measurements?"},"content":{"rendered":"\t\t
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If you want to assess the actual condition of an electrical installation, a simple visual inspection is not enough<\/b>. It would be like trying to determine a person’s health just by looking at them: medical tests and examinations are usually required to obtain a reliable diagnosis<\/b>. The same principle applies to electrical systems.<\/p>

To properly evaluate an electrical installation, it is essential to use electrical measuring instruments<\/b>. These devices allow us to determine key parameters that cannot be detected visually, such as insulation resistance, continuity, grounding quality, protective devices performance, and hidden safety risks<\/b>.<\/p>

Furthermore, the electrical installation is one of the most hazardous elements<\/b> in most homes and buildings if it is not in good condition. An electrical fault can lead to electric shocks, fires, or serious damage<\/b> to people and equipment.<\/p>

For this reason, when we carry out a complete electrical renovation<\/b>, we do not simply install new wiring and electrical panels. Once the work is completed, we thoroughly test the installation<\/b> using professional measuring equipment to ensure everything operates correctly and complies with current regulations<\/b>.<\/p>

Likewise, we are often contacted to legalize electrical installations<\/b> that were not originally carried out by our company. In these cases, before issuing Electrical Installation Certificates (CIE)<\/b><\/a> or preparing electrical engineering projects, we perform the necessary tests using professional instruments to verify that the installation is safe and meets all applicable technical requirements<\/b>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What Are Electrical Measurements? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Electrical measurements are processes used to determine the value of an electrical parameter<\/b> by means of appropriate measuring instruments.<\/p>

For example, measuring the voltage of a cable in an electrical system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Instruments and Equipment for Electrical Measurements<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There is a wide range of measuring instruments available<\/b>, including voltmeters, multimeters, clamp meters, lux meters, earth resistance testers, calipers, and many others.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Are All Measuring Instruments Suitable? <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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No, not all electrical measuring instruments are suitable for every task<\/b>. The choice of equipment depends on the type of measurement required<\/b> and the project for which the measurement results are needed.<\/p>

For example, when performing electrical certifications<\/b>, it is essential to use certified measuring instruments that comply with the European Standard UNE-EN 61557<\/b>. This standard regulates measuring equipment used in electrical installations, particularly devices intended to verify safety parameters such as insulation resistance, earth resistance, and other critical measurements<\/b> necessary to ensure proper operation and safety.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Electrical Measurements with a Multimeter: The Most Common Instrument \n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Multimeters are among the most versatile and widely used<\/b> electrical measuring instruments. A wide variety of models is available on the market, offering different features and price ranges.<\/p>

If a multimeter is certified according to UNE standards<\/b>, its price generally exceeds \u20ac500<\/b>, as it meets the requirements for professional measurements and electrical certifications<\/b>. On the other hand, basic or non-certified multimeters can be purchased for less than \u20ac100<\/b>, although they are not suitable for official measurements<\/b> or certification purposes.<\/p>

View product on Amazon<\/a><\/p>

Below are some of the measurements that can be carried out with a multimeter:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Voltage <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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With power?<\/strong><\/td>\nYes. If there is a light fixture connected, it should be switched on.<\/strong><\/td>\n<\/tr>\n<\/thead>\n
How is the measurement performed?<\/b><\/span><\/td>\nMeasure between phase and neutral, or between phase and phase in three-phase systems (never phase and earth).<\/span><\/td>\n<\/tr>\n
Values<\/b><\/span><\/td>\n\n

Symbol:<\/b> V<\/p>\n\n

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Single-phase:<\/b> 230 V (phase to neutral)<\/p>\n\n

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Three-phase:<\/b> 400 V (phase to phase)<\/p>\n\n

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Phase to earth:<\/b> 230 V<\/p>\n\n

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Neutral to earth:<\/b> 0 V<\/p>\n<\/td>\n<\/tr>\n

What is it used for?<\/b><\/span><\/td>\nTo verify that power is reaching the circuit correctly, identify phase and neutral conductors, and determine whether the installation is single-phase or three-phase.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Insulation Resistance <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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With power?<\/strong><\/td>No power<\/strong><\/td><\/tr><\/thead>
How is the measurement performed?<\/b><\/span><\/td>The tester is connected at both ends of the electrical circuit to verify that continuity exists from the starting point to the endpoint. A positive result produces an audible beep.<\/span><\/td><\/tr>
What is it used for?<\/b><\/span><\/td>To identify cables and detect interruptions, faults, leaks, or poor connections that prevent current flow.<\/span><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Continuity Test (Audible Beep) <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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With power?<\/strong><\/td>No power. Care must be taken with equipment connected to outlets, as it may be damaged. All devices should be unplugged before testing. It is generally safer to perform the test with the earth conductor connected to reduce the risk of damage.<\/strong><\/td><\/tr>
How is the measurement performed?<\/strong><\/td>Measure between conductors that are not connected together:
  • Earth to Neutral<\/li>
  • Earth to L1<\/li>
  • Earth to L2<\/li>
  • Earth to L3<\/li>
  • Between phases<\/li>
  • (NOT between Phase and Neutral)<\/li><\/ul><\/td><\/tr>
Values<\/strong><\/td>Megohms (M\u03a9)

Greater than 999 M\u03a9 or above 500 M\u03a9: Excellent

Less than 5 M\u03a9: Serious issue<\/td><\/tr>
What is it used for?<\/strong><\/td>To assess the quality of the cable insulation.<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Loop Impedance (Earth Fault Loop Impedance) <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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With power?<\/strong><\/td>Yes.<\/strong><\/td><\/tr><\/thead>
How is the measurement performed?<\/b><\/span><\/td>

Phase + Earth.<\/p>

It is recommended to carry out the measurement at the furthest socket outlet.<\/p><\/td><\/tr>

Values<\/b><\/span><\/td>Ideally below 20 \u03a9.<\/span><\/td><\/tr>
What is it used for?<\/b><\/span><\/td>To evaluate the effectiveness of the earthing system.<\/span><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Would You Like to Rent a Multimeter in Alicante? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Clamp Meter (Ammeter) \n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The ammeter, commonly known as a clamp meter<\/b>, is an electrical measuring instrument designed with a clamp-shaped sensor that allows measurements without disconnecting the circuit<\/b>.<\/p>

The device measures current under load, meaning while the installation is operating<\/b>:<\/p>