![]() The 700VAC range is the appropriate setting to measure 240V, as it is the closest higher range. On multimeters, AC voltage is represented by “VAC” or “V~” and you also see two ranges in that section. Your home uses AC voltage, so this is what we set the multimeter to. There are two types of voltage DC voltage and AC voltage. To measure voltage, you plug the black negative multimeter probe in the port labeled “COM” or “-”, and plug the red positive probe in the port labeled “VΩmA” or “+”. You have a semi-circle, a long vertical slot, and a short vertical slot.Ĭomparing these will help you visually determine whether the outlet works with 240 volts or not. On the other hand, while testing 120V, you usually have three slots that are not identical. This is a ground connection to safeguard you from electrical shocks. Sometimes, the 240V configuration comes with a fourth slot shaped in a semi-circle. The two identical slots supply 120 volts each, with this adding up to 240V, while the third slot holds neutral wiring. One way to physically identify an outlet is to check if its associated circuit breaker is double-pole, as this is used within 240V systems.Īnother way is to check its external features.Ī 240-volt plug is usually bigger than a 120V outlet and generally features three slots two vertical slots that are of the same size and a third slot in the shape of an “L”. Regardless, this isn’t wholly reliable in knowing if an outlet is truly 120V or 240V. Most of the time, these are usually specified within manuals or country-wide blueprints of electrical systems.įor instance, the United States uses 120V as a standard for most appliances, with only large appliances like air conditioners and washing machines requiring high 240V current. Once all the safety measures have been carried out, you proceed to the next step.įor your diagnosis to be accurate, you want to make sure that you are testing an actual 240V electrical component. One additional measure is to hold both multimeter probes in one hand to prevent electricity from flowing through your whole body, just in case. Generally, you wear rubber insulated gloves, put on safety goggles, and ensure that the multimeter leads don’t come in contact with each other during the test. ![]() The first step you always have to take before testing a hot electrical wire or component is to safeguard yourself from fatal electric shocks. There is a lot more to know about testing 240 volts with the multimeter and we will get right into them. If the outlet provides 240 volts of current, the multimeter is also expected to show a 240V reading. Identify the outlet you wish to test, set your multimeter to the 600 AC voltage range, and place your multimeter probes into each of the two identical openings on the outlet. How To Check 240 Voltage With A Multimeter Tips On Replacing 240V Electrical Component.How To Check 240 Voltage With A Multimeter.
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