![]() The RCDT330 additionally offers the facility to save test results to internal memory. The large liquid crystal display for test results is backlit in this model, making it easier to use in locations with low ambient light levels. The operating current range of the RCDT320 is extended to cover 10mA to 1,000mA devices, and the ability to measure AC supply voltage and frequency is added. It incorporates ramp testing testing, for RCD tripping current measurement, and the unique Megger auto sequence test feature, which saves time by allowing the tester to conduct all the RCD tests, and to store the results while the operator stands by the RCD, resetting it as appropriate. The mid-range RCDT320 covers a wider supply voltage range of 50V to 290V, allowing use with centre-tapped 110V supplies. When connected to a live supply, it defaults to voltmeter mode. ![]() It also has facilities for testing standard and selective RCDs, and covers current ranges from 30mA to 500mA. The low-cost entry-level RCDT310 model is suitable for use on supplies between 100V and 280V, and offers 0.5I, I and 5I tests, with provision for tests starting at 0ْ/180ْ of the supply waveform, as well as for DC tests. All models in the range are water and dust resistant, with an IP54 ingress protection rating. Introduced after extensive customer research into the requirements of electrical contractors, these innovative instruments combine rugged construction with straightforward operation, and they are offered at very competitive prices.Īvailable in three models, ensuring that all users can choose a model which exactly meets their needs, RCDT300 RCD testers feature a compact ergonomic design, making them easy to handle and use, and a tough impact-resistant body with a rubber overmoulding for additional protection, plus a built-in display cover. ![]() Tough rubber armoured case with built-in coverĮven if they are inadvertently connected to a live three-phase supply, RCD testers in Megger's RCDT300 range remain undamaged, and present no safety hazard to the user.Enables testing on 110 V centre tapped supplies.Similarly, if multiple circuits cause the RCD to trip, this could be a sign of a neutral fault and should also be thoroughly investigated to determine the cause. However, if a particular circuit trips the RCD again with no clear cause, it is recommended to leave that circuit switched off until further investigation can be carried out. If the cause is simple, like a blown bulb, for example, this should be easy to rectify. The device can then be reset, and you can turn the circuits back on to try and identify the cause of the trip. If an RCD trips, you should switch off all circuits which are protected by the tripped RCD. A faulty appliance plugged into the socket circuit.Weather conditions including heavy rain or lightning.Presence of moisture in the circuit or appliance.Incorrect RCD current rating (it is important to check for the correct current rating).The presence of old, faulty, or damaged electrical wiring.There are several reasons why an RCD might trip.
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