Working with electricity can be dangerous or even lethal. Knowing what is hot and what is not differentiates a safe worker from a risk taker who doesn't bother to find out ahead of time. Electricians in the field should have proper test instruments on hand all the time and know when and how to use each testing tool. When not using appropriately rated meters, the electrician always faces the danger of getting injured. Meter products are covered by International Electrotechnical Commission ( IEC) standards and many are Underwriters Laboratories ( UL) stamped. The UL, itself, follows the IEC standards, which are designed to protect users from unknown voltage and accidental misuse. The standards for meters for CAT I (electronic and low energy equipment CAT II (appliances, PCs, TVs and all outlets more than 30 feet from a Cat III source and CAT III (motor control panels, including feeders and short branch circuits, distribution panel devices, and heavy appliance outlets) are already in place. Most of today's meters are safer than yesteryear's meters. So, even if you don't need more meters, perhaps you should update to safer ones. Even the meter casings, today, are far more fire retardant than dated ones. Once CAT IV standards are approved, they will become the standards at the primary supply level, for measuring outdoor equipment and service entrance equipment, and will cover exterior transformers and meters, such as service drops from pole to building, overhead lines to detached buildings, and underground lines to well pump. What to look for when buying test equipment You can get many more features, and therefore greater job efficiency, in the same size product at a lower price than in the past. Many new meters are digital; some combine digital with analog on the same screen. The increasingly popular digital meter-minus a moving needle that can break-is more rugged and.
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