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But every company should have an official lockout/tagout procedure, which should always be 46 followed when electrical circuits are de-energized during construction or maintenance work. ” 47 This page intentionally left blank CHAPTER 4 Troubleshooting Dry-Type Transformers D ry-type transformers are a part of most electrical installations. They range in size from small doorbell transformers to three-phase 25-kVA units installed in electrical closets (Figure 4-1) to large, free-standing units rated at several hundred kVA (Figure 4-2).
The inputs marked V and A are normally colored red, as are the various test leads that plug into them. The common input, which is used for all measurement functions, is normally colored black, as is the common test lead that plugs into it. 28 NOTE: Some units also have a fourth separate input for current measurements in the milliampere (mA) or microampere (µA) range. Accessories DMM manufacturers offer a wide array of accessories that both extend measurement ranges and allow the instrument to be used for additional types of measurements, including: ● ● ● ● ● ● ● ● ● Power Power factor Energy (kWh) Harmonics Temperature (single probe, and dual probe for differential) Light intensity Relative humidity Carbon monoxide (CO) Airflow General Instructions for Using Digital Multimeters Because exact capabilities and features of different DMMs vary, it is important to read the manufacturer’s manual supplied with the unit.