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electrical safety for live measurements

electrical safety for live measurements - Safety...

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Application Note Measuring live voltages and current in today’s high energy environments can result in a severe hazard to equipment and users if proper precautions are not applied. Given the risk of transients, surges, and old- fashioned human error, it always pays to follow safe work practices and use test instruments rated for the voltage or current you’re measuring. Whenever possible, work on de-energized circuits and follow proper lockout, tag-out proce- dures. If you have to work on live circuits, following the steps below will improve your measurement practices and help reduce any hazard. Setup 1. Assess the environment before taking the measurement. 2. Do not work alone in haz- ardous areas. 3. Wear the appropriate Personal Protective Equipment (PPE) as determined by NFPA 70 E and the local recommendations of health and safety personnel. 4. Make sure your test instrument is rated for the measurement environment. 5. Be familiar with and know how to use your equipment prior to any hazardous measurements. Practices 1. Measure at the lowest energy point. 2. Keep your eyes on the area you’re probing and keep both hands free as conditions require. 3. For single phase, connect neutral first — hot second. 4. Use the three point test method discussed below. F r o m t h e F l u k e D i g i t a l L i b r a r y @ w w w . f l u k e . c o m / l i b r a r y Safety considerations for live measurements Keep your eyes on the job at hand 5. Use test probes with a mini- mum amount of exposed metal such as .12 in (4 mm) metal tip probes. 6. Keep one hand in your pocket unless you must use both hands for a good measurement. Setup Environmental analysis Before you open an equipment cabinet, look over your work environment. How do you plan to use your meter? Where will you mount it? Do you have clear access to the equipment in question? Have you been trained on or are you knowledgeable in the use of your meter? Are envi- ronmental hazards present, such as tree branches or water? Do
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