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Let’s say, you are undertaking design and installation or inspection of such electrical installation in patient care areas of a health care facility. Do you consider certain parts of patient care areas as wet locations, and which criteria do you use for such consideration? In light of these questions — which wiring methods should be used, and which types of equipment construction should be specified in design? Is use of a solidly grounded system allowed in patient care areas or must only isolated systems be used?
During an evaluation of equipment at a hair treatment doctor’s office, we found a patient device for treating hair loss with the use of lasers. With this piece of equipment, the patient sits in a chair, and the laser “hat” sits slightly above the head. To prepare for the procedure, the top of the patient’s [...]
The topic of grounding and bonding as it relates to the National Electrical Code (NEC) and proper installations still seems to be a mystery to many electricians, engineers and inspectors. In the author’s travels around the U. S. and Canada, this seems especially true as it relates to services, separately derived systems, and when another [...]
You’re on the operating table, the surgery is almost over. The procedure has gone well. The doctors and nurses are walking in liquid on the floor covered with antiseptic, your blood, and other fluids. As your doctor is making the final repairs, a nurse is at the computer typing in some data; then she turns [...]
Cancer is one of the leading causes of death in the United States. It is expected that about 1.4 million new cases of cancer will be diagnosed in 2007, according to the American Cancer Society’s Cancer Facts and Figures 2007.1 Due to advances in medical technology, however, trends in five-year relative survival have improved greatly [...]
Grounded Systems Generally Required Generally, electrical systems used in power distribution systems for premises wiring are required to be grounded. The NEC includes rules that often make this determination. Some electrical systems are required to be grounded, while other systems are permitted to operate ungrounded (see 250.20 and 250.21). Then there are those systems that [...]
Which areas of a health care facility electrical system must be tested for voltage difference between ground points, for ground return path voltage rise — in grounded systems or for test of impedance to ground — in isolated systems? Which loads of an electrical system in a health care facility are considered to be essential [...]
What Is a VFD? A variable frequency drive (VFD) is an electrical device we use to control the speed of a standard three-phase ac induction motor. The number of poles designed into a motor and the frequency applied to the motor determine the motor base speed. We can conveniently adjust the speed of a motor [...]
Health care facilities are an integral part of our lives. We regularly visit them ourselves and take our loved ones to them for care. We assume that we are taking them for help and improvement, and that the technology being used will not cause harm. We think of electrical power as something that exists for [...]
Generally, electrical systems used in power distribution systems for premises wiring are required to be grounded. The NEC includes rules that often make this determination. Some electrical systems are required to be grounded, while other systems are permitted to operate ungrounded (see 250.20 and 250.21). Then there are those systems that are not permitted to [...]
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