electrical systems
CCEI USA (Inglewood, CA) manufactures 12-14 volt Safety AC Transformer designed specifically to power pool…
A little more than 100 years ago, in the first big growth spurt in the use of electricity, the harsh realities of the hazards involved with it quickly became apparent. Fires were common occurrences everywhere electricity was distributed, and serious (and often fatal) accidents made daily headlines wherever people came into contact with this wondrous phenomenon. Virtually all of the electric works being built in those early days were set up to provide lighting for a population tired of living in the gloom of candles, gas lamps and coal-oil lanterns. That meant that
There is no doubt about it - during the later years of the 19th Century, Thomas Edison was "Mr. Electric" in this country, and the electricity he promoted was direct current (DC). Last month, we took a look at the shortcomings of his DC system versus the alternating current (AC) distribution system that now serves us all so well. Now let's take a look at the personalities involved. In 1876, using
In the spring of 1941, my mom and dad, my sister and I moved into our brand-new house on Ardmore Avenue in one of northwest Detroit's real estate developments. It was a thoroughly modern house, with all of the latest high-tech features - the garage door moved upward to open, instead of swinging left and right like barn doors, and the furnace in the basement was operated by natural gas, eliminating forever the need to shovel coal. The house cost $5,550. From an electrical standpoint, the house was up to the codes and standards of its day - albeit a far cry from what is required today. The wiring was a two-wire system with no ground. All of the receptacles had two equal-size slots, and that was just fine because anything we wished to plug into these receptacles had a two-pronged plug at the end of its cord. A fuse panel in a bedroom closet contained four 15-amp fuses. That was it: four fuses to
Last month we covered the "hows" of grounding pretty well. Using the definitions from the National Electrical Code (NEC) for guidance, we saw that in order to be considered effectively grounded, the non-current-carrying metal parts of all equipment associated with a watershape must be connected to the system grounding bus at the electrical service panel. This is accomplished by installing a green-colored (or green with a yellow stripe), minimum No. 12 AWG insulated copper conductor between the equipment's grounding terminal and the system grounding bus. This conductor is
