Tenants of the Time & Life Building in New York’s Rockefeller Center include Time Inc., publisher of more than 100 magazines. In an effort to “green” the building, shaft grounding rings have been installed to protect the bearings of HVAC fan motors. Proper tuning of a variable frequency drive’s output range and proper grounding of [...]
(No Ratings Yet)
“Where the cow won’t give milk anymore” is a standard lyric in old classic country songs; perhaps you’ve wondered why. Well, back in the early days many strange and downright bizarre occurrences happened on the farm, most of which were thought to be the product of superstition, bad living or old wives’ tales; but that [...]
(6 votes, average: 2.50 out of 5)Both the Canadian Electrical Code (CE Code) Part I and Part III provide requirements for minimum horizontal clearances between high voltage lines and buildings, and vertical clearances between high voltage lines and grade. This article discusses the different approach taken by each. The Canadian Electrical Code, Rule 36-110 makes reference to Table 33, which provides [...]
(No Ratings Yet)The Canadian Electrical Code in some instances limits maximum applied voltages to protect the general public and inexperienced people from electrical shock hazards. Unqualified persons are at greater risk due to their inability to identify electrical hazards and understand electrical shock risks. This article reviews some of the circumstances where the code prescribes maximum voltages [...]
(No Ratings Yet)
There have been numerous inquiries to my office about the requirement of increased clearances for combustible sleeving and electrode boots from conductive and combustible materials, (which equates to everything) when used with high voltage GTO cables and terminations. The growing necessity to increase the clearance requirements has brought changes to Section 34 (high voltage sign [...]
(No Ratings Yet)There are hundreds of customers in my company’s service area who own their own high voltage transmission, distribution and/or substation electric supply facilities. The service voltages for these customers range from 4 kV to 138 kV. Many years ago, I investigated an accident involving the death of a farmer on one such facility. The farmer [...]
(No Ratings Yet)
The March/April issue of the IAEI News had an article on high voltage Equipment that discussed the new areas of application. The article discussed how these systems have evolved into some non-traditional areas along with some of the safety concerns for those working around this equipment. Codes and standards were discussed in general along with [...]
(No Ratings Yet)
An inspector’s first look at the service shown above seems to show a relatively simple 120/240-volt single-phase service. It seems to include a service entrance riser, a service entrance wireway, and four 200-ampere fused disconnects, fused at 150 amperes. Disconnects are marked “Suitable for Use as Service Equipment.” Each disconnect has a tap to the [...]
(No Ratings Yet)
Most people in the non-utility side of the electrical industry are very familiar with the design, installation and inspection of electrical systems rated 600 volts or less; primarily because these systems are numerous, and these people work with them daily. The one exception is the sign industry where higher voltages are used primarily for neon [...]
(No Ratings Yet)There are two sets of rules for work in proximity of overhead high voltage lines: The rules for qualified persons and the rules for unqualified persons. There is no gray area. Occupational Safety and Health Administration (OSHA) regulation 29CFR1910.269(x) defines a qualified person as “one knowledgeable in the construction and operation of the electric power [...]
(No Ratings Yet)
IAEI, as the keystone of the electrical industry, is a membership driven, non-profit association promoting electrical safety throughout the industry by providing premier education, certification of inspectors, advocacy, partnerships and expert leadership in Electrical Codes and Standards development.
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