Since at least 1940, the National Electrical Code has contained a requirement for ampacity correction of installations subject to high temperature conditions. In the 2005 NEC, a new fine print note was added to inform code users that if conductors in conduit were exposed to direct sunlight in close proximity to rooftops, they might experience [...]
(3 votes, average: 3.67 out of 5)
Most electrical inspectors are aware that confusion about wire temperature ratings and equipment termination temperature requirements will likely result in a rejected installation. Information about this topic can be found in the National Electrical Code (NEC), testing agency directories, product testing standards and manufacturers’ literature, but many electrical system installers and designers typically do not [...]
(3 votes, average: 5.00 out of 5)
New requirements for ampacity correction factors for conductors installed in conduits on rooftops were introduced in the 2008 NEC at Section 310.15(B)(2)(c). This new requirement for ampacity correction due to ambient temperature resulted from extensive study and fact-finding efforts that collected data which demonstrated valid concerns about excessive heat exposure for conductors and cables installed [...]
(1 votes, average: 1.00 out of 5)
Abstract The interiors of conduits in sunlight, such as those containing conductors feeding air conditioning units on rooftops, become significantly hotter than the outside air (which is always measured in the shade). Data show that these temperature differentials can easily reach 70°F, even when the conductors are electrically unloaded. Remarkably, the differentials were found to [...]
(No Ratings Yet)
The attack on the World Trade Center (WTC) in New York City has raised concerns among Americans regarding the fire safety of high-rise structures. Until September 11, 2001, few people envisioned the total collapse of a high-rise building except under controlled conditions such as an implosion for demolition purposes. Today, the public’s concerns are heightened.
(No Ratings Yet)
Many electrical inspectors can tell you that confusion about wire temperature ratings and equipment termination temperature requirements results in their rejecting installations. Information about this topic can be found in the National Electrical Code (NEC), testing agency directories, product testing standards, and manufacturers’ literature, but many people do not consult these sources until it is [...]
(2 votes, average: 4.50 out of 5)
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.
Bad Behavior has blocked 2663 access attempts in the last 7 days.