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Porter-Cable was founded in 1906 in Syracuse, New York, by R.E. Porter, G.G. Porter, and F.E. Cable, who invested $2,300 in a jobbing machine and tool shop the trio ran out of a garage. In 1914, the company began to focus on power tools, starting with a line of lathes .
Real-time ratings allow control room engineers to adjust power flows according to normal operational events or contingencies. They are based on "steady-state (equilibrium) ampacity" calculations. Emergency ratings are based on transient equations and models: they provide permissible overload ratings for a short and adjustable time (typically 5 ...
The contacts of the pressure switch may be rated a few tenths of an ampere to around 15 amperes, with smaller ratings found on more sensitive switches. Often a pressure switch will operate a relay or other control device, but some types can directly control small electric motors or other loads.
In electrical engineering, a dielectric withstand test (also pressure test, high potential test, hipot test, or insulation test) is an electrical safety test performed on a component or product to determine the effectiveness of its insulation. The test may be between mutually insulated sections of a part, or energized parts and ground.
Centrifugal governors were invented by Christiaan Huygens and used to regulate the distance and pressure between millstones in windmills in the 17th century. [4] [5] James Watt designed his first governor in 1788 following a suggestion from his business partner Matthew Boulton.
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