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Class 1 ceramic capacitors have an insulation resistance of at least 10 GΩ, while class 2 capacitors have at least 4 GΩ or a self-discharge constant of at least 100 s. Plastic film capacitors typically have an insulation resistance of 6 to 12 GΩ.
Impact insulation class (or IIC) is an integer-number rating of how well a building floor attenuates impact sounds, such as footsteps. A larger number means more attenuation. A larger number means more attenuation.
Oil Well Pump Motors – Severe Duty Motors – Pool Pump Motors – One of the quietest motor pump on the market, due to its permanent magnet motor and TEFC design; Compare to the ODP (Open Drip Proof) motor design, which has ventilation openings which are guarded to prevent falling water from entering the motor windings.
Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations.
In larger ratings, oil circuit breakers rely upon vaporization of some of the oil to blast a jet of oil through the arc. [ 5 ] Gas (usually sulfur hexafluoride ) circuit breakers sometimes stretch the arc using a magnetic field, and then rely upon the dielectric strength of the sulfur hexafluoride (SF 6 ) to quench the stretched arc.
High voltage is defined as any voltage over 1000 volts. [3] Those of 2 to 33 kV are usually called medium voltage cables, those over 50 kV high voltage cables.. Modern HV cables have a simple design consisting of a few parts: the conductor, the conductor shield, the insulation, the insulation shield, the metallic shield, and the jacket.
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