3, crust defends of grade choose involve person safety and equipment to move reliably directly, answer to use an occasion according to electric machinery, prevent component of danger of interior of electric machinery of human body bring into contact with, prevent solid eyewinker to enter housing inside, prevent water to enter ill effect is caused to electric machinery inside housing.
Electric machinery crust defends grade adds 2 character block to become by alphabetical IP, number of the first feature expresses to prevent solid, number of the 2nd feature expresses to prevent a liquid.
Be like IP44: Number of the first feature is to express to defend the electric machinery of 1mm solid, the lead that can prevent diameter or ply to be more than 1mm or straight can touch or be close to housing inside electrified or rotational component.
Number of the 2nd feature is to express to prevent splash water, electric function bears of any direction splash water to should not have ill effect.
Be like IP23 again: Number of the first feature is to express to defend be more than 12mm solid to enter electric machinery, can prevent finger or be close to housing inside electrified or rotational component, the solid eyewinker that can prevent to be more than 12mm enters housing inside.
Number of the 2nd feature is to represent opportunity of water and electricity of protected against dropping water, become the drop water inside 60° role range to should not have ill effect with perpendicular namely.
Above feature number expresses to defend grade is jumped over namely greatly more tall, can consult GB/T 4942.1 " electric machinery crust defends classification " standard.
4, should ask to choose appropriate electric machinery to install type by the installation of equipment of form a complete set, installation type uses code name “IM” to be united for international tag a form. Install ” to be B by horizontal of uppercase delegate “ again or be V on behalf of vertical installation, along with 1 or 2 arabic numeralses show structural characteristic and type type. General horizontal installs electric machinery to be IMB3, namely 2 end lid, organic bottom, leg, the axis extends installation to be on fundamental component. Additional, electric machinery of general vertical installation carries a lid 2 times namely for IMV1, abysmal foot, axis is extended downward, end takes flange, flange to have via on the lid, protruding resembles be being carried in the drive of electric machinery, borrow flange to be installed in bottom, other installation structure can consult GB/T 997 " electric machinery structure and installation type code name " standard.
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