Overvoltage category

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The over­volt­age cat­e­gories de­fined by DIN EN 60664–1/ VDE 0110–1 serve to pro­tect against over­volt­age. The stan­dard pro­vides four cat­e­gories of surge volt­age re­sis­tance for elec­tri­cal equip­ment. The de­vice man­u­fac­tur­ers de­ter­mine how re­sis­tant the elec­tri­cal de­vice is to over­volt­age peaks through the choice of com­po­nents and ca­ble cross-sec­tions as well as the clear­ances and creep­age dis­tances be­tween the com­po­nents, the in­su­la­tion ma­te­ri­als, etc. Over­volt­age cat­e­go­ry I equip­ment can with­stand low over­volt­ages (rat­ed surge volt­age 1,500 volts); cat­e­go­ry IV elec­tri­cal equip­ment, on the oth­er hand, can with­stand high­er surge volt­ages (rat­ed surge volt­age 6,000 volts).

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