IDEC SG4 Type 4 Finger & Hand - Manual (Page 66)

SG4-B Series Instruction Manual
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TYPE (OF ESPE): the Electrosensitive Protective Equipment (ESPE)
have different reactions in case of faults or under different
environmental conditions. The classification and definition of the "type"
(ex. type 2, type 4, according to IEC 61496-1) defines the minimum
requirements needed for ESPE design, manufacturing and testing.
WORKING POINT: machine position where the material or
semifinished product is worked.