English to Russian Tech/Engineering Electronics / Elect Eng

Equipment in an industrial environment, directly connected to major feeders/short branch circuits, is subjected to Installation Category III.
If this is the case, a reduction to Installation Category II is required.
This can be achieved by use of an insulating transformer with an earthed screen between primary and secondary, or by fitting listed Surge Protective Devices (SPDs) from live to neutral and from neutral to earth.
Listed SPDs shall be designed for repeated limiting of transient voltage surges, suitable rated for operating voltage and designated as follows:
Type 2 (Permanently connected SPDs intended for installation on the load side of the service equipment overcurrent device); Nominal Discharge Current (In) 20kA min. For example:
FERRAZ SHAWMUT, STT2240SPG-CN, STT2BL240SPG-CN rated 120/240Vac, (In=20kA).
Maximum distance between installation and reduction is 5m.