State system for ensuring the uniformity of measurements. Permeation tubes for Sulfur Dioxide, Hydrogen Sulfide, Nitrogen Dioxide, Chlorine, Hydrogen Chloride, Ammonia. Verification method
Residual current operated circuit-breakers without integral overcurrent protection for house and similar uses (RCCB`s). Part 2-1. Applicability of the general rules to RCCB`s functionally independent of line voltage
