This Guide presents a practical approach to the application of uncertainty of measurement to
conformity assessment activities in the electrotechnical sector . It is specifically conceived for
use in IECEE Schemes as well as by testing laboratories engaged in testing electrical
products to national safety standards. Clause 4 describes the application of uncertainty of
measurements principles. Clause 5 provides guidance on making uncertainty of measurement
calculations. Annex A gives some examples relating to uncertainty of measurement
calculations for product conformity assessment testing.