Standards and Technical Work
NEMA US 80028 2023 | Gauging and Measuring in ANSI/NEMA C29 Standards
C29 standards regularly reference the use of gauges for measurement with no instructions on how to properly use them. For example, C29.7 and C29.2B both require gauges for use in measuring metal fittings but leave it up to the manufacturer to know how to use the gauge. If the gauges are not used properly, a nonconforming product may pass assessment or, conversely, a conforming product may be rejected. This paper includes a list of different gauges and what they are used for: thread gauge, yoke gauge, ball gauge, GO/NO-GO, socket gauge, and pin gauge. It also recommends a certain level of accuracy for compliance by the insulator parts and components being measured.