The dc instrument shunts within this standard apply to shunts for use in direct current circuits to extend the current measuring range of devices (e.g. instruments, meters, protective relays, or low-voltage trip systems). The design and test principles within this standard may be applied with suitable exceptions for shunts constructed for special requirements; for example, those having unusually high or low current ratings or voltage drops, special or unusual ranges, and nonstandard terminal arrangements for special applications.

This standard provides requirements for shunts used for measuring current in direct current circuits. This standard does not apply to the following: a) Shunts for special military applications b) Internal shunts used as a part of a self contained ammeter c) Shunts for use as standards for calibration of measurement systems d) General purpose shunts of lower accuracy than specified, to be used where required indications are only approximate

The purpose of this document is to: a) Establish minimum functional requirements b) Provide preferred ratings c) Provide application recommendations