To ensure that the transmission system is operated so that instability, uncontrolled separation, or cascading outages will not occur as a result of the most severe single Contingency and specified multiple Contingencies.
TOP-004-0 was revised by the Missing Measures and Compliance Elements Drafting Team and by the Facility Ratings Standard Drafting Team. The Missing Measures and Compliance Elements Drafting Team added measures and compliance elements but did not change the requirement; the Facility Ratings Standard Drafting Team made changes to the requirements but did not modify the measures or compliance elements. Following BOT adoption of both versions of TOP-004-1 on November 1, 2006, a "conformed" version of the standard was developed to merge the two versions of TOP-004-1 into TOP-004-2.
