Ratings Using Multiplying Factors. The methodology identified in this section is based on information provided by leading manufacturers of Line Traps and is documented in the Report of the Ad Hoc Line Trap Rating Procedure Working Group of the System Design Task Force [Reference 1]. Table I 1 Loadability Multipliers to be Applied to Nameplate Rating Ratings Winter Summer Normal 1.13 1.05 Emergency – 12 Hours - 1.21 Emergency – 4 Hours 1.30 - Emergency – 15 Minutes 1.69 1.58 D.A.L. 1.86 1.73 Where, The Line Traps meet the design requirements of ANSI Standard C93.3-1995. The maximum winter ambient is 10C, and the maximum summer ambient is 28°C. The Line Trap is designed for a hottest spot temperature rise of 110C over a 40C ambient.4 (Insulation Temperature Index of 130) Normal ratings are determined by using the methods introduced in Section 3.2 above Emergency ratings are found by applying the multiplying factors of Table I2 below to the Normal ratings Table I 2 Multipliers to be Applied to Normal rating to Determine Emergency Ratings Duration of Emergency Multiplying Factor 4-48 Hours 1.15 15 Minutes 1.50 D.A.L. 1.65
