All Other Equipment. Conservative weighted averages of daily maximum ambient temperatures (Column 1 of Tables A2 and A3) should be used for determining ratings of all other line terminal equipment. Therefore, the average of August daily maximums should be used for summer ratings and the average of November daily maximums should be used for winter ratings. Inspection of the August and November values in Column 1 of Tables A2 and A3 indicate that the New England temperatures are slightly lower than those of the Hartford area, being less than 2ºC lower in summer and less than 1ºC lower in winter. After considering the data of Tables A2 and A3, the SDTF has determined that the longstanding ambient temperature recommendations of Table A1 should remain unchanged. WIND VELOCITIES A wind velocity of 3 fps should be assumed during both the winter and summer periods where applicable. These values were determined by the Conductor Rating Working Group of the System Design Task Force and accepted by NEPOOL and are documented in the report ”An Analysis of Wind-Temperature Data and Their Effect on Current-Carrying Capacity of Overhead Conductors” [Reference 4].
