This re-issue of SU 1953 dated July 25, 2008 includes an effective date of June 6, 2010. The Third issue is effective until June 6, 2010.
The Fourth issue of SU 1953 dated June 6, 2008 includes the addition of Insulating Covers, the Deletion of superfluous term of "pressure terminal" ahead of connector to make the text less cumbersome to read, the Clarification for 10kA ratings and markings, and Other miscellaneous editorial corrections.