LPS 1175 is a Loss Prevention Certification Board standard covering physical security products and consists of a number of security ratings with test requirements of increasing intensity. These relate to the tools used for attack, the amount of time the attacker has available and the level of noise created during the attack.
Details of the LPS1175 ratings and attack tools can be found in the standard which can be downloaded here: http://www.redbooklive.com/download/pdf/LPS1175.pdf
SR2 tests replicate a determined opportunist attack using hand tools.
SR3 tests simulate a pre-meditated forced entry using tools specifically chosen for the purposes of breaking and entering, including battery operated power tools.