Sep 30, 2004 · Two Notes: (1) Hilti KB-TZ2 may be directly substituted for TZ in this detail.(2) If the exterior, on-grade transformer is “unimportant (i.e., Ip = 1.0 per ASCE 7)” and being installed as part of a new- or existing-building project in which the seismic design of the building is based on SDC C, compliance with the slab/anchorage shown on Std