Sep 30, 2004 · Two Notes: (1) Hilti KB-TZ2 may be directly substituted for TZ in this detail. (2) In the event that SDC C applies and the enclosure (s) in question is “unimportant (i.e., Ip = 1.0 per ASCE 7),” then the enclosure (s) is seismically exempt (per ASCE 7 para. 13.1.4) and only gravity loads need be considered.