a complementary bracket 191 or 192 on an adjacent purlin or beam in a variation of this embodiment member 90 may extend from the ledger bracket 191 192 to a corner bracket 193 that is mounted at the junction of a beam or purlin in the illustrated embodiment another bracket 191 or 192 is provided on the other side of the purlin or beam and a second member 90 extends away from the opposite bracket this member 90 may terminate at another of brackets 191 192 or at a corner bracket 193 as illustrated it is to be appreciated that different combinations of brackets 191 192 and or corner brackets 193 may be used with elongated brackets 90 of different lengths depending on the positions selected for brackets 191 192 and or 193 it is to be appreciated that these embodiments may also incorporate other embodiments of the invention such as without limitation brackets 133 and or 134 these embodiments install completely above the ceiling line of the purlin which means they should completely clear any ceiling mounted obstructions the embodiment depicted in fig2 22 should be installed close to or onto the bottom of the roof joists so as to be clear of any roof mounted equipment or fire sprinkler system anchored to the bottom of the ledger or purlin in the embodiment of fig1 the angled bracket 63 may be replaced by a square bracket 64 such as for example when a pt cable is required at 8 foot intervals or at every purlin most embodiments of these inventions are symmetrical such that identical or mirror image components may be.