Physical installation To clamp a MAC Aura XB to a truss. Check that the rigging structure can support at least 10 times the weight of all fixtures and equipment to be installed on it. Obtain a rigging clamp such as the G-clamp, Half-coupler clamp or Quick trigger clamp available as accessories from Martin (see Accessories on page 35). An omega bracket is not required. Check that the rigging clamp is undamaged and can bear at least 10 times the weight of the fixture. Fasten the clamp to the fixture with a minimum grade 8.8 steel M bolt in the threaded hole in the center of the base of the fixture. The bolt must protrude 20 - 30 mm (0.8 - 1.2 ins) into the base of the fixture. Block access under the work area. Working from a stable platform, hang the fixture on the truss with the arrow on the base towards the area to be illuminated. Tighten the rigging clamp. Secure the fixture against clamp failure with a secondary attachment such as an approved safety cable that is rated for the weight of the fixture and all attached accessories and hardware using one of the attachment points at the edges of the base (see Fixture overview on page 7). Do not use any other part of the fixture as a safety cable attachment point. Check that the head will not collide with other fixtures or objects.