Martin MAC One - Securing Fixtures with Safety Cables

Martin
®
MAC One Safety and Installation Manual Rev. B 11
Mounting directly on a truss with two rigging clamps
The fixture can be clamped to a truss or similar rigging structure in any orientation
using two half-coupler type rigging clamps (see illustration on right) bolted directly
to the fixture base.
To clamp the fixture to a truss directly with half-coupler clamps:
1. Check that the rigging structure can support at least six times (or more if
required by local regulations) the weight of all fixtures and equipment to be
installed on it.
2. Block access under the work area.
3. Bolt two half-coupler clamps securely to the base of the fixture by passing an
M12 grade 8.8 steel minimum bolt through each clamp and fastening the bolts
into the threaded holes C in the illustration above. Bolts must protrude minimum 24 mm and maximum
40 mm into the base of the fixture (see illustration on right). Apply a small quantity of Loctite 243 to the
threads of the bolts before fastening them into the base. The clamps must be in perfect condition and
approved for the weight that they will support. Do not use one single clamp, or you will damage the
fixture base and create a safety hazard.
4. Fasten the two half-coupler clamps securely to a rigging truss or
similar.
5. Secure the fixture with a safety cable as directed below.
Securing with a safety cable
1. Obtain a safety cable that is approved for the weight of the fixture.
2. Fasten the cable to one of the safety cable attachment points in
the base of the fixture (see B in illustration above) by either
looping it through or fastening a carabiner clip to the attachment
point B.
3. Remove as much slack as possible from the safety cable (by looping the cable around the truss chord,
for example) and fasten it to a secure anchoring point.
4. Make sure that the safety cable will hold the fixture if a primary attachment fails.
5. Make sure that there is no possibility of the head colliding with other fixtures or objects when it moves
through its full pan and tilt ranges,
B
B
A
A
C
C
C
106 mm
MAC One fixture base
Half-coupler
clamp