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I* I
RECOMMENDED
GUIDELINES
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4.28
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.....1
The strength of the wire rope shall be determined using the following:
Load Increase Factors =1.25 (or as appropriate)
Strength Reduction Factors =0.09 (or as appropriate)
(Ultimate Strength) x (Strength Reduction Factors)
(Design Limit Load) x (Load Increase Factors)
* See appendix # 1 for further explanation of this formula and its
various factors.
4.29
For vertically moved technical stage equipment the
wire rope shall be dimensioned with a minimum safety factor of eight (8).
Attachment of Wire Ropes
4.30
Wire ropes shall be attached safely and durably. Installation of attachment devices shall meet manufacturer's specifications.
4.31
Wire rope end attached to drums shall be positively
secured within the drum.
Slack Line Safety
.100I
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5.4
5.5
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5.6
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5.7
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4.32
In motorized vertically moving technical stage equipment, using wire rope wound on drums, a device shall
be present which immediately stops the drive when the
wire rope becomes slack.
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5.8
4.33
All rigging equipment shall be designed with those appropriate safety and protective measures detailed in
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section 3.
5.9
SECTION
5
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The visual signals shall be placed in locations so a~
to be visible to persons endangered by the movemenl
of the equipment.
The visual and audible signals shall be placed at all
operating locations.
All personnel including new employees and person~
who are temporarily present on the stage shall bE
instructed in the purpose and the use of the signals.
Instructions shall be posted at the stage entrance(s).
Trap door covers shall be opened or closed only under
the direction of a supervisor. The openings in the
stage floor shall be promptly and properly secured
when not in use.
Permanent trap covers which are built into the
stage floor shall incorporate concealed lifting devices
accessible from the stage surface.
Temporary railings and warning signs shall be
promptly erected. The railings and warning signs may
be removed during performances and rehearsals but
shall be replaced promptly upon completion of the
rehearsal or performance.
Captured stage machinery may be entered and exited
only after instruction from a supervisor; all safety requirements shall be observed with utmost care.
In entry or egress from moving captured stage
wagons is required, measures shall be taken to ensure safe footing.
Combustible decorations, scenery, properties etc.
shall not be stored in the trap room or the machinery
areas.
MACHINERY CAPTURED IN THE STAGE FLOOR.
5.1
5.2
5.3
-16
In the case of removable and disassembly type turntables the safety measures shall be explained in the
operations and procedures manual.
Appropriate warning labels shall be permanently attached to the equipment.
The horizontal distance between fixed and movable
stage floor surfaces shall not exceed three eighths of
an inch (%"). The vertical distance between fixed and
movable floor surfaces shall not exceed one eighth of
an inch ('/s ").
The movement of captured stage equipment shall be
indicated by both audible and visual warning signals.
The audible signal may be disabled during performance if the signal interferes with the performance.
The visual signal shall remain in operation during all
periods of movement.
Tlll'aln- De,ign S. Tt-ehnolog)
L'SI)'I
SlIlllmer )yS6
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GLOSSARY
ACT CURTAIN Also called Front Curtain or Main Curtain.
The curtain closest to the proscenium that opens and
closes to expose the stage area to the audience.
*
APRON The area of the stage that is in front of the
proscenium.
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AUDITORIUM The area where the audience is seated. Also
called the House.
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BATTEN A steel pipe or wooden bar used to support scenery,
curtains, and lights. Usually suspended from the grid
or roof structure.
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011
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