Theatre Design & Technology - Fall 2014 - 70

Right, examples of switch covers used to prevent
accidental operation. Below, an example of
signage posted on a guarded machine warning of
the hazard posed by the machine.

5
or drum assembly. Such a machine (device) must be safeguarded
against hazards.
Safeguarding can be accomplished by a number of
methods:
* Enclose the machine. In the example of figure 2, the addition
of expanded metal to the outside of the frame would protect
a person from contact with the moving parts. Motor-driven
line sets should be similarly enclosed. Figure 3 shows a
guard placed to prevent inadvertent contact with the moving
chain of a motorized line set.
* Locate a machine in an inaccessible location. For instance,
something twenty feet in the air is not accessible to casual
contact.
* Locate a machine in a remote, secured location accessible
only to authorized, trained persons. The locked door of this
location should be well marked with information about the
hazards inside the room.
* Lock control stations to prevent unauthorized persons from
causing unexpected or improper use of a machine or lift. Do
not leave keys in access locks (fig. 4). Keys should only be
used by trained, authorized persons.
* Use safeguards that prevent accidental operation of a
machine, as shown in the example in figure 5.
* Post signs. Even guarded hazards should be accompanied by
a warning of the hazards. An example would be the pictogram
in figure 6 that could be displayed on the assembly in figures
2 and 3. Signage, however, cannot be used in place of proper
guarding.
* Administrative policies. Administrative policies and
procedures can be used where other methods of guarding
are not feasible nor practical. One example is safeguarding
access to the grid which can be restricted by policy to only
trained and authorized persons. Signs should be placed at
appropriate access points to inform everyone of the policy.
In the case of grids, this method works because access
points are remote and not generally accessible.
Always use the simplest, most effective method for
preventing people from becoming entangled in or injured by
70

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2014

6
machinery. Ignoring the problem is not an option because after
any accident, one of the first legal questions will be, "Was this
accident foreseeable?"

MainTenance
Although it's not always obvious, maintenance is also a
safeguarding consideration that serves several purposes:
* It helps prevent machine failure.
* It keeps the machine working at its top efficiency. A machine,
especially a tool operating at less than top efficiency, poses
hazards to the operator and performers.
* It prevents accidents to personnel caused by failure of the
machine. Failures can cause falling parts or scenery which
can result in injury. A performer flying system that isn't
maintained properly can fail, resulting in performers being
injured by falling.

inspecTions
Inspections are an integral component of proper maintenance.
Worn or failing parts constitute a potential hazard. Inspections
can be triggered by the manufacturer's recommended schedule.
Inspections can also be triggered by improper operation or
unusual sounds or something not looking correct. Inspections
should always be performed by a qualified person familiar with
the particular machine and all of its component systems.
Tools should always be inspected before each use. The
use of stage machinery in performance is a form of inspection.
Does the system sound and/or feel right. An example is a manual
counterweight system. During operation, anything unusual
should be noted and investigated. A basic list of things to look for
during inspection (and use) includes:



Theatre Design & Technology - Fall 2014

Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 2014

Contents
Theatre Design & Technology - Fall 2014 - BB1
Theatre Design & Technology - Fall 2014 - BB2
Theatre Design & Technology - Fall 2014 - Cover1
Theatre Design & Technology - Fall 2014 - Cover2
Theatre Design & Technology - Fall 2014 - 1
Theatre Design & Technology - Fall 2014 - 2
Theatre Design & Technology - Fall 2014 - Contents
Theatre Design & Technology - Fall 2014 - 4
Theatre Design & Technology - Fall 2014 - 5
Theatre Design & Technology - Fall 2014 - 6
Theatre Design & Technology - Fall 2014 - 7
Theatre Design & Technology - Fall 2014 - 8
Theatre Design & Technology - Fall 2014 - 9
Theatre Design & Technology - Fall 2014 - 10
Theatre Design & Technology - Fall 2014 - 11
Theatre Design & Technology - Fall 2014 - 12
Theatre Design & Technology - Fall 2014 - 13
Theatre Design & Technology - Fall 2014 - 14
Theatre Design & Technology - Fall 2014 - 15
Theatre Design & Technology - Fall 2014 - 16
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Theatre Design & Technology - Fall 2014 - 19
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Theatre Design & Technology - Fall 2014 - 42
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Theatre Design & Technology - Fall 2014 - 45
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Theatre Design & Technology - Fall 2014 - Cover3
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Oct
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
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