Theatre Design & Technology - Spring 1993 - 44

rions. Cable rhar carries audio signals of
widely varying volrage levels is physically
separared, and audio cable is separared from
cables supph'ing orher seryices (see 51debfll/
AC power wiring as illusrrared in figure
3 represenrs rhe laresr developmenrs in rhe
Narional Elecrrical Code. A ferro-resonanrrype AC power condirioner is specified for
volrage regularion, as well as surge prorecrion and isolarion from rhe power line. The
capacilY of rhis power condirioner is calculared ro provide peak sysrem currenr
demand. All sound sysrem AC power ourlers are derived from mis clean power sysrem
and no orher sysrems share rhis service.
Sound SYSlem clean power edison-lype ourlers, provided in all appropriare locarions,
have isolared grounds and are orange in
color ro disringuish rhis service. Also, a
stage-area AC power disconnecr is specified
for rouring producrion rie-in ro rhe audio
clean AC power sysrem. This a 208
wyel 120 Voir, four wire, rhree phase, minimum 60 Amp per leg (usually 100 Amp per
leg), fused disconnecr wirh oversized lugs ro
accepr 4/0 cable, and an isola red ground.
(Bare wire rails conrinue ro be rhe de ftcto
srandard for ponable AC power disrriburion
sysrem connecrion ro rhe local facility AC
power service.) The in-house AC power sysrem incorporares auromaric power sequencing ro prorecr e1ecrronics and speakers.

Auxiliary Systems

The lobby, backsrage, and srage areas may
be addressed individually or in any combinarion bl' page mic, chime, console ourpur,
andlor rhe ourpur of room microphones.
(See Figure 4.) Enabling rhe various page
microphones or iniriaring rhe chime auromarically overrides any other program marerial in rhe sysrems. Access ro rhe sysrems is
available ar a number of srarionary posirions
locared rhroughour rhe faciliry. In addirion
remme plug boxes, incorporaring inrercom
as well as paging sysrem access, are locared
appropriarely for rehearsal and producrion.
A porrable srage manager rack, providing
inrercom and paging capabiliry, is supplied
for use wim me remme plug boxe , and the
sysrem is easily accessed by rouring producrions. LED "busy" indicarors show acrive
paging zones on all sysrem panels.
The room microphones make program
informarion available for the lobby, backsrage, and hearing assisrance sysrems, and
for recording, during unarnplified producrions, or when rhe operaror chooses nor ro
make a separare mix ro send ro mese areas.
We consider ir impracrical ro supply a
srandard inrercom wiring sysrem mar will be
useful for many rouring rhearrical producrions which require fairly elaborare swirchboard-rype main srarions and numerous
separare circuirs. Four-channel sysrems are
specified and all four channels are made
available via XLR-rype connecrors ar all
appropriare locarions. The program inpur ro

CON
UIT
SEPARATI
N
Wiring Groups
Sound sysrem wiring is divided inro wiring
groups according to their nominal voltage
levels and signal characteristics:

Group A
Group B
Group C
Group D

Microphones and orner
extremely sensitive wiring
(0 to 100 millivolts).
Moderardy sensitive wiring
(100 millivolts ro 10 volts).
Loudspeaker and relared
conrrol wiring (10 to 70
volts).
Telephone, video, general
conrrol, and digital circuits.

These groups must never be intermixed in
a given conduit!
Minimum conduit separation berween conduits carrying wiring of differenr groups is
as follows (90 degree crossings in close
proximity are acceptable):

42

1993 SPRING

TD&T

.

aH!D'.::l,....'.ยท ,.-.. n,.
~~

A

'

adjacent

B
C

rhe inrercom system is available on rhe
parch bay. Audio from all inrercom channels
is also available on rhe parch bav for documenranon purposes.
Video wiring is specified as well. Connecrors locared rhroughour rhe facilif}' are
wired ro a rack-mounred connecror panel
where signal rouring may be accomplished
wirh parch cables and video disrriburion
amplifiers.
An infrared rransmission sysrem, chosen
ro minimize rransmission frequenc~' confliers, is specified for use by rhe hearing
impaired. This sysrem is accessible via rhe
parch bay.

Conclusion
Experience shows rhar rhe sysrems
described above meer some of rhe needs of
rouring rhearrical producrions while
addressing mosr in-house produerion
needs. Supporr for basic srandards along
these lines from rhe professional communiry may have some influence on furure
insrallarions. Implemenrarion of such srandards should make ir easier and less expensive ro mounr producrions, perhaps ulrimarely expanding markers for performing
am faciliries and for rhe rhearre.
We welcome your cOl1lmenrs.
ffi
Bob Green is a senior cOl/sllltal/t with Jaffi
Holden Smrbrollgh Acollstics, Inc.

0

.

t3

6"
adjacent

12"
12"

-

adjacent

D

- D
12"
6"
6"
adjacent

Minimum conduit separation berween conduits carrying wiring of different
groups and orner electrical service conduit is as follows:

OTHER SERVICES

GROUP A GROUP B GROUPC

GROUPD

24"

12"

6"

12"

6"
drcuits
All other services not SCR 6"
controlled or switched
24"
All other services
SCR controned or switched

6"

adjacent

adjacent

6"

adjacent

adjacent

12"

6"

12"

Dimmer controlled
hghting

220/440V

Note: Unusually heavy currenr demands in or long parallel runs with the
above services may dietare grearer separations to avoid interference in rhe sound
system.



Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 1993

Contents
Theatre Design & Technology - Spring 1993 - 1
Theatre Design & Technology - Spring 1993 - 2
Theatre Design & Technology - Spring 1993 - 3
Theatre Design & Technology - Spring 1993 - Contents
Theatre Design & Technology - Spring 1993 - 5
Theatre Design & Technology - Spring 1993 - 6
Theatre Design & Technology - Spring 1993 - 7
Theatre Design & Technology - Spring 1993 - 8
Theatre Design & Technology - Spring 1993 - 9
Theatre Design & Technology - Spring 1993 - 10
Theatre Design & Technology - Spring 1993 - 11
Theatre Design & Technology - Spring 1993 - 12
Theatre Design & Technology - Spring 1993 - 13
Theatre Design & Technology - Spring 1993 - 14
Theatre Design & Technology - Spring 1993 - 15
Theatre Design & Technology - Spring 1993 - 16
Theatre Design & Technology - Spring 1993 - 17
Theatre Design & Technology - Spring 1993 - 18
Theatre Design & Technology - Spring 1993 - 19
Theatre Design & Technology - Spring 1993 - 20
Theatre Design & Technology - Spring 1993 - 21
Theatre Design & Technology - Spring 1993 - 22
Theatre Design & Technology - Spring 1993 - 23
Theatre Design & Technology - Spring 1993 - 24
Theatre Design & Technology - Spring 1993 - 25
Theatre Design & Technology - Spring 1993 - 26
Theatre Design & Technology - Spring 1993 - 27
Theatre Design & Technology - Spring 1993 - 28
Theatre Design & Technology - Spring 1993 - 29
Theatre Design & Technology - Spring 1993 - 30
Theatre Design & Technology - Spring 1993 - 31
Theatre Design & Technology - Spring 1993 - 32
Theatre Design & Technology - Spring 1993 - 33
Theatre Design & Technology - Spring 1993 - 34
Theatre Design & Technology - Spring 1993 - 35
Theatre Design & Technology - Spring 1993 - 36
Theatre Design & Technology - Spring 1993 - 37
Theatre Design & Technology - Spring 1993 - 38
Theatre Design & Technology - Spring 1993 - 39
Theatre Design & Technology - Spring 1993 - 40
Theatre Design & Technology - Spring 1993 - 41
Theatre Design & Technology - Spring 1993 - 42
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Theatre Design & Technology - Spring 1993 - 46
Theatre Design & Technology - Spring 1993 - 47
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Theatre Design & Technology - Spring 1993 - 66
Theatre Design & Technology - Spring 1993 - 67
Theatre Design & Technology - Spring 1993 - 68
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