Theatre Design & Technology - May 1968 - 40

At last a flexible multi-conductor system has been developed
which allows tapping into an electrical feed at any point,
removal, and re-use at any time. The system uses Power
S ru for he raceway (competitive with Unis ru ) and provides for inserting a flat PVC three-conductor-plus-ground
cable for use as illustrated.

A theatre laboratory could have a series of thirty foot lengths
at five foot intervals, also covering thirty feet. These seven
runs could all be fed into a larger raceway at the side or
center, providing a IOtal of 21 individual branch circuits if
fed from the side and a total o( 42 would be possible if fed
from the center of this grid. Ganging would not be difficult
and with the 30 ampere capacity, the circuits would not be
limiting.

The conductors will each carry 30 amps, allowing heavy or
light equipment to be used. The taps used for making contact are similar to the lighter utility types developed for use
with ripcord (zipcord) and simple to connect. Since the
three conductors are evenly spaced across the flat cable,
the tarS must be designed 10 pierce tile cable at the selected conductor location. An immediate application comes 10
mind for providing three branch lines per run of Power Strul.

A variety of attachments and fixtures are available to allow
instrument attachment and extensions. The taps can be purchased for $1.75 each, the cable at 20¢ per foot, and the
Power Strut at 35¢ per foot. The material is called CHANL-WIRE and is available from INSUL-8-CORP., Box 697,
867 American Street, San Carlos, California.

"lnsul-8 Chan-L-Wire" Contact Conductor System

The fast-developing field of tungsten-halogen
again offers two new developments in the
range for the theatre. Both General Electric
have new 2,000 w. lamps in this field and

light sources
high-wattage
and Sylvania
Sylvania also

offers 5,000 w. lamps.
While the prices of tile tungsten-halogen line are Iligher
tllere is also a general increase in I ife. Certainly tile bulb
size becomes smaller (except for the glass-jacketed 2,000
w. G.E. lamp). However, the most important consideration in
conjunction with a longer life is the increased total of mean
lumens through the life of the lamp as compared to initial
lumens. A comparison of the G.E. 2,000 w. quartz T-30
with the standard T48 and G48 (all listed below\ shows a
steep decline of efficiency during lamp life: 96%, 90%and
74
respectively. As predicted when the tungsten-halogen
lamps were first developed, the useful lumen/watt ratio,
longer life, smaller bulb size and smaller and lighter luminaires gradual I are providing the theatre with another revolutionary improvement of its tools. On the basis of these advantages the prices are competitive as well. Anyone wishing
a much more detailed examination of the problems of higher
wattages in these lamps should examine D. R. Dayton's
"Quartz Halogen Lamps - Two Kw and Up," in Journal of
the Illuminating Engineering Society, April, 1968, Section I.

oa,

2,000 AND 5,000 WATT LAMPS, MOGUL BIPOST BASE DOWN, 120 VOLTS

ORDER
ABBREV.

ASI
CODE

MFCTR.

WAITS

BULB

LUMENS

AVE. RATED
LIFE (hrs.I

LCL
(IN.)

PRICE
(Approx.)

LINE
3,350
3,200
3,200
3,300
3,200

100
300
500
150
300

5
5
5
6'/,
6Y,

35.00
35.00
85.75
110.00
110.00

3,200
3,200
3,200
3,200
3,250

100
100
150
150
75

5
5
6Y,
6Y,
6';'

22.00
16.75
48.00
39.00
75.00

COLOR
TEMP.
('K)

BWB
BWA
Q2000T30/4CL
DMZ
DMY

SYL
SYL
G.E.
SYL
SYL

QUARTZ, TUNGSTEN-HALOGEN LAMP
2,000
T 8
64,000
2,000
T 8
58,000
2,000
T 30
57,500
5,000
T 17
152,000
T 17
5,000
135,000
STANDARD TUNGSTEN-LAMP LINE

2MtT48/1
2M G48 18
5MtT64/3
5MfG64J7
5M T32

G
G.
G.
G.
G.

E.
E
E.
E.
E.

2,000
2,000
5,000
5,000
5,000

T 48
G 48
T 64
G 64
T 32

57,600
57,600
141,000
141,000
155,000

THEATRE DESIGN AND TECHNOLOGY

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