STRAND TELEVISION
LIGHTING CONTROL
System . . . "C n
Studio ... Riverside I.
Ref: ... RIV. 1/R.&.D/2/8/1955
LONDON
MANCHESTER DUBLIN MELBOURNE
SPECIFICATION
of
STRAND :1~IGltr irHI CON'_1_'ROL. SYSTEM 11C
B, B, C, R=v:c;RS lDE :rro:OIO I.
348 CIRCUITS. 166 CHANNELS
REVISED AUGUST
11
1955. RIV .1/R.& D/FPB/Z/'8/1955.
2
SP:OOJFICATION STRAND LIGIB'_lli9: CONTROL,
B.B.C.
RIVERSIDE STUDIO I. REVISED AUGUST, 1955.
~~,
· 1, SJMMA.RY: This studio to oonsist of ~ circuits (384 sooket
outlets) controlled
of oircu:I:td to d:i.rmrers to be by selector switches. All dimmer
and switohing ( including patching) to be eleotro-mecha.nioally
operated from remote pilot desk a.ni panels in oa.mera. control
room.
2. CONTROL DE3K: ';rhis is t9 consist of a centre table approx.
by 166 channels each with a d:i.rrnlEr. Pa.1>ohing
42 inches wide x 24 inches x 31 inohes high, with a vring panel
3ft.wide x 4f't high x 12 inches deep (max.) each side. The
assemb]y is a.tTonged to be used by a seated operator, rut the
supply of the chair is not included. No integral lighting of
oontrol lever~ or plot desk is provided and the B~B.C. should
supp]y
an overhead fitting (suitabJy masked) for the purpose.
The three desk components are separate run floor cable entries
will be regµired for each. Entry to the wings and table is
intended to use the hollow legs, but wiring aoccs3 to the ocntre
table
B.B.O. requirements in auxiliary (non~lighting) controls are
fully
will have to be more cxactJy determined on site when the
known. All O<?mponents are intended to be rigidly fixed.,
bolted to the floor, an:l. olearanoe to allow rear access for
nnintcnnnce, .
will be ?1.e9esso.ry. Position is shown on B.B.C,
Drawing e .. I.D:SK:476QM•
~· LEFT WING P.AnEL: See Strand Drg.B&D 28246. Tvvo rows each
af 14 pairs of dimncr levers o.nd four of sixteen. The left
lever of eaoh pair will have a black lmob and the right lever
a red lmob. OvGr OD.Oh pair of lavers will be a Compton luminous
push with electric reciprocating action to switch the oharmel
oontactor on and off. Luminous heads to be engraved with channel
Dllribers
( e.g. IX, 7Y eto,) an:3. the ln.bel at end of ea.eh 14 way
/. - ·
rem to show the detail in the inverted commas schedule below.
oont.-
-2-
End of row also to aooomnodate pair of lwninou.s heads showing
whioh pr:-esct-, blaolc or roo., is in use. These heads ore also
gperative.
Top RC1N,
2nd.
3rd.
Z,.th
,5th
Bottom Row
Channels DC to
"
II
II
II
II
ft
II
II
"
l4X
lY to 16Y
IZ to
IX to
IY to J.6Y
IZ to l& "Twin
16'1:
14X
1
'Red." :i;hase.
ff 1 /2 I::. 'i1 • "d :tr:rc.
II
Sing le" oonto.ctors •
1
'White~1 pho.se.
11
1/2 k • ,..., •" d:i.ttJf:r
11
oontactors.
4, RIGHT WIID PANEL: Three rows to oo:rry 16 pairs of levers
per rem one row: of fourteen pairs- one row of twelve pairs
a.nd the bottom rt:N! is free for B.B.c. ancillary gear,
Top Row., Channels IX to l4X
2nd "
,3rd "
l,.th
II
II
II
Gantry
'IY to l6Y
JZ to l.6z
1 to 8 ) "'2.k.w.T-.~'d.inlrncf
"Blue" phase.
11
0.5/I k.w:clinmers.
"Single" oonto.ctors.
!
Control~ for 4 x 5 k.w.dinnle?'S
5th Row, Floor l to J.6
Bott~ row. B.B.C.genr where applicable.
CENI'RE TABLE:
top
and netal frame and legs. :Mounted on the to.blc top will
be two self-contained po.nel boxes with sloping fronts, one for
the Strnnd !faster Lighting Controls; tho other for those of the
auxiliary oontrols required by the B.B.C. which may be considered
pa.rt af the lighting operator's activity.
6
$l'RAND PANEL CONrROLS: (see Drawing R .&: D 2834).
1
(a)
(b).i."Switching
This will be flat with Buff Linette Formica
•
"Dead Blackout" (separate Black Ta.blot Switohes
to left and right wings).
Hold" (one tablet type green).
11
~
2 k.w.T"dinmers,.
I "Blue" phase
••
(o) ... "Lit Move"
(d) Red dinmer preset (T.mninous push red lotta:-6 on
( e) Black II II ( II II blJl.ck letters on
(one sprung off nmbcr to.blet).
white).
White).
(f').+."Switohing Prcsetter" (sprung off p..1.shJ.
cont.-
(g) "Switching P.resetstt (20 sprung off pushes).
"Cancel'•
All Off (one push).
(h).+. "P.reset Add" (sprung aff pish).
(i) urnd.ividua.1 Go" 2-way sprung centre white tablet.
( j) Mptor Speed.. Two balanced ped.o.ls of eight stations
with pilot lo.mps. Coupler norroo.lly joining
left bank to right for speed. Left and right
po.irs cover left and right d:i.nlrer banks.
,-
Speeds to be:- 2 secs,3, ~ ,7
45 seconds dimmer travel, Slower speeds ·
autonntio with switch~ potentiometer.
( 15 mins, slmvest speed). Inching controls
and speed pilots onl;y on panel.
10,15,25 rurl
1
tk) Indicator Dio.ls: Two uncalibrated for left
rurl right wing preset cho.ngeover respectiveJy.
One calibrated for In:lividual Position.
1
( l) •
outstation On"• Red tabiet ewitch (See 8
below).
e+• These control:! are duplicated by foot pedals•
7
PAN.EL FOR .B.B.C. CONTROLS: (see Thvg.No,2835). The
1
following apparatus requ:ircd by the B.B.C. will be m:,unted.
where ~lioable as part of the lighting control, or as a wall
m::iuntirlg panel.
(a) l Flush mounted 4" sq~e patt~ voltmeter,
Grade. I to BSS 89, 1954. Soo.led O·l50 volts
Metro.-Viok or ~quivalent,
(b) l Flush type 3~ voltneter selector switoh.
(e) 3 .Amneters e.s (a) above scaled. 0-500 o.mps,
auita.ble for working from 500/5a.n;,.ourrent
.transformers (not supplied under this
oontra.ot) with e. red line at 350 amps.
(4) l Flush type voltage control selector switoh
labelled "Auto Control :Fhases A~., Auto
Control Phase 0# Push butt on control" .. ( as
Brentiord Transioriner Drg.No-1> .. .5686 20/tVs·; ), ...
I. ,' I
oont, ..
(e) 1 set of flush type push buttons la.belled.,
"Rnise Volts.,
Lov,cr Volts".
(f) l Pro-set volto. 3e control potentiorooter
to give t. 3% voltage control, 35 ohm
l amp. Scre wdriver operated with looking
I
rn;rt, no son.lo.
(g) 3- Flush mountcc1 type, English Electric
Type NS.HRC. 2 ariip.~ses for
208/120 volt
(h)
Monitor control.
Ta.lie back,
(i)
(jy TELEPfIONB6
supply.
inoomi.ng
•
The wiring for A to G above to be brought
out to OBA stud terminnls to which others
will
o.nd 4 core 7 /029 wire a.rimured uo.bles to
be
Items H. I.J. to be brought to terminals
ns ap pr opriate no entries being provided
but sheet
as others
connect. Glo.nds for 10 core, 4 core
provid ed .
moto.l spn.ce for holes n.nd glands
~
suppJ,y an:1. doterr_tlne. Panel
mounting spa.oe of approx. liD sq.ins. to be
allowed for on:l. apparatus will be supplied
by B.B.c. for eiruJcxliment.
~· OUTSTMION CO~"TROL. 12 terminnls oontrolled by "outstation on"
switch to permit presets to bo opcro.ted. from pu:3h buttons in
studio or in producers control room.. These lo.tter a.re to allow
olose synchronisation with oo.rncra change-over if and when
desired. Externn.l wiring
i:naluded.. Relay circuit to eewe;p; switching n.otion "on set"
to momenta.cy oontn.ot.
a.n:l. outstt.'l.tion push button boxes not
e on "<U··t
oont.-
-5-
2· P.A.T,C}.IING ,PANEL. This will be identioo.l physioo.lly with the
left wing panel. It will canto.in ror,s of ei~ht position vertical
selector S\llfitches., s:i.milnr in form to the dimmer regulating
levers in 3 and 4 above. There will., l_im-revcr, be one suoh unit
to ea.oh control ohunnel instead of two. Above ench will be n
sprung CJff switch with on engraved tablet knob (o.s label) in the
approl%"iate phase colour. This switoh is helcl down to obviate
flashing
(There is no electrico.l reo.son against this flnshi.ng
o:f lights on positions interroodin.te to the one required,
it is to
1
obviate visual nuisame. In oonsequenoe., no mechanical interlock
will be provided; relin.noe to be on opera.tor drill sup:plenented
by advice label), Ili.yout to be as follows: - (Drawing No. R. & D • .381·.3 ).
Left Jl!- lev-ers for X Red phase.
II
II
X Bluo phuse.
~Row,
Left 16 levers for Y Red phase.
II
Right
16 "
Y Blue pho.se.
,2rd Row •.
Left 16 ievers for Z Rod phase.
'
Right 16 "
II
Z Blue phn.se •
.Z,.th Row.
---
Left Jli-levers for X White Ph.nsc.
Right 21+
2,th
Left 16 levers for Y White pho.se.
Right 28 3-ao.y switches for YI to Y.28 White
6th Raw...!..-
Loft 16 levers for Z White phase.
R:ight 28 3-no.y switches for ZI to Z28 '\Vhite
3-·wey switches for ;q: to X24 White
Twi11 Circuits.
Ron • .
Twin Circuits.
Twin Circuits.
oon:t.-
-6-
101, PA~CHlliG LEVERS: To be at ons inch centres. The 3-way
switches for the twin circuits will be mounted in two rows
to every single raw of the selector switches. · Each of these
switohes in the middle position connects both aub circuits
(" 2 aooops
,ipd. in the bottom the right o.nJ.y. Pa~ching levers on 16
11
:in the top position the left oircuit only
);
ohan:nel groups will be wired as below. The e~th _position
11
(bottom) will be labelled O and will be 11of'f
,
i.e. channel
free:-
Nool lever (left) circuits 1 ... 7
Noo2
Noo3
No.4
No.5
No,6
No,7
No.8
No.9
"
II
II
II
"
II
II
II
II
8,2 ... 7
8~ 9,~-7
"
II
8-:-11,4,:-7
II
8-:-11,~~7
II
8"."'J2~6-7
II
8-:-13,7.
8-~
"
15-21
"
No.lp "
No,11
No.12
No
No.J4
No.15
No.16
11
11 tl
11
],3
0
"
11 II
11
22,16-21
"
II
22,23.,1741
22,24,1.B~l
II
22"."'25~19.....21
II
22':"26,2P,21
22"."'27,2)..
II
22-28
J?atahing levers on J4 ohannel groUp:3 will be. wiroo. as follo.vs :-
No41 lever
No.2
No.3
No,4
No,5
"
II
II
II
o:l.rcuits
II
"
"
II
.1~7
8~2-:-7.
a,9,1...,..7
8':"10 ~1.v:-1.
8"."11,5':"7
No.6
No.7
No.8
Noo9
No.10
•
"
II
II
II
II
a.:.12, 6, 7
II
J,,;-19
,,
20,Jl+.-19
If
20,21, 15-19
s;..12, 6, 1
"
cont ....
-7-
No.11 '
No. JJ?
No11~'5
No
In both the above layouts, where a horizontal series of
positions on the s0lector svritches control the same circuit.,
only the end numbers will be cngro.ved.
dashes will be engraved., nnld..11.g it easy to see if two dimroors
have been pn.tohed to one circuit. (There is no electrioo.l
lever circuits
II II
II
w
11:-
0
20"."22., 16-19
20".'"23., 17-J.9
II
"
0
20-24, 18-, 19
20-24., 18., 19
On the intermediates
objection to such patching it is a rmtter at inconvenience
only). The above system not only gives a very oo!!Ipaot
panel., which OP.!l bo plncoo adjacent to the nnin lighti.."YJg
control., but a l so •; 0::-:;r clear incl:i.cat ion of th(3 patching
potential nnc1 WDfal ;:;ot u.1,, the state of patch. The patch
is easily clear ed befo r e eo.oh s c/ct:i.ng up~ since it is on'.cy'
necessary to p.ish all levers dan n to the bottom zero position.
11. _MA.---'-IN--'-C'--.ONTR:_;._"--OL;..._OAB_LE_...,_: This will be 175ft long and oonsist
at all 15 volt nrrl 50 volt D.C.wires and their mains required
between the li ghting control and the patching control and
the Strand equipm:mt in the d:imner room. This control cable
will be supplied in a single or twin co.ble in flexible
meto.llio
oonneot the ends. All other wires will have to be run am
hose or hoses by Strand Electric, who will also
oonneoted to the appropriate terminals by the wiring
contractor.
The running, fixing and further protection,
where neoessary of cables in this section is not included.
- ·
12. D00 ,1EE.LIDCTvi;_ Iayout to be ns Strand Drg.A. 716. There
will
operated ballksa The le.ft bank will oorresponc1 to the left
wing of the control desk lighting (phases red and white)
e.nd the right bank to the right wing (phase blue)• Ea.ah
bank to be extended by a. section far the patvhing relays
be two standard 5 tier Strand P.R. eleotro meohanioalzy"
oont.-
-8-
1.3.
rx.:..JJiX Red phase 14 x 1CX)0/2000w Resistances.
IY-16Y
IZ-l.6Z
rx.:..:uix mute
IY-16Y
IZ-16Z
LEFT BA.NICI DJJvIMER SCHEDULE.
I • 1 -
II
II
II
II
II
"
II
II
II
16 x
16 x
14 x
16 x
16 x
-
92
"
"
II
II
II
II
"
ff
II
"
II
"
II
II
"
JA.• LEFT BANK: PA:t:~ JNG SCHEWIE.
Channels
II
" r.z -16z
IX "."Jli.X to circuits . XI- X241
IY -16Y " " YI- Y28
. .
11
" ZI- Z28
Re1. 1J2 relays
Channels IX: - J1i,.X t o o:ircuitsXI- X241 ) 98 relays
II
II
Oirouits XI to X24 Wx1itc;
IY - 16°"! " " YI- Y28 White (112 releys
. (
JZ - l bZ " i; ZI- Z28 (112 relays
each to Icl't
and
98 relays
1J2 relays
!
or Right 48 re~
"
"
1,5
RIGHr BA.Ni(: DIMJ:-1:ER SCHEJDUIE ••
1
'
YI to Y28
ZI to Z28
II II II
II
II
II
II
II
"
II
II
It
IX ... J4X Blue phas e J1+. x 500/J.OOOw ~is ta.noes.
II
11
II J.6 X II
II 16 :X
"
8 x 2000.V T:ransf'·ormers.
II
II H
It
II
Floor 1-:-8 Blue phn.se 8 x 2ooow. Trans:rorroors.
"
16
Channels JX ~Jli,X to oircui ts xr.:..X24l
9-16 II
RIGHT M.NK: PATCHD""m SCHEDULE.
1
II !Y .:..16Y
" lZ -16Z
8 x "
"
11
" Z I-Z28
c:::::::-----
YI.;.Y28
It
( 98 rel.Dys
{1.12 tt
~"
,322 .
1t
5;6
"'~~
004
If
releys to be of the 20a.r!IJ.J.G/S type. There is l'.YQl patohing to
All
a.uto transformer and 5 k. w • channels.
11· SWITCHING sumAINER HOLD.,
All patching selt.."O'tor switohes and blackouts on non patched
~ha.nnels
relay (166 in o.11). This ~ill in turn feed the sprung closed
switch abov-e each selector. The object of the sustainer
will ·ao.ch. be fed from a N.E. I. wire contaot sustainer
oont; ...
-9-
relay is to allow reverser output oontn.cts to 1Je uncoupled
f'rom the lighting relay and used to reset the 1rescts during
transmission
used
as circuit bln.olcouts.
if necessary. The pn.tching relays are in faot
:1;81 ACTION & MOTOR RECTIFIERS.
Two 3-phase transfor mer am. ootal rectifier units will be
supplied. one to
stand~ thlb other.
Outputs to be: -
15-17
volt D.0.200 o.mp.
50 volt.n.c. 65 amp.
Input to rect :i.f'ier trans f armer to be f ec1 through 3-pole
oontactor with J20 voh :]O cycle coil ener gised from desk
and d:unmer roo m~ Sus tA..L1er contact of contactor to be
tripped by overlo n.d r eJ.ay in 15 volt D.C. rnains. H.R.C.
fuses a s below,
in add ition.
Output: 15-17 volt 1. 100 amp.Positive Left bank:.
One "
11
Ri ght "
• " " Main relay desk
50 volto One 15amp.Positive Left bank and Left 1Jing )P.R System
One
II II II Ie:f't II Motor
n " " Right " Motor
11
Right
"
II
and Right
~· MAIN ACTION RELA.J. _ .
Main oomponents to be: ..
168 rmrersers ·:.with seplJ:'O.te nnin to off coils
n.rrl to jiggers.
Two 20 preset setter relays eaoh of 84 stops.
N/C nyO blocks to rem:,ve nnin from off ooils.
a.nd jiggers.
N/0 nnd N/0 M/0 blocl<:s for setter action.
Couplers for "Lit :Move"
II
II
II
"Dimmer P.t-eset0 Black ar.il Reel
(50 volt).
If
"Lighting Hold".
11
)
II
II
"Individual
Go"
The above reley'a will 'be mounted in ma.hogan;y boxes with
renx:,vable lids back rum front a.a ata.nd.ard Compton practioe
on their pipe organs . in the concert halls at Broadcasting
House and Maida Va.lee Relays will be oarried on hard wood
frrunes but Stro.nd. bakelite testboa.rde will be ~itted.
oont.-
---~--
,..,,.~~~~
-10-
n.c.c. waxed w:iring will be used on all 1.5-17 volt circuits
on wood
framed section D.c.c. and eno'Unelled wire to the small
section devoted to the 50volt polarised rel.oy _oontrol lines.
20. D:Q,1h:pg··L)¥-Wi§i (Strand drawings A. 721 & A. 722)
There wi l l b0 tw·o of -i.;ho St r and P.R.type with electro
rooc..hani 0al ~.:::~:; :!. 'Jll.:1 "b' J.~ c.:d ~nd.ed by sect ions for re 1mte
patching rela ys
For sch edules see 13, Jli.., 15, & l6 above.
4
(a) Di.J ;;.Eier b~ {s will be arronged with five tiers
of di mmers. All shafts are chn.in oouplec1 together
and dr iven by a geared motor unit in the centre,
o:r ample power to start when loaded with n.11
J.imr,JG.r8 a:~ c..11 speeds. Clearo...'rlCe is all owed
that t b.e ootor may be ,m1Ji:;,ltec1 and removed
so
fro m t he bD.nk for inspection.~e shai'ts ore
provi de:!. with seJi'-o:ligning ba.11-b~~~s.
T el ernotor motors are vn.riable ~- · ·- :.
T~~ .
',!_.:t speed 50 volt D.C.,mits,Normn.n Electric
ty pe 200 Gee.red unit nominn.l output 9 r. p.m.
givi ng
to
n. r ange fro m 2 socon:ls c1immer travel
45 seconds. Motmted in the centre af
each di mner bn.nk above the motor is the
"sett er unit" which is pernruient]y couple:!.
to the corr«;3sponding inlioo.tor dial in the
remote
desk, and which indicates the aril),mt
of travel imparted to the dimmers when
oho.nging -over f~m one dimmer preset to
another.
,v
(1:,) D:i.mners are of the Tn:io "A" Ele ment Sunset.,
with
the resistance vdre ( nickel copper alloy)
wound on for mers. There o..re 100 oontaots(apprexlC.)
devot ed to the resistance steps, the stw:1s
o.t the full on o.!1(1 blo.okout ends of travel
being n.c1.clitio:rw.1. D:imrrers are theatre rated
so th at they may 1:,e lef't in interrnedin.te
oont ...
i
,-,.,.,
-n-
positions for o..n,y reasonable length af'
t:ir.e. On J20 volts the limit to a
single
Dimr.iers
af plus or mirus J/3, vrhich means, in
f'o.ct, 500/1000 or 1000/2000 as shown
d:l.riuner plate is 2000 watt.
will be wound for a. tolernroe
in schedules 13 o..nd 15.
(o) Mounted on each dirmncr is a 1000 ohm
50 volt D.c. potentiometer which maves
with the dimmer arm and always rerrnins
live. This potentio:rreter is part of
a 11heatstone briclge circuit and enables
the position
whe~her
not, The potentioIIDter is shuntoo by
af n:ny dimner to be preset
the nnin dimmer is a.live or
o. fixed resistance 2000 ohm between
centre arm o..nd the dovm end for theatre
work n.nd centre and :full-on for television.
This ensures that the dimirer con be
moved even if o. potent iorneter opens
circuit.
(
d) A poln.rised relny (Telephone Mrun.lf n.cturing
"..ny type 6BI or equivalent) is carried
Comp ..
o. bro.cket o..t the low voltage end of the
on
dimmer. Relcy" ho.s plug base o.nd is used
to determine
with the potentiometers on
d:i.rmmr position in conjunction
dimner and desk,
The relay is complejely enolosed nnd d:inmer
r
potentio:rooters ho.ve
will be shunted by rectifier
dust oovers, Clutches
type suppressors
to preotect polo.rised re:lll.y oontaots.
( e) Dimmers are driven 'by· p:i.irs of mo.gnetio
clutches Strand EJ_ectric Po.tent, to ITIOl."e
11
up" or "dmm" from the uni-dir ect ioro.1
cont.- .
-12-
she.ft• The design af the olutch is suoh
that n. d.:i.rnrror oo.n o.lways be moved by hand
without the ncoessit-y of going to the
control,
provided the desk presets a.re off•
A button cancelling these is on each bank
testboard. The clutch is die cast, mounts
a.t 5 inch horizontal centres and is split
add or re move without taking down the
to
shnft. The units also incorporo.te springs
to cleur the nBgnet pole pieces from the
wheels when not
freedo m fro m noise. Clutch
fitted ~ith grease nipples anl coils ore
fed vio. P.v.c. twin flex:ibJ..es.
(f) Mo'l:Ulted on the back of each dimmer
engaged, thereby ensuring
arms a.re
(i.e. the end remote ~o the clutch and
driving shnf't) is a oontactor or rel.D.y
of a suitQble size to control the load,
magnetic blrn-wuts being fi"'ctea. for
currents
contactors a.re norr.ial]y open electrically
closed ru:rl are wired in sedes with the
dimmer. The blackout oontactors will be
fed. by auxiliary re lays, used as a
sustainer to cover certain operations,
On circuits vrhere remote operat~
pa.tohing using relays is needed, the
dimrrer oontactor or reley will be
omitted.
of aver 20 amps. These
d:i.mrrers and conto.ctor switches are
The
wired in the phase side o.s requ:i.r~d 'b'.r
the L.c.c. arrl I.E.E. Reguln.tions., the
number of
by these Regulations.
fuses bellll3 also deterr.tlned.
cont.-
-13-
(g) Fuses far 1=40ting circuits nre of ~lish
Eleottjc
S.M. 60. 5% repln.ce J:Jonts in cnrtttages
of vnrious sizes will be included..
All fuses are :mounted together on n
doo.d front SJ.nda:qyo pmel o.t one alld
oooh bn.nk. The renr of this pl!'lel
of
farus n.n
The fuse fus between the live 'busbnr
arrl the dimmer. No further fuse will
be provided.., each. patched circuit being
covered. by its d:imncr fuse on:cy-. All
fus es will have circuit idontif ication.
(h) Wiring: All high voltage wiring :f'rom the
ERO. onrtridge type s.s.25,
enclosed busbn.r ohnm.ber.
d.:i.mlmrs is i..'Yl Enbestos or Rockbestos
heat
resisting cable carried in
horizontal metal trunkings nnd term-
imting
mounted in busba:..
for all circuits except the 5k\v whiah
will have 60 an:[>. lugs ,. Hcutro.1
oorr.icotue; 'buo 1xa-o ore o.lsornountoo
:in this charriber. Neutral links are
not fitted to the lighting circuits.
The contractors wiring and connection
talces place in the busbar cha.ni>er and
at other centralised terminal pomts;
in rru.rnberecl pi.urr:i.el connectors
1
cl1D.!:lber to take 7 /044
:in no case is it necessary for his
wiring to extend along the banks . to
pick up at individual contactora,
relays, etc.
( i) Mains: Cable glands for rm.~ as shown
on
B.B.O. drawing PID.3.322 9. IlI will
be f i ttcd to dimmer banks. Provis ion
..
oont.- .
-:ui.-
is for bottom entry of ma.ins but ligh t :ing circuits
to be taken out at the
three single 3 x 0.4 c.r.1.c. Ma.ins to right bank
2
~
0.4 c. I.L.C. Rectifi er and transformer unit
for Acti on
Strand El ect r ic to provid e cable glands and lugs
(s ee 18 ab ov e) to be 4 core 0.06 R~I.L.C.
top. Ma.:ins to left bank
'f~
but not su ppJ;y/..CJJ! connectio n ther eof.
(j) Transfor mer d:i.rrmers will be installed where variable
load fact or is considered
in 15 abov e ). The auto-tra ns for mer dimmer will dim
to the
capacit y , Thus, 250 or 2000 watts may be connected
t ·o a 2.k W. transformer and the dinming curve will
be the
same curve a ny lo ad within its total rated
same, The transf ormer dimmer fitted to the
important (see Schedule
Strand P.R. bank is a special Strand-Phoenix unit
construct ed on
ar rnnge d
compcns o.t cd s o t ha t what ever type of resistance or
transf ormer d:i.rn.11Gr is use~ th e r esult to the
operat or at th e c ontrol
on the back of co.eh tr an sf or mer d:i.mrmr will be a
20 runp . G/S. r elny to disc onnect the phase side.
This
and off but it is als o fed via a micro limit
on
switch
winding
ciroui t whenever the dinuner is down.
f or 2 kW. The clutch drives are
rel ay oper ates to switch the lighting circuit
at the dim end of travel. The transformer
is thus automatically switched out of
a. standard die cast dimmer frame an:1
d0sk is the same. Mounted.
low-'Voltage action wiring to clutches, limit switohes.,
(k)
contact or coils rurl indicator rheostats is rigidly
mount c.'<l on each dimmer frame an:1 brought to a
connector bl ock at the clutch end. Wiring on
dimmers is by gln.ss br aid ed tinned copper glass
sleev ed whe re necessary for c.xtrn. prot ection. From
dir:i..!ner blocks a purpose Iruldc-up P.V.C. insulated
the
-cont'd-
-15-
cable runs to the d:i.rrnEr oo.nk tcst-boo.rd. where
o.11 wires o.rc labelled and where the vo.rious circuits
co.n be provided with mn.in for testing without going
to
des k or r0luy. Di.n1r,icrs con be 0asi]y removed and
replJ..(:)ed since thoir wiring is tied out so that it
co.nnot be rcc orn:.ectca. wro::--.g ly. Dimmers are provided
with engrav 0d L.'1..bels giving circuit identification
nwnber, name und wattage. The l ow vo ltage side has
identif ico.t ion nu..l!ibcrs si gn-wri ttcn on the main
frame "' :Phasing is illdice .ted. by the colouring of the
Record;
ng met er:::
~
Eilah dimmer bank will ho.ve a
Sangamo West on S 16 ( or equi val0nt) recording nieters
connected betwe en one phase and neutral to indicate
bank hours
in use.
(l)Weights and sizes: (Dimrrer Room) (approx.)
Left Dimmer Ba".ik, 17 'li'-':::7' 4-"high x3
Right
II
Main Rcln.Y.
11
Rectjfier Unitw 4'0
1
x_5
0"high X2'0' deep
1
1D1\ilocp, 4 tons.
4 tons.
7 cwt.
5 cwt.
21. DIMMER ROOM CONSTRUCTION: No.turn.l ventilation it some cross
draught
of
oan extract fan brought in by a thermostat, is desiro.ble in which
can be encouro.ged ms.y be sufficient. Alternatively, n. fan
the Vent-Axia type will be eff ective. On large installations
•. i"\\
·, .·.;., ......
· case air filter inlets may be advisable• Co.re should be taken
that the room is reasonn.b]y soundproof, the prinoipo.l source of
noise being the larger wattage contactors and the m::itor speed
oont~ctors.
No special treatment or soundproofing ho.s been
recpired in aI:\Y installation yet.
A good washnble paint to th e walls and an anti-dust finish to ·the
floor
is advisnble in order to reduce the amount of cleaning
required. The door t o the room mlSt be ~:::cpt loc ~ced to prevent
unauthorised access.
-cont'd-
-16-
22. ACCEPrANCE TESTS: Lightmg dimmer banks will be erected
and wired at our Works to the control desk. It will there-
fore be possible t o
It will not
of lighting due to
current required. Dimmers will be tested individuo.l]y by us
before mounting on ba...1'J.lcs~ '\Th.en mounteu they will be re-tested
singly in the presence of BBC engineers if desired.
The 11patching
works but will only be portly connected there in respect of
the main cable in ordc:"' ·Lo so.ve unnecessary repetitive work.
be possible to loa.d the dimmer bnriks in respect
11
wiring will a.11 be .mn.de up am preformed at our
opern.to same before re-erection on site,
the non· -st l.'tndnrd voltage and hel.'tvy
23 • TRAINING OF OPpi A.'rO'.l AND l,lAINTE.li[ANCE. The customer's own
operator
construction in order to
apparatus, its testing, maintero.nce o.nd operation. Our own
may attend a.tour Works during the last week of
go.in an inside knowledge of the
operator attends
actually working in the stiidio, to operate the 11.ghting and
train opcro.tors.
Contracts for regular mn.irr~c~1...'U1.ce o.nd clen....'llrlg of the apparatus
oan be entered upon ..
A
complete set of vdring din.grams, together vdth a description
of the
suggestions for maintenance n.nd test arc supplied on completion
of the installation. (20 such copies have been included for).
way the various circuits work, how to work them an:1
duri :r..g the f irst two weeks the equipment is
24. VARIATIONS FROM B.B .c. TEJ3NICAL CONDITIONS OF CONTRAaI' III.
( 1) Dirrmer Banks will be constructed. o.s standard
Strn.nd pro.cticc
dead fr ont (all live metal screened) in respect
and are only orro.nged to be
'·
of the end
relnyo Ba.nks
open port of the framework cn.r~Jing the dimmers
1:;uslnr chrunbers, fuse and patching
will be so constructed that the
room
ca.n f orm a. sepnra.te part of the d~-nmer/screenel
by nosh a.nd ga.te with Castell key int erlocks.
-cont•a-
.r, ...
This protection does not form po.rt of this oontro.ct.
Outside the protectc<l o.rcn o.11 live 1mto.l n.bovc 50
volts
requiring nt lenst three screYvs to m10ovcr. i7arning
lnbels
(see 20 (g) above) will not .be mounted. behind covers
as rcru3y ncocss is essential to working of the
studio
an enclosure pre'lenting uno.uthorised or untrained
o..caess.
will be sorccnca. by metal covers and guards
will be f i.xcd to all such covers. Fuses
rurl tho vrhole ditmcr room should constitute
(2) Due to the lo.rge nuniber of meohanico.l contl' actor
switches n.nd rclnys required by the specification,
the a~Jar atus will be so.mawhnt noisy an:l the room
walls should be constructed with this :1n mind. For
s:i.milo.r reusons we oo.nnot gunro.ntec this apparatus
to be free of electric interforonce in respect of
your brooclcn.sting equipment but ore prcpn.red to
co-opcro.tc vdth B.n.c. :&lginccrs in tests o.t an;y
London Thco.trc i7hcrc similo.r apparatus is installed..
(5) The two indicnting meters on the desk for prcset
changeover
equipment; i.e. Measuring Instrwn cnts Pullin, 2}
inch dinl Series 25 square flush voltmeter.
(7 }Finish: Control desk nnin fro.roo will be finished
o.s required in high grnde finish B.B.c. grey. (ED.24)
Dittmer lever inserts will be standard pale cream
engraved. as described in our desk schedules above.
Other exposed. n)9to.l with fixing sorews finished black,
will be the struic1nrd used on this type of
"··.
bronze or plo.tcd o.s o.pplioo.ble.
Main
relcy: See Specification 19 above for finish.
Dimmer Banks: Stan:lo.rcl. Strru'Jd Electric f:inish
including o.11 iron f'rruncvrork po.intcd red oxide under-
coat o.nd one cont semi gloss I.a.I. Rudio Grey.
An extra coot to be brush applied a.fter erection on site •
....cont' d-
-18-
Sheet iron panel covers to be one coot red oxi de
and one con.t hn.mncr erey stovea.. Trunk:ines and. bus-
bn.r chruribers
of len.d coated steel finished red
oxide undercoat o.nrl staved h."l'ITi".le',C'
r,rey top coct. HalmrD:v grey to nntch Radio grey as
near as pass ible., Fuse panels to be semi-gloss bla.ok
Pierrite grade c.o,. Fixing studs am nuts covered by
black moulded caps.. All steel dimmer and clutch bolts,
split pins,
washers, etc. cn.d.mium plated. Magnet
pole pieces rust proofed5 Dimmer clutches and collars
in natural die cast aluminiwn finish. Dimmer fram3s an:!.
arms in natural ~.fu.zn.k 3 ..
(8) Spores: The following items . will be supplied as spores.
Ma.in d:i.rnrrer bank Telan.otor - 1.
Mam Rectifier transformer unit - 1.
Sunset R
s istanoe d:imme.r 1000/2000 w. - 1.
6
500/1000 w. - 1.
Stram Phoe-1:ix T:..unsfor:rrer d:L.'1llrer - 1.
CJ.ul:;ch Magnet ooi:Ls - 6.
II
Suppress ors - 6.
PotentioIIDte:c strips 1 OOO ohm - 36.
II
II
wire brushes - 36.
carbon brushes - 36.
Sunset dimmer carbon brushes - 12.
II
Transformer d:imner brushes
Fuse cartridges
20 aJl1_J G/S relay - 6.
II
contacts complete - 1 gi:-oss.
- 36.
~
af all size,::i mi.n:uwm 2·
24-NB.Y wir~ cont act relay - 6.
c/o, & Sust. wire ccnfa.c ·~ relay •• 6f
Ji?.R. relay - 2.
Burgess Micro switches - 3.
Luminous pushes - 2.
Lamps for Luminous pushes - ,-. I~
J?atoh selector swifohes - 2.
-continued-
-19-
(10) Tcehnico.l Inforrrntion: Mo.intemnce Instructions
ci:rouit
the Control ho.ndbook o.n:1 nrG supplioo on comp let ion
of the :installation. (20 oopies).
(ll) (a) Dimmer Bank lo.bels will bJ;>, of tro:f'folitc
coloured to correspond with the control key colour.
Iho.sing of d:i.mmcrs is ind.ico.ted by colour po.inting
their mounting feet.
(b) Co.bles entries will be arranged as convenient
to suit the
descriptions o.:ru;1 diagrams form part of
exterml wiring run building ln.yout.
(12) Ni".n.teric.~ quality: Attention is drawn to the fact
the short delivery time aUmvod o.nd the
that
sto.t c
of the Il1!1I'kct does not permit us to submit
components for B.B.01t o.pprovo.1. The equipment
supplicc1
by us will be of first clo.ss nnnufo.cture
ani in our opinion m:,re than a.dequn.te for the
cl.ass of work, we sho.11 comply with the sto.ndn.rd
B.B.c. cor:ditions an1 specitications as far o.s
possible under the oirournsto.nc~s.
R & D.;FPB/2/8/1955•
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