Page 1
BELL SYSTEM PRACTICES SECTION 501-136-100
AT&TC o Standard Issue 7, November 1979
STATION TRANSFORMERS
IDENTIFICATION
1 GENERAL unit to be i n close proximit y to the
1 . 01 This section contains information on station
transformers. 1.03 Locate transformers where they will be
1 .02 This section is reissued to:
. Show KS-20426L3 transformer MD a 110- to 125-volt ac power service outlet.
• R evise Table A . _ Make sure that pow e r servic e outIet
Danger: When providing power for
illumin a t e d station sets , two or more
transformers should never feed the
same inside wiring pair . If one 1 .05 To p reve n t a ccid e n ta l re mo va l, powe r co r d s
transformer is unplugged while the may be fastened to the ac outlet with a
s e condary t e r m inals o f that transform e r power - cord plug - retainer assembly (Section 167 - 400 - 210)
are b e ing e nergiz e d through th e inside and plug - in transformers may be secured with a
wiring, by another transform e r , the clamp. A clamp is furnished with some of the
e xpos e d t e rm in a l blad es of t h e KS - 20426L3 (MD) transformers , others have a
unplu gg e d t r ansfo r m e r would b e molded mounting tab. A retaining clamp is available
e nergiz e d with 110 to 125 volts a c . for the 85B1 and 95B1 power units. The 2012 - type
Installations of m ultipl e transforme r s transformer may be secured with a 2A clamp.
conn e ct e d to t h e sam e insid e wi r ing
pai r sh ould b e avoid e d and co rr e ct e d
if encount e red in t he fi e ld . 1.06 The B cord clip (size 1) provides a means
Wa r ning: Ca r e sh ould b e tak e n to pulled from the transformer screw terminals.
strip and d r e ss l e ad s conn e cting to
Io w volt age output t erm in a I s of
t r ansfo r m e rs and power unit to assure 1.0 7 The B cord clips come 10 to a package and
that inadvert e nt connection to conducting should be ordered as follows:
surfaces or other power source does
not occur . I f more than one transformer 1 pa c ka g e (1 0 clip s per p a c kage )-- C lip, C o r d,
or power unit is plugged into a multiple B 1- 6 1.
receptacle power strip , there must
be at least one inch separation
between them . Only UL listed 1 .08 R e mo ve p r o te c t i ve p a p er f r om a dh es i ve of
receptacle power strips with adequate B co r d clip a nd st ic k clip t o bo tt om of stat ion
power rating shaH be used . Use of tra n s fo r m ers as s hown in F i g . 3 . T er min ate D
a continuous terminal power strip stat ion wi re on s c re w term in a l s of 2 01 2 - t yp e
that allows the secondary output tra n sf o r m er a nd hoo k stat ion wi re t h r ough B co r d
terminals o f the transformer or power cli p as s hown in F ig. 3 .
a c line source is not recommended .
accessible for inspection and maintenance.
1 .04 Transformers discussed in this section require
is not under control of a switch .
of attaching D station wire to station
transformers to prevent the wire being accidentally
Not for use or disclosure outside the
Bell System except under written agreement
NOTICE
Printed in U.S.A. Page 1
Page 2
SECTION 501 - 136-100
2A clamp with 2012 - t y pe
transformers having folded bl a de
t y pe prongs wiIl no rma ll y not be
ne c ess a ry .
_iiiiii_i_iiiiiiiiiiiiiiii_i_i_i_iii_ii_i_iii_i_i_i_iiii_:i!ii:iiii_ii_ii!iiii_iii_iii_iiiiiiiiiiiiiiiiii_iiiiiiiii_
FO L DED B L AD E SOLID
TRANSFORMER PRONGS PRONGS
2012A 2A CLAMP
Fig. 2 -- 2012-T y pe T ransformer, Prongs
Fig . 1 -- 2A Clamp
2. 2012-TYP E T RANSFORM E R
D ang e r : Fo r saf e t y , s e cu r e l y att a ch
retaining clamp to a c outlet using outlet "s_" S Z ATiON
cov er sc re w BEFORE a ttempting to inst a ll w_R__
2012 - t y p e tr a ns f or m e r. Se e Fig . 1 . When
r emoving 2012 - t y pe trans f o r mer alwa y s
unplug unit co m pI e t e I y f ro m outl e t BEFORE
attempting to remove the retaining cIamp .
This wilI p re v e nt the possibilit y o f a loosened
r e t a ine r clamp or me tallic outlet cov e r .....
making contact with the a c prongs of the
2012 - type transformer when partially
withdr a wn from outlet . Do not use 2A
cla m p or simil a r retaining clamp on outlets
where cover mounting screw holds the .....
k
duplex outlet in the box . :: \
2 . 01 A 2A clamp may b e used to secure the "\, ............ .... 2o_2-Tv : _ : \
2 0 12-type transformer to a standard electrical _' _:' CORD CL_P TRANSFORMER
service outlet (Fig. 1) in those locations where the
transformer is subject to being accidentally dislodged
f rom t h e receptacle. F i g. 3 -- Cord Clip Used to Sec u re Station Wire to
T ransformer
Page 2
aft e r Ap r il 1969 have folded bl a de - t y pe
prongs (Fi g. 2), which h a v e imp r ov e d
The 2012 - type t ra nsfo r mers manufactu r ed
retaining char a cteristics . Use of the
Page 3
ISS 7, S E C T ION 501-136-100
2. 02 The 2A clamp is available in Light Olive TOUCH-A-MATIC 16 telephone sets, and the 55A
Gray (-49) and Ivory (-50). or 55B control unit in 3-type (MD) speakerphone
A . 2012A ( MD) o r 2012C T ransformer or Ivory ( - 50). The length of wire between the
sets pe r r esidence along with one
PRINCES S _ telephone set may be __ Do not use 2012B or 2012D tr a ns fo r mer
An y nu m b er of TRIMLINE _ t e l e phon e 100 feet of standard inside wire.
transfo r mer . However, onl y one
powered f r om one 2012A or 2012C _ i n pl a ce of a 2012. 4 o r 2012C W a ns forme r.
PRINCESS telephone set c a n be
connected to a 2012A or 2012C
t r ansfo rm e r . When in s talling 2 . 10 Prongs for the primary terminals are provided
multiple PRINCESS sets use so that the transformer can be mounted in
KS - 20426L3 t r ansfo r me r o r p r ovid e a standard parallel - blade convenience receptacle.
an additional 2012A o r 2012C Screw terminals are provided for secondary winding
transformer f or each telephone in a recess on the same side of apparatus as the
s e t . prongs.
2 . 03 The 2012C is equivalent to and a direct 2 . 11 With 115 volts, 60 Hz applied to the primary
replacement for the 2012A (MD) transformer, winding , the secondary delivers approximately
2 .0 4 The 2012A or 2012C (Fig. 4 or 6) transformer
supplies power for telephone sets with dial 2 . 12 A sustained short circuit across the secondary
night light feature and is available in Light Olive of the 2012D for 10 to 15 minutes will cause
Gray (-49) or Ivory (-50). the transformer to go open and remain that way.
to power 3 - type (MD) speakerphone
systems or TO UCH - A - MA TIC _ 1 6 2. 1 3 The 2012D transformer will be manufactured
Do not use 2012. 4 or 2012C transformer transformer o verheating.
telephone sets . with back plates in a contrasting color from
2 .0 5 Prongs for the primary terminals are provided in preventing mixing and misuse with 2012A and
so that transformer can be mounted in a 2012C transformers.
standard parallel - blade convenience receptacle.
Screw terminals are provided for secondary winding
in a recess on the same side of apparatus as the
systems and is available in Light Olive Gray (-49)
transformer and the control unit should not exceed
17 volts at 0.132 amp.
This is a self-protecting fail safe feature to prevent
the case. The visual difference is provided to aid
prongs. _: _:,
2 . 06 With ll5-volts, 60 Hz applied to the primary ii_ii _i_,_,_i_i_i_iii ? iiii_ii ? F_,_ii_ i
winding, the secondary winding delivers _ :_i_
approximately 7 volts at 0.250 amp. _ ii
2 . 07 A 25 - foot telephone set mounting cord is not !il i_
recommended because the added resistance _ .... ............................
of this cord results in decreased illumination.
B. 2012B (MD) or 2012D T ransformer Fig. 4 -- 2012A Tr ansformer
2. 08 The 2012D is equivalent to and a direct
replacement for the 2012B transformer. 3 . KS-16886L2 T RANSFORM E R
2 .0 9 The 2012B or 2012D transformer (Fig. 5 or 3 .0 1 The KS-16886L2 transformer (Fig. 8) is
7) is intended to supply power to primarily intended as the centralized power
Page 3
Page 4
SECTION 501 - 136-100
4 :1 : ::_'?:::J:_I!J::N _i _Ji_i _ :
Fig. 5 -- 2012B T ransformer
Fig . 6 -- 2012C T ransformer power 3 0 dial light telephone sets.
..... .. .......
Fig. 7 -- 2012D Transformer
i ns t an ce s whe r e fre que n t custome r
co n t a ct may r e s ult i n sho r t ci r cuits
th a t w ill a ff e ct s e r vice , the
tr a ns f ormer m a y be mounted in
a 105C (pl a stic) a pp a r a tus box .
4. KS-16940L1 VOL T AG E R E GULATING ( V . R . )
TRANSFORM E R
4 . 01 KS - 16940L1 V.R. transformer (Fig. 9) is
primarily for use as centralized dial light
power source to provide regulated power for dial
lights and night lights on telephones. It will
supply for multiphone dial light installations and power cord and plug. The ground prong
4.0 2 Input is provided with a 2 - foot 3 - conductor
home interphone systems requiring approximately of the plug is connected internally to the transformer
6 volts. It is capable of handling up to ten dial case. The output is isolated from the input and
light stations. Additional taps at 10.5, 24.0, and the case and is ter m inated in two low voltage
25.5 volts are also provided for other possible uses. terminals on the case.
This transformer is self - protecting with an automatic
reset thermo switch. 4.03 Output taps of 6.3 and 8.0 volts are located
onback of cover as shown in Fig. 10. The
3 .0 2 Overall dimensions of the transformer are transformer is shipped with movable lead connected
2 - 3 / 4 by 3 - 3 / 4 by 2 - 3 / 4 inches. Power cord to 6.3-volt tap.
is 18 inches long and terminates in a 2 - pronged
plug. Weight is approximately 1 - 1 / 2 pounds. 4.04 The 8 - volt tap should be used to provide
illumination for PRINC E SS telephone sets.
3.03 Keyhole slots provide easy installation. Use
a suitable backboard when mounting on 4.0 5 To change connection to 8.0 - volt tap.
surfaces requiring backboards.
(1) Remove plug from power outlet, if connected.
n ot h a z a rdous a nd short circuits a cross (2) Remove t wo screws ho lding cover to case.
th e se ter m inals will not damag e th e
The exposed low - voltage terminals are
KS - 16886L2 trans f or m er . However in (3) Remove cover.
Page 4
Page 5
ISS 7, SEC T ION 501-136-100
I b T A BLE A (I
TRANSFORMER APP L ICATIO N (NOTE 1)
TRANSF O RMER APPLI C ATION PARA G RAPH NO.
2012A(MD ) For dial l ight in the TRIMLINE teleph o ne set. F o r dial-night light 2.03 thru 2.07
or 2012C in the PRINCESS telephone set.
2012B (MD) Power supply for TOUCH-A-MATIC 16 telephone set, and for 55A or 2.08 thru 2.13
or 2012D 55B control unit in 3-type (MD) speakerphone system
KS-16886L2 home interphone systems requiring approximately 6 volts, capable 3.01 thru 3.03
KS-16940L1 For centralized regulated power supply for up to 30 dial and night 4.01 thru 4.07
KS-20426L3 (MD) For centralized power supply mounted in a 2-wire receptacle, wi l l 5.01 thru 5.04
(Note 2) power five dial light telephone sets
2075A Supplies power (15 to 18 volts) for the 41A dial in 660-, 662-, 663-, 8.01 thru 8.03
2186A (MD) Supplies power for the 700A and 700B subscriber sets 9.01 thru 9 06
or 2189A
KS-5714-Type To operate bells, buzzers, and lamps on station systems when the
(MD) circuits are arranged to supply this load separately 10.01 thru 10.03
KS-21239L6 To furnish power for the 24A-type line status indicator 11.01 thru 11.03
85B1 Power unit To furnish ac power for the 4A speakerphone system 12.01 thru 12.03
95B1 Power unit To furnish power for the TOUCH-A-MATIC 32 telephone set 13.01 thru 13.03
Note 1 " These transformers are to be used only for the application indicated in this table. Do not substitute one trans-
former for another.
Note 2 " Do not use the KS-20426L3(MD) transformer manufactured byAult Inc. Use only theKS-20426L3(MD)
manufa c tured by other suppliers.
For centralized power supply for multiphone dial light installations and
of handling up to ten dial light stations
lights in telephone sets
and 664-type telephone sets
(4) Change movable lead from 6.3 - volt tap to 5 . KS-20426L3 (MD) ( FIG . 12) T RANSFORM E R
8.0-v01t tap.
4 . 06 Overall d i mens io ns of the transf o rmer are t r ans f o rm e r s manufactu r ed by A ULT,
7 - 5 / 8 by 2 - 15 / 16 by 3 - 5 / 8 inches. The weight INC., are being recovered from the
is approximately 5 - 1 / 2 pounds, field . The tr a nsformers should be
4 . 07 Four 1 / 4 - inch holes are provided o n the case p r emise s vi s it (install a tion, r epai r
for mounting. Use a suitable backboard modula r conve r sion activit y , etc . ) and
for mounting on surfaces requiring backboards, r etu r ned without d e l ay to the local
co r d into a p ar allel - bl a de ac outlet SHOULD NOT be unplugged a nd then
which does not h a ve a g r ounded plugged b a ck into the a ssoci a ted a c
An a dapte r is needed to plug powe r (MD) (AULT) t ra n s fo r me r , the unit
r ecept a ble to accommodate a th r ee powe r outlet, since the s t a bility o f
p r ong plug . The spade - tipp e d the t ra n sf o rm e r could be aff ected by
wire on the adapter should be such action . See Fig . 11 f or the
connected to the outlet plate manufacturer's identi f ication marking
screw . Do not cut o ff the ground on the trans f ormer . This recovery
prong on plug . plan does not apply to A ULT, INC . ,
Dange r : All KS - 20426L3 (MD)
located a nd recovered on a ny customer
W e ste r n El e ct r ic Se r vic e Cente r. Wh e n
r emoving and r eplacing the KS - 20426L3
Page 5
Page 6
SECTION 501 - 136-100
Fig. 8 -- K S -16886L2 Transformer
Yi_:ii_,!!_i!iiiiFiiiiiJiiii iii iiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiii!iiiiii_,iiiiiiii,_i KS - 20426L1 (MD) tr a nsformer or the
manufactured b y other suppliers .
ii_ii!iiii t 5.01 The KS - 20426L3 trans f ormer (F i g. 1 2) (n o t
_ for use in light systems and is mounted in a 2-wire
__ receptacle, p o wer lig h t telep ho ne
_ sets.
manufacturedit will by AULT , five dialINC') is intended
1 L_
CASE 2 5-6 25.5V J25A
CASE $ L 3---6 .IA
B_ ' ._O_ ; N_i_N & C _ . ! "": - .............
OUTPUT 6. 3 v
Fig . 10 Movable Lead Co nne cted to 8 - Volt Tap,
KS-16940L1 V.R . Tra n sformer With Cover
Open
i;::i 5 . 02 T h e trans f ormer is sel f- protecting with an
automatic thermo switch and is provided
with primary terminals in the form of parallel
.................. hold the transformer securely in the receptacle.
i blades which serve as the mounting device. If
- " " D a nger: For s a fety, securel y a tt a ch
__ furnished, the clamp (Fig. 1 3) must be used to
r et a ining eI am p to a c outlet using
outlet cove r sc r e w BEFORE a tt e mpting
Fig. 9 -- KS-16940L1 V.R. T ransformer to inst a ll transformer . See Fi g . 13 .
When removing tr a nsformer, a lw a ys
unplu g the power unit completely f rom
t he outlet BEFORE a ttemptin g to
Page 6
Page 7
ISS 7, SECTION 501-136-100
KS-2042 6 L3 T RNS F _ I
_ DE BY AU L T, IN C.
FO R WE ST E RN ELEC TR IC _ 1(_
10 5- 12 9 V 60 H z
S EC: 5 .7 8 -7.3V
5.5VA CLASS 2
j l SE C : S 76 -_.Sv
Fig. 11 KS-20426L3 (MD) Transformer Manufactured
5.03 Some transformers are provided with a
transformer securely in the receptacle by using
the outlet cover screw. See Fig. 14.
by AULT, INC.
Fig. 12--KS-20426L3 (MD) Transformer Not Manufactured
r emove th e r e t a ining cl a mp . This by AULT, INC.
will prevent the possibility of a loosened
r et a ine r cl a mp o r m e tallic outI e t cov e r
m a king contact with the a c p r ongs
of the t r ansfo rm e r w hen p ar ti a Il y
w ithd r a w n f r om outl e t . Do n ot u s e
t r ansfo r me r r et a ining cIa m ps o n outlets
w he r e t h e cove r mounting sc r ew h olds
th e duple x outlet i n t h e bo x.
mounting tab which is used to hold the
t _a
F T R NS F 2 0 426
J WADE BY .......
J FOR I EST E RN ELECTRIC
/ 105 - 129V 60 HZ
L,, S.SVA CLASS 2
" I@
J
J
Danger: Do not use a KS - 20426L3
(MD) transformer equipped with a
mounting tab if ac outlet has a m e tal
cov e r o r if c e nt e r cov e r m ounting
sc r e w hoIds th e duplex outlet in the
bo x .
5. 04 Recessed screw-type secondary terminals are Fi g . 13--Clam p f or Mount i ng Early Vers i on KS-20426L3
provided on the same side of the apparatus (MD) Transformer N ot Equipped With Molded
as the primary terminals. With 115 volts, 60 Hz Mounting Tab
applied to the primary winding , the secondary
winding delivers approximately 6.38 volts at 750
milliamperes.
Page 7
Page 8
SECTION 501 - 136-100
Fig. 14 -- KS-20426 T y pe ( MD) T ransformer E quipped With Molded Mounting Tab
6. L E NG T HS OF FE E D E R PAIRS Illumination should be to the customer's satisfaction.
6.01 Table B is to be used as a guide only. After 7 . MUL T IPL E INS T ALLA T IONS
the installation of equipment is made , if
illumination is reported as inadequate , then it must C a ut i on: Do not e x cee d th e ra t e d
be assumed that the lengths of feeder pairs have I am p Io a d o f t he t ra n s fo rmer b e i ng
been exceeded, or too many stations have been ins t a ll e d ( see T a bl e B) .
off-hook at one time. To remedy this situation do
one of the following: 7 .0 1 When a transformer is installed to illuminate
• Double up on the transformer feeder pairs be used to multiple the transformer feeder pairs.
• Split the lamp load by adding a second depends upon the number of lamps to be illuminated
transformer, and their location relative to that of the transformer.
D a n g er: When pro v idin g power f or 8. 2075A T RANSFORM E R
illumin a ted st a tion sets, two or more
tr a ns f ormers shouId never f eed the 8.01 The 2075A transformer (Fig. 15) supplies
same inside wiring pair. Installations p o wer (15 to 18 volts) for the 41A dial in
o f m ultipIe transformers connect e d to the 660 - , 662 - , 663 - , and 664 - type telephone sets.
th e s a m e inside wi r ing pair should
be avoided and corrected i f encountered 8 .02 The transformer is equipped with an 18 - inch
i n the f ield , power cord terminated in a 2 - pronged plug.
Page 8
more than one lamp , connecting blocks may
The number and type of connecting blocks required
Page 9
ISS 7, S E C T ION 501-136-100
S TABLE B Q This plug fits a standard parallel-blade convenience
DIAL LIGHT
receptacle.
TRANSFORMER LIMITATION 8.03 Keyhole slots are provided at the rear of
the transformer for each installation. Use
TRAN S F O RMER S MA X IM U M N U MBER OF a suitable backboard when mounting on surfaces
(N O TE 1) DIAL LIGHT TEL SETS requiring backboards.
2012A or 2012C
See Note 2 9. 2186A (MD) OR 2189A T RANSFORM E R
and Part 2 9.01 The 2189A is a recommended replacement
for the 2186A (MD) transformer.
KS-20426L3 (MD) 5
9.0 2 These transformers (Fig. 16 and 17) supply
KS-16886L2* 10 power for the 700A and 700B subscriber
. . sets.
KS-16940Ll* 30
Note 1: Do not use common feeder where
more than two sets may be dialed at the
same time. Home runs from each set to
the transformer provide best illumination. ::_::
Illumination should be to customers _:_i:
satisfaction. _, _## i!:
_s _ _ ,,_ c_, ::::_::_ii'
:,_iij
Note 2: Any number of incandescent :_ ¢ _ ' _: :i: ; :_ : iii!
TRIMLINE telephone sets per residence i:_: _ .... _ _ _ , _ . _ : : :i_iii
along with one PRINCESS telephone set _ _:_,_:z : :_:ii!
may be powered from one 2012A or 2012C c _ .......
transformer. However, no more than one S ; _'_:_!_' / _'_S::: ..... J ,,J:_S:_:::
PRINCESS telephone set can be connected . : _::: / ...........
v .... _ _ . :_:..
to a 2012A or 2012C transformer. ..........
*Not recommended for single telephone
: ....... . : :( f'::
installations. ...... _ ii !i!! !! !i ! i i !!i i! I !ii!
.... i
N
"_ 9.03 These transformers are protected by an
................ : _ restores automatically. They are equipped with a
connected to the primary winding. The secondary
Fig. 15 -- 20 7 5A T ransformer w i nd i ng is terminated in screw terminals on the
Fig. 16 -- 2186A (MD) Transformer
internal thermal overload safety switch which
12-inch (2186A) or ll-inch (2189A) power cord
rear of the transformer.
Page 9
Page 10
SECTION 501 - 136-1 O0
_JiiJ_iiiiiiiiiii_iiiii_iiiiiiiiiiiiiii_iiiiiiiiiiii_iiiii!iiiiiiiiiiiiiy_iiiiiiJijJJi!ii!iJi_i_!_iii_
_ g2 ¢ 2
Fig. 17 -- 2189A Transformer
9 . 04 With 117 volts, 60 Hz applied to the primary
winding , the secondary delivers approximately
20 volts at 0.345 amp.
9 .0 5 Keyho l e s l ots are provided at the rear of
the transformer for mounting purposes.
Use the backboard furnished with the transformer
on surfaces requiring backboards.
9 .0 6 Attach backboard with appropriate fastening
device depending on the type of mounting
surface.
10. KS-571 4 TYPE (MD) TRANSFORMER
10.01 The KS-5714 type transformer is used
primarily to operate bells, buzzers, and
lamps on station systems when the circuits are
arranged to supply this load separately. It is
furnished in a metal box with a removable cover.
The box is approximately 8-3 / 4 inches long , 4-3 / 8
inches high , and 4 inches deep, and is arranged SCREW TERMINALS
for wall mounting. This transformer is self-protecting FOR POWER OUTPUT
and has no fuses.
10.02 The KS-5714L4 transformer supplies 15-volts
at 2.2 amps.
1 0.03 The KS-5714L5transformersupplies15-volts screw-type secondary terminals are provided on
at 1.1 amps. the same side of the transformer as the primary
11. KS-21239L6 TRANSFORMER
11 .0 1 The KS-21239L6 transformer (Fig. 18) is mounting tab which is used to hold the
used to furnish power for the 24A-type line transformer securely in the receptacle by using
status indicator, the outlet cover screw.
11 . 02 The transformer is self - protecting with an D a n g er: Do not use a KS - 21239L6
automatic thermo switch and is provided t ra n s fo r m e r e quipp e d with a mounting
with primary ter m inals in the form of parallel tab if ac outl e t h as a m e t a l cov e r
Page 10
blades which serve as the mounting means. Recessed
terminals. Refer to Fig. 18 for electrical specifications.
11.03 Some transformers are provided with a
Fig. 18 -- KS-21239L6 Transformer
Page 11
ISS 7, S E CTION 501-136-100
o r if c ent er cov e r mountin g sc r e w the 85B1 power unit where additional mounting
holds t he dupl e x outl e t in th e box . strength is needed, see Fig. 20.
12. 85B1 POWER UNIT (FIG. 19)
Warning: C a re should be t a ken to
t r im an d d r e ss I e a ds conn e cting to i
lo w volta g e output o f 85B1 po w e r I
unit to assu r e th a t in a dvert e nt I
connections to conducting sur f aces or i!
other power source does not o c cur .
W a rning: If more than one 85B1 i
a ndor 95B1 power unit is plugged i
into a multiple receptacle power strip
there must be a t le a st one inch !
separation between the power units . _
B e su r e the r ec e ptacle pow e r strip
is UL Iist e d and r at e d suffici e ntl y
fo r the numb e r of powe r units plugg e d
in . Use of a continuous terminal
power strip th a t allows the secondary
output terminals o f the tr a nsformer
to be in close proximity to the a c line
source is not recommended .
12.01 The 85B1 power unit is used to furnish ac
power for the 4A speakerphone system. Fig. 20 m 841050818 Retaining Clamp Mo u nted on
Available in Light Olive Gray ( - 49) only. AC O u tlet Box Using O u tlet Cover Mo u nting
"" I i
Screw
_ i!!i!!iii!_iiiiiiiii##_i_,!ii . _ 12.0 3 With a line voltage of 105 to 129 volts ,
_!iiii_ii_iii_iii!i_!iiiii!i}i!i!_ii_iiiiii_!!iii_i_ii_!!iiii_!i_i_iii_ / _ii_ii_!_i_i_i_ii _ii i_: of 17.5 volts minimum with a current load of 0.200
!i ii!iiiiiiil iil ili!i i t_f ' 75 :i_ : i ampere. When used t o power a system one 85B1 power unit is required with each 4A speakerphone.
i! 60 Ha, the power unit provides an ac output
Fig. 19-- 85B1 Power Unit 21. When removing 85B1 power unit,
12 .0 2 The ac inpu t to t he uni t is by means of to remove the r e taining cla m p . This
two parallel blade s for u s e in a s t andard will pr e v e nt the possibility o f a loosen e d
t wo wire recep t acle which serves as the moun t ing retainer cla m p or m etallic outlet cover
device. The ac output is available through screw making contact with the a c prongs
terminals recessed in the plastic case. A retaining o f the 85B1 powe r unit wh e n p ar ti a ll y
clamp (841050818) can be obtained for use with withdrawn from outl e t . Do not use
D a nger: For safet y , securely attach
retaining clamp to ac outlet using
outlet cover screw BEFORE attempting
to inst a ll 85B1 power unit. See Fig .
alwa y s unplug t h e power unit co m pletely
fr o m the outlet BEFORE attempting
Page 11
Page 12
SECTION 501 - 136-100
in 841050818 o r simil ar r et a ining 13.03 With a line voltage of 105 to 129 volts,
el am ps o n outl e ts wh ere t he c ov er 60 Hz , the power unit provides an ac output
mounting screw holds the duplex outlet of 13.0 volts minimum with a current load of 0.250
in t h e box. ampere. When used to power the TOUCH - A - MATIC
13 . 95B1 POW E R UNI T ( FIG . 21) unit is required with each TOUCH-A - MATIC 32
Warning: C a re should be t a ken to
t r i m a nd d r e ss le a d s conne c tin g to
low volt ag e output of 9 5 B1 pow e r D a nger: Fo r s a fet y , securely a tt a ch
unit to ass u re th a t in a dve r ent r et a ining e / am p to ac outlet u s ing
connections to conducting surfaces or outlet cover screw BEFORE attempting
other pow er source does not oecu r, to inst all 9 5 B1 pow e r unit . Se e Fi g.
W a rning: I f mo r e th a n one 9 5 B1 a lw ay s unplu g the pow e r unit eo m plet e l y
a ndo r 8 5 B1 powe r unit is plu gg ed f r om the outIet BEFORE a tte m pting
into a multiple receptacle power strip to remove t h e retaining clamp . This
there must be at least one inch will prevent t h e possibility of a loosened
separation between the power units , retainer clamp or metallic outlet cover
Be sure the receptacle power strip making contact with the ac prongs
is UL listed and rated su ff iciently o f the 9 5 B1 power unit when partially
f or the number o f power units plugged withdrawn f rom outlet . Do not use
in . Use o f a c ontinuous terminal in 841050818 or similar retaining
power strip that a llows the secondary clamps on outlets where the cover
output terminals o f the trans f ormer mounting screw holds the duplex outlet
to be in close proximity to the ac line in the box .
source is not recommended .
32 telephone set power supply one 95B1 power
telephone set.
20 . Wh e n r emoving 9 5 B1 powe r unit,
set. Available in Light Olive Gray ( - 49) only.
o ower unt s use to urniS te e oneaC ..................................................................... ................................................................................
13.02 The ac input to the unit is by means of i
two parallel blades for use in a standard
two wire receptacle which serves as the mounting
device. The ac output is available through screw
terminals recessed in the plastic case. A retaining
clamp (84105818) is available for use with the 95B1
power unit where additional m o unting strength is Fig. 21--95B1 Powe r Unit
needed, see Fig. 20.
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12 Pages