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Overview
From the Kiosk No. 3 onwards, all the kiosk range had internal lighting. Originally
this was achieved with a 25 watt bayonet bulb fitted in a brass, batten
style, light fitting. This lamp fitting had a special ring which would
only release the bulb with the use of a special tool, the "Spanner, Long,
Lampholder".
Controlling the lamp
was a time switch. These could vary in nature from a simple on/off
type to the GPO Venner time switch. The correct position for these was
under the board board and to the left. The electrical intake would
generally be to the right. In some areas the time switch has been
located in other positions, one of them being at the top of the back board!
By the 1960's most of the time switches were installed in a Cases, Time Switch, No. 2
(Drawing - P/EL 538),
which would have a Time-switch No. 2 and Solar Dial No. 2 fitted within. The time switch was interesting as it had a solar dial that could
be easily changed. The GPO used 9 different Solar Dials depending on
the location of the kiosk. The Solar Dial switched the light off half
an hour before sunrise and on hour an hour after sunset taking into account
the month of the year. The Solar Dials were labelled A to K and their
locations are show below.
The box containing the Venner time switch was lockable with a
special key and on the right hand side, on early boxes, there was a non-lockable toggle switch for
testing the light. This switch can be seen to the top right of the
picture below.
There were two variants of Solar Dial, the No. 1 and No. 2. Solar Dial
No. 1 fitted a Time-switch No. 1 and the Solar Dial No. 2 fitted the
Time-switch No. 2.
The GPO negotiated an electrical contract price for electricity and this was based
on the hours of use. There was no meter
and just a fuse box on the electrical intake cable.
In the early 1970's fluorescent fittings were installed in all Kiosks and
the time switches removed. The fuse box was then covered with a
semicircular plastic cover, coloured red. This cover and the light
cover are fixed in place by triangular headed bolts. See the article
below for more details.
At a date unknown, BT changed the electrical
installations in public kiosks to a none earthed type. Only double
insulated fittings were used after installation.
None of the P/EL diagrams appear to be available.
Electrical installation -
Power, General C3500
Lighting of Telephone call offices -
Power, Lighting A3101
Operating times of solar dials - Power, General C3502
Power supply agreements for call offices -
Power, General A0502
Provision of lighting in kiosk and cabinets -
Telephone, Call Offices A3007
Cases, Time Switch No. 1 with Solar Dial No. 1.
This time switch is fitted with the D type of
the solar dial.
The solar dial is the round calibrated object.
The solar dial is calibrated to adjust the time dependant on the month of
the year.
Picture taken in 1938 showing the Venner time switch
and incoming fuse unit.
Key No. 2 for Case, Time-Switch (Drawing - P/EL 443)
Cases, Time Switch, No. 2 with cover open.
Fitted with Solar Dial No. 1 (C type).
The lamp test switch is the lower right of the picture.
Close up of the Solar Dial No. 1 (C type)
Cases, Time Switch, No.2
Cases, Time Switch, No.2 with cover open
Solar Dial location map
TELECOMMUNICATIONS INSTRUCTION
H ACCOMMODATION
11 Lighting
E3000
Issue 1, Sept 1971
LIGHTING IN TELEPHONE KIOSKS
1 GENERAL
All new kiosks should be equipped with fluorescent lighting and all existing kiosks
converted from tungsten to fluorescent lighting as quickly as possible. The new lighting
installation is of the double insulated earth free type and the kiosks are artificially
illuminated throughout the 24 hour period.
The limited number of kiosks at present connected to time switch controlled street
lighting supplies should be considered for conversion to normal supplies, the deciding
factor being the comparison of costs between additional maintenance outside normal working
hours of the fluorescent lighting installation and capital expenditure on re-connection of
supply.
2 APPROPRIATE EQUIPMENT
2.1 Kiosks No. 2
2.1.1 Fittings EL Fluorescent No. 12A 200/220 volt or 230/250 volt.
2.1.2 Telephone Kiosk Pattress Assembly (modified in accordance with Drawing P/EL 897).
2.1.3 Guard Kiosk No. 6 Intake Power Equipment.
2.1.4 Keys for Fittings EL (to release diffuser, operate switch in pattress and secure
Guard fixing screws).
2.1.5 Fittings EL Fluorescent No. 12B 200/220 volt or 230/250 volt, to be fitted only when
vandalism is excessive.
2.2 Kiosk No. 6
2.2.1 Fittings EL Fluorescent No. 12A 200/220 volt or 230/250 volt.
2.2.2 Telephone Kiosk Pattress Assembly.
2.2.3 Guard Kiosk No. 6 Intake Power Equipment.
2.2.4 Keys for Fittings EL.
2.2.5 Fittings EL Fluorescent No. 12B 200/220 volt or 230/250 volt, to be fitted only when
vandalism is excessive.
2.3 Kiosk No. 8
2.3.1 Fittings EL Fluorescent No. 12B 200/220 volt or 230/250 volt.
2.3.2 Telephone Kiosk Pattress Assembly (modified in accordance with Drawing P/EL 878).
2.3.3 Guard Kiosk No. 8 Intake Power Equipment.
2.3.4 Keys for Fittings EL.
3 DESCRIPTION OF EQUIPMENT
Luminaires (Fittings EL Fluorescent Nos. 12A and 12B)
The luminaires are double insulated bulk head type complete with diffuser and lamp(s). The
12A has a single 8 watt 12 inch lamp and the 12B twin 8 watt 12 inch lamps.
Telephone Kiosk Pattress Assembly
The pattress is manufactured in plastic shaped to fit the kiosk roof dome, presents a flat
base for the luminaire and incorporates a double pole insulating switch. The pattress
assembly includes fuse-box, plastic conduit, cable, conduit clips and fixing screws.
Guard Kiosk No. 6 or 8, Intake Power Equipment
The Guard is manufactured in plastic and provides a mechanical protection for the
electricity supply cut-out and Post Office fuse-box.
4 INSTALLATION
4.1 General
When converting existing kiosks from tungsten lighting the Electricity Board should be
requested to disconnect the supply, remove the steel guard that may be protecting the
cut-out and disconnect any earth connection that may be obtained from the incoming supply
cable sheath. If the cut-out is too large to be accommodated beneath the new Guard Kiosk
No. 6 or 8, a request should be made to the Electricity Board to fit a smaller cut-out.
For new kiosks a connection to the main supply should be negotiated with the Electricity
Board. A connection to a time switch controlled street lighting scheme should be avoided.
4.2 Kiosk Nos. 2 and 6
Install equipment as indicated on Drawing P/EL877.
4.3 Kiosk No. 8
Install equipment as indicated on Drawing P/EL878.
5 TESTING
5.1 Insulation Resistance
The installation shall be tested initially and subsequently at 5 year intervals and on
every occasion that any part of the equipment - excluding the lamp and starter switch -
has been replaced, the insulation resistance should not be less than 10 megohms.
5.2 Sequence of testing
5.2.1 Initial Installation
5.2.1.1 Operate pattress switch to on and check continuity at cable ends of cut-out tails
with suitable tester.
5.2.1.2 Test for insulation resistance between the cut-out tails and (i) the kiosk metal,
(ii) the metal case of the luminaire and (iii) the luminaire gear tray, and also between
the metal case and the gear tray.
5.2.2 Subsequent testing
The tests should be in accordance with 5.2.1 except that the neutral be tested for zero
voltage with a voltage tester and then disconnected at the PO fuse box, the PO fuse
removed and the test applied at the outgoing circuit terminations.
6 MAINTENANCE
Lamp replacement
Lamps should be changed at periods of not more than 10 months on a planned area basis.
Component exchange
If any part of the installation requires replacement, with the exception of fuses,
lamps, starter switches or diffusers it is advisable that the entire component, pattress
assembly or luminaire, be exchanged completely.
7 COST OF PROVISION OF MAINS SUPPLY
Details in connection with limits of authority for the provision of kiosk supplies are
given in TI D5 H0017.
8 TARIFFS
Standard agreements have been arranged with all Electricity Boards for the supply of
energy to kiosks fitted with either tungsten or fluorescent lighting at fixed annual
charges.
9 CABINETS
The provision of lighting in cabinets is covered by TI E3010.
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