BS 559:1991

Committees responsible
Foreword
Specification
1 Scope
2 Definitions
3 Materials
4 Resistance to corrosion
5 Non-metallic letters or devices
6 Metallic letters or devices
7 Backing panels
8 Glass panels
9 Flat panels of plastics materials
10 Means of attachment of signs
11 Water resistance
12 Temperature rise of components
13 Switching and isolation
14 Access to high-voltage installations
15 Provision for earthing
16 Insulation resistance
17 Lamps, lampholders and auxiliaries used in low-
    voltage signs
18 Transformers
19 Invertors and convertors
20 Auxiliaries for discharge lamps
21 Capacitors
22 Flasher units
23 Bell-glasses
24 High-voltage cables and conductors
25 Supports for high-voltage luminous-discharge tubes
26 Supports for high-voltage cables and conductors
27 Connections for high-voltage cables
28 Constructional requirements for installing high-
    voltage cables
29 Radio interference suppression, harmonics and
    voltage fluctuations
Tables
1 Minimum thickness of hardwood letters or devices
2 Dimensions relating to metallic letters or devices
    formed in channel or H-section
3 Minimum thickness of wood or fibreboard backing
    panels
4 Minimum thickness of glass panels used in the
    vertical plane
5 Minimum thickness of glass panels used in planes
    other than the vertical
6 Minimum thickness of fixing clips
7 Minimum thickness of plastics panels
8 Distance between cable and conductor supports
Figures
1 Typical arrangement within an internally illuminated
    letter
2 Typical circuit incorporating a protective device in
    accordance with 18.2
3 Plan view of an electrode housing passing through a
    fascia panel
4 Recommended methods for termination of lead-alloy
    sheathed cables
5 Use of a right-angled bell glass behind a metallic
    letter

Electrically illuminated signs operating at high or low voltage and high-voltage installations up to and including 5 kV to earth either for external or internal use. It does not include luminaires or exit signs operating at low voltage.