BS EN 60238:2004 + Amendment 2:2011 Edison screw lampholders
BS EN 60238 applies to lampholders with Edison thread E14, E27 and E40, designed for connection to the supply of lamps and semi-luminaires only.
It also applies to switched-lampholders for use in a.c. circuits only, where the working voltage does not exceed 250 V r.m.s. BS EN 60238 also applies to lampholders with Edison thread E5 designed for connection to the supply mains of series connected lamps, with a working voltage not exceeding 25 V, to be used indoors, and to lampholders with Edison thread E10 designed for connection to the supply mains of series connected lamps, with a working voltage not exceeding 60 V, to be used indoors or outdoors. It also applies to lampholders E10 for building-in, for the connection of single lamps to the supply. These lampholders are not intended for retail sale.
As far as it reasonably applies, BS EN 60238 also covers lampholders other than lampholders with Edison thread designed for connection of series-connected lamps to the supply.
This type of lampholder is for example used in Christmas tree lighting chains.
As far as it reasonably applies, BS EN 60238 also covers adapters.
This standard also covers lampholders which are, wholly or partly, integral with a luminaire or intended to be built into appliances. It covers the requirements for the lampholder only. For all other requirements, such as protection against electric shock in the area of the terminals or of the lamp cap, the requirements of the relevant appliance standard shall be observed and tested after building into the appropriate equipment, when that equipment is tested according to its own standard. Such lampholders as well as lampholders provided with a snap-on outer shell, for use by luminaire manufacturers only, are not for retail sale.
BS EN 60238 applies to lampholders to be used indoors or outdoors in residential as well as in industrial lighting installations. It also applies to candle lampholders. BS EN 60238 does not cover locations where special conditions prevail, as for street lighting, on board ships, in vehicles and in hazardous locations.
Contents of BS EN 60238:
- 1 General
- 2 Definitions
- 3 General requirement
- 4 General conditions for tests
- 5 Standard ratings
- 6 Classification
- 7 Marking
- 8 Dimensions
- 9 Protection against electric shock
- 10 Terminals
- 11 Provision for earthing
- 12 Construction
- 13 Switched lampholders
- 14 Moisture resistance, insulation resistance and electric strength
- 15 Mechanical strength
- 16 Screws, current-carrying parts and connections
- 17 Creepage distances and clearances
- 18 Normal operation
- 19 General resistance to heat
- 20 Resistance to heat, fire and tracking
- 21 Resistance to excessive residual stresses (season cracking) and to rusting
- Annex A (normative) Season cracking/corrosion test
- Annex B (informative) Guidance for requirements in IEC 61058-1 applicable to switches in lampholders (see 13.2)
- Annex C (informative) Guidance for special requirements in appliance standards – Household and similar electrical appliances
- Annex ZA (normative) Normative references to international publications with their corresponding European publications
- Figure 1a – Nipple thread for lampholders. Basic profile and design profile for the nut and for the screw
- Figure 1b – Nipple thread for lampholders. Basic profile and design profile for the nut and for the screw
- Figure 2a – Gauges for metric ISO thread for nipples
- Figure 2b – Gauges for ISO standard pipe thread for nipples
- Figure 3 – Gauge for holes for backplate lampholder screws
- Figure 4 – Normal operation test apparatus
- Figure 5 – Test caps for the test of clause 18
- Figure 6 – Torque apparatus
- Figure 7 – Tumbling barrel
- Figure 8 – Impact-test apparatus
- Figure 8a – Mounting support
- Figure 9 – Pressure apparatus
- Figure 10 – Ball-pressure test apparatus
- Figure 11 – Test cap for the tests of 14.4 and 19.3
- Figure 12 – Bending apparatus
- Figure 13 – Test cap A and test cap B for lampholders E14
- Figure 14 – Test cap for lampholders E27
- Figure 15 – Test cap for lampholders E40
- Figure 16 – Standard test finger (according to IEC 60529)
- Figure 17 – Clarification of some definitions
- Figure 18 – Preparation of specimens for the needle-flame test of 20.4
- Table 1 – Thickness of screw shells and contacts
- Table 2 – Minimum effective screw lengths
- Table 3 – Dimensions of threaded entries and set screws
- Table 4 – Minimum dimensions of pillar-type terminals
- Table 5 – Minimum dimensions of screw-type terminals
- Table 6 – Pull and torque values
- Table 7 – Insertion torque
- Table 8 – Minimum and maximum removal torques
- Table 9 – Test cap dimensions
- Table 10 – Heights of fall
- Table 11 – Maximum deformation values
- Table 12 – Torque values
- Table 13a – Minimum distances for a.c. (50/60 Hz) sinusoidal voltages Impulse withstand category II
- Table 13b – Minimum distances for a.c. (50/60 Hz) sinusoidal voltages Impulse withstand category III
- Table 14 – Minimum distances for non-sinusoidal pulse voltages
- Table 15 – Heating cabinet temperatures
- Table A.1 – pH adjustment
