BS 4662:1970

Cooperating organizations
Foreword
Specification
1. General requirements for boxes with fixed lugs
1.1 Scope
1.2 Definitions
1.3 Service conditions
1.4 Marking
1.5 Construction and materials
1.6 Earthing
1.7 Type tests
1.8 Mechanical strength
1.9 Stability at elevated temperatures
1.10 Resistance to corrosion of steel and cast iron
      boxes
2. Additional requirements for flush switch boxes of
    16 mm internal depth fitted with lugs providing
    for angular adjustment
2.1 Construction
3. Additional requirements for flush boxes of greater
    than 16 mm internal depth fitted with one or more
    lugs providing for angular adjustment
3.1 Construction
Table
1. Minimum wall thickness of boxes
Figures
1a. Electrical accessory box: size UA1
1b. Electrical accessory box: size UA1 (Steel)
2a. Electrical accessory box: size UA2
2b. Electrical accessory box: size UA2 (Steel)
3a. Electrical accessory box: size UA3
3b. Electrical accessory box: size UA3 (Steel)
4a. Electrical accessory box: size UA4
4b. Electrical accessory box: size UA4 (Steel)
5a. Electrical accessory box: size UA6
5b. Electrical accessory box: size UA6 (Steel)
6. Electrical accessory architrave box: size 1 (Steel)
7. Electrical accessory architrave box: size 2 (Steel)
8. Gauges for lug profile of fixed lug boxes
9. Gauges for lug profie and depth of 16 mm boxes
    with lugs providing for angular adjustment
10. Gauges for lug profile for boxes of greater than
    16 mm internal depth having one or more adjustable
    lugs
11. Gauges for internal free space and fixing centres
    for architrave boxes
12. Impact test apparatus

Boxes suitable for recessed or surface mounting.