BS 6351-1:1983

Foreword
Cooperating organizations
Specification
Section one. General
0. Introduction
1. Scope
2. Definitions
Section two. Requirements for all ESH devices
3. General
4. Grading
5. Construction
6. Terminations
7. Tests
8. Test methods
9. Marking
Section three. Additional requirements for ESH devices
for use in hazardous areas
10. General
11. Types of protection
12. Terminations
13. Temperature classification
14. Type test to establish the maximum temperature
     of the surface to be heated
15. Marking
Appendix
A. Guidance regarding certification
Tables
1. Degree of water resistance
2. Degree of mechanical strength
3. Minimum tensile breaking loads
4. Temperature correction factors for converting
     resistances, at various temperatures, of annealed
     high conductivity copper of 100 % conductivity to
     the standard reference temperature of 20 deg C
5. Conditioning treatments
6. Proof loads for deformation test
7. Heights of fall for impact test
Figures
1. Impact test apparatus
2. Low temperature bend test apparatus
3. Apparatus for determining relationship between
     electrical loading and temperature of surface to
     be heated
4. Typical graphs of TL against TV
5. Typical graph showing variation of constructional
     material temperature (TL) with electrical loading
     for different values of test place temperature (TV)
6. Typical graphs of TS against TV
7. Typical graph showing variation of sample surface
     temperature (TS) with electrical loading for
     different values of test plate temperature (TV)

Requirements for the construction and testing of electric surface heating devices when applied to metal surfaces. Requirements and recommendations for use in non-hazardous areas and in certain specific hazardous areas classified as Zone 1 and Zone 2 in accordance with BS 5345.