What is BS 2G 215-2- General requirements and tests of extension cables about?  
BS 2G 215-2 specifies the design requirements and tests for the crimping of non-insulated terminations, of nickel-chromium or nickel-aluminium alloy, to the standard flexible conductors of nickel-chromium or nickel-aluminium thermo-couple extension cables, respectively, in such a manner, that the thermoelectric integrity and constancy of resistance of a thermocouple circuit are contained within specified limits.
Although the metallic materials used in the crimped joint will be the same for all groups, the limiting the temperature of use of the crimped joint is defined by the insulation of the cable and will fall within one of the following groups: 105 °C, 150 °C, 200 °C, and 260 °C.
Who is BS 2G 215-2- General requirements and tests of extension cables for? 
BS 2G 215-2 on general requirements and tests of extension cables is useful for: 
- Aircraft and space products manufacturers         
- Aerospace products manufacturers   
- Testing agencies involved in the inspection of spacecraft and aerospace products         
- Quality control personnel for spacecraft products      
- Aeronautical engineers
Why should you use BS 2G 215-2- General requirements and tests of extension cables?  
Strip or bar material used for the manufacture of terminations should be nickel-chromium or nickel-aluminium alloy having thermoelectric properties against a platinum standard or a nickel-chromium or nickel-aluminium sub-standard. Tools shall be capable of crimping to the requirements of BS 2G 215-2.
Non-insulated nickel-chromium or nickel-aluminum alloy terminations are crimped to standard flexible conductors of nickel-chromium or nickel-aluminium thermo-couple extension cables according to BS 2G 215-2, which specifies the design requirements and tests to ensure that the thermoelectric integrity and constancy of resistance of a thermocouple circuit are contained within specified limits.
The following three kinds of tests are specified:
- Type tests
- Production control tests by the manufacturer
- User’s control tests
