Speed indicator light transformer is coded as which option?

• A. Ugt
• B. Ug
• C. Ur
• D. V

Answer: (A)

In signal component coding, a three-letter code identifies the exact part by grouping the type, the lamp color or function, and any accessory or feature. For a speed indicator light transformer, the trailing letter indicates the presence of a transformer, so the code must include a t. The first letter designates the unit family, and the second letter shows the lamp color or operation, with g representing green (signal to proceed) in this context. Putting it together, Ugt uniquely identifies the speed indicator light transformer: the unit group U, a green lamp aspect g, and the transformer t. The other codes either omit the transformer designation or imply a different configuration, so they don’t describe the speed indicator light transformer.