In wire coding, what does the third letter represent?

In wire coding, the third letter specifically represents the progression letter, which indicates the sequence or development of the product. This coding system helps in identifying the specifications and sequence in which the wires are intended to be used. It is essential for ensuring that the appropriate wire is selected for a particular application, helping to maintain standards within electrical systems.

The wire gauge size is typically denoted by a different aspect of the coding, usually represented earlier in the coding system. The circuit number can also be identified in a separate segment of the code, and the insulation type would be represented by another letter, often the first or second. Thus, understanding the distinct roles of each letter in wire coding is crucial for proper electrical installation and safety.