What is the fundamental difference between YY, CY, and SY control cables?

These are the three most common designations used in international engineering specifications to define mechanical and electrical protection levels:

YY (Unscreened): Used in dry or moist environments for light mechanical stress. It offers no protection against interference but provides excellent flexibility for fixed or light mobile installations.

CY (Screened/Shielded): Features a Tinned Copper Wire Braid (TCWB) or aluminum foil. It is essential for environments with high Electromagnetic Interference (EMI) or Radio Frequency Interference (RFI) to ensure signal integrity.

SY (Armored/Braid Protected): Includes a Galvanized Steel Wire Braid (GSWB). This provides superior mechanical protection against physical impact or abrasion, though it offers less EMI protection than the CY variant.