At a minimum, convenience receptacles in an ER or TR are to be located ________ AFF.

BICSI and ANSI/TIA-569 specify that convenience receptacles in an ER or TR must be placed at a minimum of 150 mm (6 in) above the finished floor. This minimum height provides protection from minor water intrusion or standing water while still allowing power access near floor-level equipment. Outlets are often installed higher in practice, but 150 mm is the code-specified minimum.

300 mm (12 in) AFF exceeds the minimum requirement and is not the value the standard identifies as the minimum for ER or TR spaces.

375 mm (15 in) AFF is above the minimum threshold and does not correspond to the value specified in applicable telecommunications space standards.

450 mm (18 in) AFF is associated with general commercial receptacle placement guidelines but is not the minimum required for ER or TR environments.