The MINIMUM separation distance between grounded metal telecommunications pathway and unshielded power lines is:

75 mm (3 in) is insufficient separation and does not meet the minimum standard for unshielded power lines adjacent to telecommunications pathways.

150 mm (6 in) does not meet the minimum required 300 mm separation for grounded metal pathways near unshielded power conductors.

The minimum required separation between a grounded metal telecommunications pathway and unshielded power lines is 300 mm (12 in) per ANSI/TIA-569 pathway separation requirements. Grounded metallic pathways provide some shielding benefit, but the 300 mm minimum still applies when the power conductor is unshielded to adequately reduce inductive coupling and EMI into the telecommunications cabling.

610 mm (24 in) exceeds the minimum requirement and applies to higher-voltage or unshielded open wiring scenarios, not this specific configuration.

1220 mm (48 in) is far beyond the required minimum and is not a standard separation distance specified for this pathway configuration.