What are separation distances

"I have checked the latest BSEN 50174, BS 6701 and BS7671 titles nothing has changed however, in BS 7671 LV cables now have a defined minimum distance with or without permanent separation.
5.4.4 Information technology cabling within buildings and other structures
5.4.4.1 Electromagnetic interference
The segregation of cabling with regard to electromagnetic interference shall be in accordance with BS EN 50174 2.
5.4.4.2 Protection of telecommunications cabling and attached equipment
NOTE The following requirements represent the “Local regulations for safety” referred to in BS EN 50174 2:2009+A2:2014, 6.1.
Telecommunications cabling shall not be installed in any compartment of a cable management system that contains LV electricity supply cabling with unenclosed live terminals.
Telecommunications cabling and LV power supply cabling shall be separated by a distance:
a) ≥150 mm;
b) ≥50 mm, where the separation is provided and maintained by a partition as specified in BS 7671, or
c) 50 mm where one or more of the following conditions are met:
1) the LV electricity supply cables are enclosed in a separate conduit or trunking which, if
metallic, is bonded in accordance with BS 7671;
2) the LV electricity supply cables are of a mineral-insulated type;
3) the LV electricity supply cables are of an earthed armoured construction;
4) the LV electricity supply cables are of a flexible, insulated and sheathed type (e.g. “kettle leads” supplying LV mains power to telecommunications equipment in cabinets).
Where telecommunications cables and the electricity supply cables cross and there is a risk of damage, mechanical protection shall be provided at the crossing point."