Level 2 specification
NR/L2/TEL/30034
Radio Mast Lightning Protection and Earthing System (Formerly RT/E/S/30034)
Issue 4, 6 March 2010 · Housings, earthing & masts
Clause map — what each clause deals with
| 1 | Purpose | Design requirements for lightning protection and earthing of radio towers |
| 2 | Scope | Who uses it — PMs, tower and earth designers, installers |
| 3 | Roles and Responsibilities | Responsibilities defined at project start |
| 4 | Definitions | Definitions — bond, electrode and so on |
| 5 | Risk Assessment of Lightning Attachment | Lightning attachment risk assessment |
| 6 | Fundamental Requirements | Fundamental protection requirements |
| 7.1 | Site selection | Site selection factors |
| 7.2 | Site survey | Site survey for earthing |
| 7.3 | Design | Design basis — this standard plus BS 6651/BS 7430 |
| 7.4 | Design documentation | Design documentation for NR approval |
| 7.5 | Design acceptance | Design acceptance, verification, construction, commissioning |
| 7.6 | Installation acceptance | Installation acceptance |
| 8 | Radio Tower Requirements | Tower requirements — continuous path, fixings, bonds |
| 9.1 | Spiking | Spiking precautions — buried services |
| 9.2 | Earth resistance | Target earth resistance |
| 9.3 | Earthing design | Earthing design per tower leg |
| 9.4 | Guy wires | Guy wires |
| 9.5 | Structural steel | Using structural steel in the earth system |
| 9.6 | Earth ring | Earth ring |
| 9.7 | Earth rod selection | Earth rod selection |
| 9.8 | Master electrode | Master electrode in a pit |
| 9.9 | Earth testing | Earth testing provisions |
| 9.10 | Towers located on rock | Towers on rock |
| 10.1 | Antenna and antenna feeder | Antenna and feeder within zone of protection |
| 10.2 | Surge arrestor | Surge arrestors on feeders |
| 11 | Towers and antennas located in AC electrified areas | Towers in AC electrified areas — traction bonding risk and schemes |
| 12 | Towers located in DC electrified areas | Towers in DC electrified areas |
| 13 | Typical diagram of tower LP&ES in non-electrified or DC | Typical LP&ES diagram — non-electrified/DC |
| 14 | Typical diagram of tower LP&ES in AC electrified area | Typical LP&ES diagram — AC |
| Appendix A | Typical Electrical Drawings | Typical electrical drawings for towers and REBs |