Level 3 work instruction

NR/L3/TEL/30074

Specification for the Maintenance of Telecommunication Earths and Screening Systems (Formerly NR/L2/TEL/30074)

Clause map — what each clause deals with

1	Purpose	Maintenance requirements for telecoms earths and screening systems
2	Scope	Applies to all maintaining telecoms earths and screening
4	Responsibilities	Maintainer precautions
Appendix A	Equipment Room Functional Earth Farms	Maintaining and testing equipment room functional earth farms and the bonding of telecoms frames to them
Appendix B	Lineside Fast Transient Earth Systems	Lineside fast transient earth (FTE) systems
Appendix C	Testing of Mutual Screening Conductor Earth System	Testing the earth farms on a mutual screening conductor: the target resistance for each earth farm, the screening conductor to earth reading, and the average check over consecutive earth farms