Level 2 specification
NR/L2/TEL/00028
Controlled Climate Trackside Housing for Telecommunications Equipment (formerly NR/PS/TEL/00028)
Issue 3, 07 September 2024 · Housings, earthing, power & masts
Minimum requirements for selecting climate-controlled trackside housings (cabinets with cooling) for telecoms equipment
Clause map — what each clause deals with
| 1 | Purpose | Minimum requirements for selecting climate-controlled trackside housings (cabinets with cooling) for telecoms equipment |
| 2 | Scope | Spec for the design and construction of climate-controlled housings for active telecoms |
| 3 | Roles and responsibilities | Who defines the housing requirements for the assets inside |
| 4 | Definitions and Glossary | Definitions and glossary |
| 5 | Network Rail Health and Safety Management System (SMS) | CDM applies to the whole process |
| 6.1 | Design Criteria | Design criteria — internal environment for the equipment |
| 6.2 | Configuration | What the housing has to accommodate — equipment, cabling, power, batteries, cooling |
| 6.3 | Incoming Services | Incoming services — cable entry and bend radii |
| 6.4.1 | Telecommunications Equipment and Cabling Compartment | Telecoms equipment and cabling compartment |
| 6.4.2 | Extra Low Voltage Power Equipment and Cabling Segregation | ELV power segregation |
| 6.4.3 | Battery Equipment Compartment | Battery compartment |
| 6.4.4 | Low Voltage Power Equipment and cabling | LV power and the housing earthing: main earthing terminal (MET) bar, each rack bonded back to it, DNO and local earths separable for testing. No earth resistance value in this issue; superseded NR/PS/TEL/00028 Iss 1 (cl 4.2.4) and Iss 2 (cl 6.2.4) gave a typical local telecoms earth value (4 ohms, occasionally up to 20) |
| 6.4.5 | Passive Rack Enclosure | Passive rack enclosure |
| 6.4.6 | Generator Connection Equipment | Generator connection |
| 6.5 | Finish | Finishes and colours available |
| 6.6 | Fire | Fire performance of housing materials |
| 7 | Operating Environment | Operating environments the housing must suit (platforms, lineside, subsurface) |
| 8 | Environmental Controls | Environmental controls — ingress protection, climate control |
| 9 | Electromagnetic Compatibility (EMC) | EMC protection |
| 10 | Storage, Transport and Installation | Storage, transport and installation guidance from the manufacturer |
| 11 | Maintenance | Maintenance regime and design life |