Cable pathways and enclosures
Installation requirements for cable pathways and enclosures are included in section 10. Pathways and spaces shall comply with AS/NZS 3084.
General Pathway Requirements
Cable pathways shall be selected and designed to:Maintain minimum segregation from other services as mandated by AS/NZS 3000 in accordance with AS/NZS 3080 ZA.3.1.
- Minimise interference in accordance with AS/NZS 3080 ZA.3.2.
Intra Building Pathways
Cable trays should be perforated galvanised mild steel sheet.
Minimum steel thickness for cable tray should be:
- 1.0mm for trays up to 150mm wide and
- 1.2mm for trays up to 300mm wide.
Trays shall have folded edges with minimum height of 20mm.
Electrical continuity shall be maintained along the full length of cable trays.
Ducting and Conduits
Ducting should be tamper-resistant. Conduit is preferred for physical security.
Ducting and conduit shall be selected to be aesthetically matched to the building as far as practicable (colour to be determined on site prior to ordering) and sized to suit the number of cables.
Ducting shall be single compartment of rectangular section. Clip-in covers shall not be used for exposed or accessible ducting.
Ducts and conduits should be selected to have 50% spare capacity after completion of the works.
Catenary wires shall be installed to support internal cables within ceiling spaces and under floors.
The maximum size bundle of Category 6 4 pair cables supported by a catenary wire shall be 24.
The catenary wires shall be sized, terminated and supported to sustain the load of attached cables without exceeding the maximum sag requirements of AS/NZS 3084 ZB22.214.171.124.
Communication enclosures are used to house and restrict access to cabling, active LAN components and other communications hardware. Enclosures may be free-standing or wall-mounted.
Enclosures and racks shall be designed for 19” equipment mounting.
Cabinets and wall frames shall comply with the relevant requirements of IEC 60297 (Dimensions of Mechanical
Structures of the 482.6 mm [19 in] Series).
Open frame racks shall not be used.
The enclosure containing the active equipment shall provide a minimum of 18RU equipment mounting space and be capable of bearing a load of no less than 45kg without deformation. Enclosures shall be 600mm wide with a minimum internal depth of 500mm.
The enclosures shall be fitted with:
- Front 19” mounting rails
- Horizontal cable tidy panels and/or loops
- A supporting shelf
- Power rail providing no fewer than five outlets incorporating a 10A miniature circuit breaker
- Keyed, lockable, perspex or toughened glass front door
- Earth bar or stud
Enclosures shall provide passive ventilation by vented panels.
Metal surfaces of the enclosure and accessories shall be powder-coated, painted or otherwise protected against corrosion.
Enclosures shall be bonded to the protective earth system using a minimum 2.5mm2 green/yellow conductor and to the Telecommunications Reference Conductor (TRC) if provided.
Free-standing Enclosures (Cabinets)
Free-standing enclosures may be installed on a plinth to facilitate cable entry from beneath.
Free-standing enclosures shall be fitted with:
- Removable rear and side panels
- Keyed, lockable, steel rear door or removable panel in cases where insufficient clearance is available to accommodate a door
- Levelling adjustment
Wall-Mount Enclosures (Cabinets)
The wall shall be structurally adequate to support the enclosure and contents.
Wall mounting enclosures shall be of swing frame design to facilitate rear access. An additional 70mm depth shall be allowed for the hinged wall bracket. Enclosures shall have no sharp edges or protrusions that could cause injury to persons.
A dual 10 ampere power outlet on a dedicated circuit shall be provided for each communication enclosure.
The power outlet should be located on the wall 300mm above the floor behind free-standing enclosures.
The power outlet shall be located on the wall behind and 600mm above the bottom edge of wall-mounted enclosures.