The following details are taken from the NBN MDU Building and design standards
Click Here to download your copy
The term CTL stands for Cable Transfer Location and BFD is a building fibre distributor. Both of these are enclosures to house passive NBN Equipment for multiple installations with one lead in – example a group of factories and shall follow the below requirements
| Requirement | Dimension/clearance |
| Minimum external enclosure size for 1 – 4 Serviceable Locations (SLs) | 600mm (h) x 600mm (w) x 300mm (d) to be used for a PCD, and single SDT if required. |
| Minimum external enclosure size for > 4 SLs | 800mm (h) x 800mm (w) x 300mm (d) to be utilised to accommodate a BUDI BFD and maximum of 2 x SDTs. |
| Minimum internal mounting dimensions | 760mm (h) x 760mm (w) x 250mm (d) |
| Minimum side and top clearance of equipment within the enclosure | 50mm from enclosure walls and other equipment. |
| Clearance from bottom of devices for cable entry | 250mm |
| Minimum degrees that PCD door must open to allow clear access to splice trays | 120° |
Built Boards range of IP66 Industrial enclosures can be used to the above specifying dimensions
Part Number BBE606030ST IP66 Enclosure 600x600x300 Galvanized Steel, Powder Coated Grey
Part Number BBE808030ST IP66 Enclosure 800x800x300 Galvanized Steel, Powder Coated Grey
A larger enclosure may be specified by NBN during the design phase.
The details of these enclosures are located on our Industrial Enclosure page.
Please note that the front enclosure door must be identified as NBN, with a permanent fixed label.