The NAL MOBS (Mechanical Only Breakaway System) is a physical termination for NE or LE Passively Safe Columns. It is a minimum option for isolating the electricity supply to a single structure under impact. The systems activation relies on the physical disconnection, on impact of a tethered in-line IP68 Plug and Socket.

The MOBS System is located within an IP67 enclosure which is mounted in the NAL underground STAKKAboxTM Access Chamber. This is a lightweight twin wall structural Access Chamber which is capable of withstanding a 40 tonne vertical load without the need for a concrete surround for support. A galvanised steel eyebolt is provided to enable a secure fixing point within the STAKKAboxTM Access Chamber. The STAKKAboxTM Access Chamber is normally located within 3-5 metres from the structure it is protecting.

The MOBS unit is assembled to your requirements and can accommodate a range of cable sizes from 6mm-25mm 4 core SWA cables. Each unit is provided with 5 metres of flex cable as standard, complete with one IP68 in-line Plug and Sockets. These are mounted and tensioned within the Passively Safe Structure, just below ground level. On impact if the column detaches from it’s base the tensioned in-line Plug and Socket will separate, leaving the detached structure voltage free.

Important Note:
This system does not provide an automatic electrical disconnection. It relies on tension being applied to a tethered plug and socket, which will pull apart if the column detaches under impact.
Please note:
If column fails to detach, the plug and socket will not disconnect!
FOR ZERO VOLT GUARANTEED DISCONNECTION PLEASE REFER TO OUR ABOVE OR BELOW GROUND SIS- SAFETY ISOLATION SYSTEM