Monthly Archives: February 2025

Amersham – LVAC Cable Installation

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As part of the dual power SER upgrades DPSS were tasked by Amco Giffen with the survey, route design and installation and commissioning of the SWA supply cables for various stations across the network. This ranged from 90mm 4 core right up to 300mm 4 core SWA.
Amersham station required the installation of 4 drums of 4 core 300mm Cable, 2 drums of 1 Core 150mm Cable and 1 x 7 core 2.5mm cable, including jointing.

Cockfosters Tag & Trace Survey

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DPSS were employed to perform a Tag & Trace Survey at Cockfosters Depot.


This was part of the preliminary phase of works which would lead to the installation of new maintenance facilities.


The upgrade to Cockfosters Depot will see the demolition of the existing depot, cleaning shed and train wash. This will be followed by the construction of a combined maintenance and cleaning shed, new internal access road, car parking, vegetation removal and associated works by VolkerFitzpatrick.


The Tag & Trace Survey scope was to identify:
– Electrical Systems
– AC Mains (LV, High Mast Lighting, Walkway Lighting)
– DC Mains (Traction Current)
– Communications (Telephone line, Data cables, security cables, CCTV, BMS, PA)
– All cable runs, including interlocking Machine Rooms (IMR) cables
– All Switch rooms
– Fibre Optic Cabling
– Signalling Systems
– Fire Systems
– Legacy Assets (redundant assets which are no longer in use, but are still in-situ)

DPSS Tagged & Traced over 2000 cables across 4 main areas of the depot.

LVAC Cable Pull – Uxbridge

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As part of the dual power SER upgrades DPSS were tasked by Amco Giffen with the survey, route design and installation and commissioning of the SWA supply cables for various stations across the network. This ranged from 90mm 4 core right up to 300mm 4 core SWA.

At Uxbridge Station DPSS installed a 120mm 4 Core along with a 95mm CPC Earth cable. Because of the distances the cable needed to run we also performed mutliple joints.

Historic Whitechapel Refurbishment

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Whitechapel station is one of the central London Crossrail interfacing stations. In 2012 enabling works started on Whitechapel Station preparing for the heavy civils programmes which would transform Whitechapel Station.
Part of the early works required the sterilisation of the East Side of the Station to allow existing structures to be removed to make way for the new Ticket Hall and connecting concourses.
The vast majority of services were relocated to the TTH (Temporary Ticket Hall) on the west side of the station however a number of station-to-station services running up to the retaining trackside walls had to remain in place.
These retained services were put into a temporary fixed state to allow for the heavy civils works to proceed.
DPSS were tasked with the removal of existing redundant CMS and to provide temporary support to signals, comms and LV cables.
The removal of CCTV cameras and associated power cables and junction boxes
The removal of redundant cables on platform 5 & 6
The removal of existing hangers to be replaced with bespoke hangers
Installation of CMS, including on Bridge D124b
Installation of additional CMS/Bracketry for the support of HV cables (F721) and recolation of cable F721
All works completed on time and in budget