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Cable verification survey

The client required a thorough cable verification survey due to ongoing problems pertaining to the positive identification of critical circuits within the hospital’s cable system.

The Metropolitan solution

Metropolitan’s TEGG department was deployed to verify the relevant cables using a tone generator – connecting it to live circuits using TEGG energised testing procedures.

Metropolitan’s TEGG department always approach a works with a safety-first methodology. In this case, the energised procedures that were followed ensured the technicians conducting the cable verification wore:

  • Arc-flash rated suits
  • LV working gloves
  • LV mats to stand on
  • LV rescue hooks within reach
  • A safety observer

Alongside this, the relevant administrative procedures included:

  • A clients’ permit
  • A RAMS (Risk Assessment Method Statement)
  • The Metropolitan TEGG Health and Safety documents

A tone generator’s purpose is to identify cables by sending a signal through a live conductor, which it needs to be connected to. This signal is picked up by a receiving wand, which gives off an audio cue. This audio cue (usually a ‘beep’) becomes increasingly louder and faster the closer the signal gets to a cable – eventually developing into a continuous monotone once it reaches it. Alongside a visual screen, this helps the technicians to pin-point the cables they are looking for.

In large buildings such as hospitals, there are an enormous amount of cables working their way through the walls and ceilings. As such, technicians need help to quickly identify them all, which is where the tone generator comes in. It tracks a cable’s route through the building, eventually leading the technician to its destination. Once its destination is found, the cable can be positively verified and labelled accordingly.

Every critical circuit was positively identified on-site using this cable verification process, with a spreadsheet being created for the client to show all circuits, their destination and their identification.

This information was consequently used to create new, up-to-date names for the circuits, with Metropolitan’s TEGG department arranging and applying new labels for each circuit across the whole site.