Problem

The Main Utility Fuses Blown meaning the building lost all mains power. Caller advised it was due to water ingress in plant room.

Findings

• Main isolator was unserviceable due to water ingress and was unsafe to put into service.
• Engineer checked for water ingress, but no water was found.
• Engineer found that the boards were damp due to the plant room being underground.
• ADS deemed it unsafe to reinstate power supply to the building.
• Main supply cable was undersized.

Solution

• Old busbar chamber was stripped out and new cables installed.
• ADS supplied and fitted new 95 ml armoured SWA from new 350-amp isolator direct to main switch board.
• Permanent heater to be installed to keep the room warm thereby avoiding future problems with low temperature/dampness.
• ADS liaised onsite with utilities when fuses were reinstated.
• Test certificate issued to show building now compliant with safety regulations.
• Test and commission new cable.

The building was fully operational within two days and client scored ADS 10/10 on the following criteria.