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Thermographic Surveying

Thermographic Surveying (Thermal Imaging)

Electrical testing surveyor using thermographic surveying equipment with a radiatorA useful addition to a preventative maintenance program. ETS can carry out a thermographic scan of all areas likely to be running too hot or too cold (in the case of failed refrigeration insulation for example).

Any areas of the site that register as potential too hot or too cold (be that electrical or mechanical) will be captured as thermal images and photographic images and will be included in the report.

It must however be understood that thermal imaging is not a substitute for Periodic Inspection and Testing. It can however provide a useful interim back up in a maintenance program between formal inspection and testing and can complement the overall system information available to the duty holder.

It can also be very beneficial in situations where access may be restricted or shutdowns to fully test are not possible.

Some of our competitors claim thermal imaging to be the be all and end all, but it is not a substitute and it should never be relied upon as the sole means of fault identification in the preventative maintenance program of an electrical systems.

What Thermal Imaging can identify

  • High resistance connections
  • Hot spots
  • Over loaded cables
  • Over loaded fuses or breakers
  • Imminent motor or conveyor bearing failure
  • Motor windings over heating
  • Overheating in distribution equipment
  • Phase load imbalance
  • Hot spots in high level lighting (easily scanned from the floor)
  • Heat build-up in overcrowded trunking
  • Thermal insulation breakdown (hot or cold)
  • Thermal loss
  • Damp ingress

What Thermal Imaging cannot identify

  • Over rated fusing
  • Under rated cables (unless they are over loaded at time of survey)
  • Physically damaged equipment, possibly exposing live parts
  • Lack of earth continuity
  • Undersized earth conductors
  • Prospective fault currents too high
  • Prospective fault currents too low
  • Poor insulation resistance
  • Borrowed neutrals
  • Broken ring mains
  • Lack of RCD protection
  • Protective device cascading of discrimination failures

And many more…

Thermal imaging can be carried out on a site-wide basis fairly quickly and cost effectively and is largely unintrusive.

However, panels and cabinets will need to be opened in order to scan the components within, this may require a shutdown of the panel to achieve.

The thermal imager needs to physically see any hot item to detect it, it cannot see through solid barriers such as doors or cabinets.


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Serving the UK & Ireland NationwideNationwide and Multi-Site Coverage National & regional contracts undertaken to date, amongst others include:

  • W.H.Smith & Sons - (High Street Retailers)
  • ABNA Agriculture - (Animal Feed Mills)
  • Arnold Clark Automobiles Ltd - (Motor Dealerships)
  • Heinz Foods - (Food Manufacturers)
  • Gerber Foods - (Soft Drink Manufacturer)
  • DS Smith Corrugated - (Paper Manufacturers)
  • Inchcape Retail - (Motor Dealerships)
  • Pendragon plc - (Motor Dealerships)
  • Rexel Ltd - (National Wholesalers)

From very large and complex industrial electrical installations in factories consuming many megawatts of power, to small offices requiring only a few portable appliances to be tested.

We have developed a range of highly detailed and user friendly Test Data & Survey Reports.


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