CIRCUIT TESTING  AND EICR

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The latest regulation requires all plastic enclosures to be changed to metal and here is why?

Regulation 421.1.201 was introduced because of reports from fire investigators of a recent trend of increasing numbers of fires involving consumer units having a moulded thermoplastic enclosure. See Figures 1, 2 and 3.

The cause of the fires investigated was almost invariably found to be resistance heating as a result of poor electrical connections due to poor workmanship or lack of maintenance.  Examples of such poor workmanship are thought to include:

  • failure to tighten neutral conductor connections to the same torque as line conductor connections due to a misconception that neutral conductors carry less current

  • inadvertently taking cable insulation inside the terminal at a connection, resulting in the securing screw or the clamp of the terminal not making proper contact with the conductor

  • failure to check factory-installed connections for tightness where required to do so by the manufacturer, and

  • tightening connections to an incorrect torque and/or with inappropriate tools.

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