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522.6.1 Impact (AG).

Zoomup
Have you every said: " I haven't got a grommet or bush so I'll just run the cable through the sharp edged metal hole anyway. It'll be O.K?"


Well, 522.6.1 says: "Wiring systems shall be selected and erected so as to minimise the damage arising from mechanical stress, e.g. by ABRASION, PENETRATION, TENSION, or COMPRESSION, during installation, use or maintenance."


The old familiar expression comes to mind: for the want of a nail the horseshoe was lost, and its following disastrous consequences. For the want of a grommet, materials and correct installation lives were lost.

https://www.youtube.com/watch?v=Ql16ggFvc_g


Z.


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  • 0
    lyledunn:

    Rose park Care Home January 2004. Fourteen dead. Ignition source; arcing where cable passed through knockout in distribution board. No grommet fitted.

    Of course as the introduction to the video indicates, it normally takes a series of things to go wrong. Nonetheless, rare as it might be, really important to properly secure cables and protect them as they pass through knockouts to guard against potential arcing.


    The fire started in a cupboard along a corridor, following an electrical fault. It is thought that aerosols stored in the cupboard exploded, the force of the blast blowing open some nearby fire doors along the corridor. Materials immediately outside the cupboard – chairs, wallpaper, timber handrails – ignited, causing heat and smoke to spread.


    A terrible avoidable tragedy.


    Z.


Reply
  • 0
    lyledunn:

    Rose park Care Home January 2004. Fourteen dead. Ignition source; arcing where cable passed through knockout in distribution board. No grommet fitted.

    Of course as the introduction to the video indicates, it normally takes a series of things to go wrong. Nonetheless, rare as it might be, really important to properly secure cables and protect them as they pass through knockouts to guard against potential arcing.


    The fire started in a cupboard along a corridor, following an electrical fault. It is thought that aerosols stored in the cupboard exploded, the force of the blast blowing open some nearby fire doors along the corridor. Materials immediately outside the cupboard – chairs, wallpaper, timber handrails – ignited, causing heat and smoke to spread.


    A terrible avoidable tragedy.


    Z.


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