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Bonding to extraneous-conductive part in a Zoo compound

Tom J256

A animal compound in a zoo made up of a metal framed building, steel uprights and substantial metal enclosures within the building

On one side of the enclosure the large animal housing that contains the animal shelter when within the building but no exposed conductive parts

on the other side of the enclosure (metal cage between the two) the area for the keepers to work that does contain exposed conductive parts - example large pressure washer.

What are the thoughts on bonding the metal caging to the MET ? (the caging - substantial 50 mm sq metal section - is an extraneous-conductive part by measurement via connection to the metal girders of the building)

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    Hi Tom. According to BS 7671 section 705, an electrical installation in a zoo has to follow certain rules (Special locations). You have measured that the metal cages are connected to the metal beams of the building, which makes them extraneous-conductive-parts. This means that the metal cages could bring a potential difference into the installation. This could create a dangerous difference in voltage between the metal cages and any exposed-conductive-parts in the area where the keepers work, such as the big pressure washer. This could cause a risk of electric shock to humans and animals who touch these parts. Therefore, it might make sense to bond the metal cages to the main earthing terminal (MET) to reduce this risk.

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    Hi Tom. According to BS 7671 section 705, an electrical installation in a zoo has to follow certain rules (Special locations). You have measured that the metal cages are connected to the metal beams of the building, which makes them extraneous-conductive-parts. This means that the metal cages could bring a potential difference into the installation. This could create a dangerous difference in voltage between the metal cages and any exposed-conductive-parts in the area where the keepers work, such as the big pressure washer. This could cause a risk of electric shock to humans and animals who touch these parts. Therefore, it might make sense to bond the metal cages to the main earthing terminal (MET) to reduce this risk.

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