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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)

Parents
  • 0

    Is there a buried grid (e.g. steel reinforcement rods in concrete floor) that could be included in the bonding scheme?

    Large, "Long wheelbase" bare footed, and possibly wet nosed, animals are not a good combination for voltage differences - either between metallic parts or between a metallic parts and the general mass of the Earth.

    Another possibility is to remove the risk associated with earth faults to exposed-conductive-parts in another way - e.g. going for an all-insulated installation (double/reinforced insulation throughout) or use of separated circuits.

       - Andy.

Reply
  • 0

    Is there a buried grid (e.g. steel reinforcement rods in concrete floor) that could be included in the bonding scheme?

    Large, "Long wheelbase" bare footed, and possibly wet nosed, animals are not a good combination for voltage differences - either between metallic parts or between a metallic parts and the general mass of the Earth.

    Another possibility is to remove the risk associated with earth faults to exposed-conductive-parts in another way - e.g. going for an all-insulated installation (double/reinforced insulation throughout) or use of separated circuits.

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Andy good question I am pleased you asked. No there is no buried grid and here is the other spin on this...
    there is no bonding to the steel girders that make up this building and have their foundations deep in the earth. The cage structure is attached to these steel girders / beams.

    As such I want to address (and I may have this incorrect) by looking to equalise potential on the keepers side under fault conditions on the animals side you risk creating a potential difference

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