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Retrofitting SPDs - Industrial Environment

Elliot0114

Hi, apologies if this has been discussed previously but I’m after advice on retrofitting SPDs onto an existing installation which doesn’t currently contain any in an industrial environment. The installation is a 400V DNO supply to a main MCCB switch in one building which then supplies a large 400V Panel in a separate building, which contains multiple existing supplies and a spare switch which I am planning to use to supply my new equipment.

 

The DNO and MCCB switch don’t have anywhere practical to connect the SPD device which would mean amending the supply arrangement so the SPD can be added in.

 

Is it as simple as If I am not amending the existing supply arrangement, I just need to add a Type 2 SPD to protect my new supply and a potentially a Type 1 SPD onto the Panel for additional protection if it is easy to do so?

 

In the regs it says the SPD should be installed ‘as close as possible to the origin of the electrical installation’ but the SPD manufacturer stated it should be as close as ‘practicable’. Is the practicable statement correct or is that just a common sense approach?

 

Thanks in advance for any advice. 

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    Elliot0114 said:
    Is it as simple as If I am not amending the existing supply arrangement, I just need to add a Type 2 SPD to protect my new supply and a potentially a Type 1 SPD onto the Panel for additional protection if it is easy to do so?

    Not always.

    It may require the installation to be assessed as a whole.

    Don't forget also, switching transients as well as indirect lightning transients in this type of environment.

    Most importantly, though, does the building have an LPS (or is it adjacent to another building with an LPS)? If so, this would have to be assessed under BS EN 62305 series and not BS 7671.

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  • 0
    Elliot0114 said:
    Is it as simple as If I am not amending the existing supply arrangement, I just need to add a Type 2 SPD to protect my new supply and a potentially a Type 1 SPD onto the Panel for additional protection if it is easy to do so?

    Not always.

    It may require the installation to be assessed as a whole.

    Don't forget also, switching transients as well as indirect lightning transients in this type of environment.

    Most importantly, though, does the building have an LPS (or is it adjacent to another building with an LPS)? If so, this would have to be assessed under BS EN 62305 series and not BS 7671.

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