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Discuss SPD to cover whole site? in the Industrial Electrician Talk area at ElectrciansForums.co.uk.

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  1. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Hi Guys,
    Having recently done my 18th, and various reading of SPD requirements, I feel that within the factory where I work (food industry), we should be using SPD's?

    We have an onsite transformer which we own, 11kV to 400v, which then splits after the meter to two main switch panels, which subsequently feed the factory. In total there are 31 distribution boards and 100's of final circuits.

    What options are there for SPD's?

    Is it feasible installing one to cover the whole factory, or would it be better installing them on to the incommer of each DB? Or what are the other options?

    There is the risk assessment formula (Reg 443.5 I think), but I don't see how we can get the DNO information for cable lengths etc?



    Thanks for any advice.
     
  2. Vortigern
    Offline

    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    You would have to do both. And it would be better to get a design spec from one of the manufacturers anyway. i.e. Type 1 and Type 2 sometimes even more than that.
     
  3. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Contact Crown House Furze for info I did when I planned work fo overseas jobs very helpful imom well it was a while ago but give them a try.
     
  4. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Both at the main incommer to the factory and each of the 31 DBs as well?

    Would the main incommer SPD not 'protect' the whole factory?

    Excuse my ignorance if this is pretty simple, but other than reading 443.4 I don't know much about the issue.

    Would it be worth getting someone in from Schneider for example to survey the factory and recommend something?




    Thank you
     
  5. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Thanks Pete, I will drop them an email tomorrow.
     
  6. Vortigern
    Offline

    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    Yes at the main DB and all sub mains. Type 1 and Type 2 at subs. You should contact Schneider. I have been through this one with a place with around 34 sub mains and yes I did need Main DB and all submains. When they saw the cost they declined.
     
  7. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    If you have an LPS then you will need to have Type 1 SPDs installed at the main incoming supplies and any other service supplie ie telephone incomer.

    Type 2 SPDs will need to be installed at DBs that are downstream. You may want to assess each DB to ascertain if the final circuits warrant SPD protection.

    In an ideal world you would want Type 1 installed at all incomers (if LPS installed) and Type 2 at every DB.
     
  8. Vortigern
    Offline

    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    What make are the DBs'? A mixture or dorman or merlin gerin as Schneider deal with them.
     
  9. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Thanks, I will investigate.

    Can we (as a company) not install SPD's? I thought it was more of a necessity now? I know the engineering manager won't want to pay if he doesn't have to.
     
  10. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Schneider, Merlin Gerin, Square D, and a few Hager, MEM etc
     
  11. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    We don't have any LPS - should we? As we don't have LPS, would it be a Type 2 at the two main incommers?

    So they don't need to be on every final circuit but at each DB?


    Thank you
     
  12. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    No. If they were your only DB then it would be fine. Type 2s need to he installed at every DB.

    If you only need to protect limited equipment then you can install Type 3 near the equipment eg a server.
     
  13. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire
    Sorry for sounding thick, but what if we don't want to protect anything? Which I know the engineering manager wouldn't want to due to cost, and the unlikeliness of needing the SPD, as he will say in his 20 years they never have?



    Thank you :)
     
  14. Vortigern
    Offline

    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    Risk assessment and value of equipment cost of downtime and so on, against cost of install. It may just be that you don't need to protect every DB.
    But of course you can install them (SPD) just you will need help for a spec. of distribution of them. Might have some probs with such a mixture of types of DB.
     
  15. chrisdicko
    Offline

    chrisdicko EF Member

    Location:
    Yorkshire

    Risk Assessment from Reg 443.5 using the formula, or just a general risk assessment, which of course could be written to negate the need for SPD's?

    We do have some expensive production machines with PLCs, Inverters etc. But I know my manager would have the thought of it never has happened, so it never will.....which I appreciate isn't the correct attitude.


    Thanks a lot for your input
     
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