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Band I / Band II cct separation

Farmboy
Does the principal of Band I / Band II  cct separation re 528.1 apply within equipment? A DETA mechanical chime with internal transformer has LV and ELV wiring right near each other within the same enclosure (the lid of which is easily removable without tools), which seems to moot the requirement to have them separated as per the reg?


F
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    tattyinengland:

    Well consider a motor control centre where voltages of any size may be present. The controls from automation equipment and telemetry are likely to be present and cables carry no volts at all are common monitoring whether a contactor is open or closed for example. 


    I know some design goes into this to ensure some separation where possible but often it is not possible in an MCC...........- the design of which -  I'm no expert, but I think one way to enable this mixture of voltages in the same finger trunking to is ensure that what ever cables are used are rated (insulation is rated) for the highest voltage present. 


    More Knowledgeable people than me I'm sure will comment on this shortly I'm sure. 

     

    Kind Regards


    Tatty




    This is definitely the case. The difference, with respect to EMC, is the fact that EMC testing has been carried out for that application, whereas I doubt many domestic-market products have been tested for use in switchgear or controlgear assemblies, or where cables supplying them are sourced from, or routed close to, a switchgear or controlgear assembly.

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  • 0

    tattyinengland:

    Well consider a motor control centre where voltages of any size may be present. The controls from automation equipment and telemetry are likely to be present and cables carry no volts at all are common monitoring whether a contactor is open or closed for example. 


    I know some design goes into this to ensure some separation where possible but often it is not possible in an MCC...........- the design of which -  I'm no expert, but I think one way to enable this mixture of voltages in the same finger trunking to is ensure that what ever cables are used are rated (insulation is rated) for the highest voltage present. 


    More Knowledgeable people than me I'm sure will comment on this shortly I'm sure. 

     

    Kind Regards


    Tatty




    This is definitely the case. The difference, with respect to EMC, is the fact that EMC testing has been carried out for that application, whereas I doubt many domestic-market products have been tested for use in switchgear or controlgear assemblies, or where cables supplying them are sourced from, or routed close to, a switchgear or controlgear assembly.

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