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Determining device designation of rewirable fuses

Farmboy
Table 3.1 of GN6 lists the rated short cct capacity for three BS 3036 device designations (S1A, S2A & S4A). But how do you determine the designation of the device?


On a different note, on an eicr, would you give a C2 to a size that was lower than the PEFC or PSCC at the point of use? I've looked in BPG4 and codebreakers but couldn't see anything relating specifically to breaking capacity (sorry if I've missed it).


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    AJJewsbury:

    Do you really need to? If they're in a consumer unit then the whole thing is usually rated at 16kA anyway.

       - Andy.


    Ye Olde English timber framed rewirable fuse boards are not rated to 16 kA.


    Some of the later versions with the rewirable fuse enclosed in two lumps of porcelain and the board enclosed in a steel enclosure managed a higher rating.


    Rule of thumb, if the board doesn’t look like it would take much to blow it apart, it probably won’t.


     Andy B.


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  • 0
    AJJewsbury:

    Do you really need to? If they're in a consumer unit then the whole thing is usually rated at 16kA anyway.

       - Andy.


    Ye Olde English timber framed rewirable fuse boards are not rated to 16 kA.


    Some of the later versions with the rewirable fuse enclosed in two lumps of porcelain and the board enclosed in a steel enclosure managed a higher rating.


    Rule of thumb, if the board doesn’t look like it would take much to blow it apart, it probably won’t.


     Andy B.


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