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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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    The designation refers to the breaking capacity of the fuse carrier. Final domestic circuits will almost certainly be the lowest rating. I just remembered a copy of BS3036-2 I have and the 1,2, and 4 are 1000th of the breaking capacity. Used ones are usually copper plated inside, and as Mike says should be cleaned up but from experience, this is very difficult. A C3 would probably be the correct thing, they have always been considered old but fine in operation. A C2 would indicate a change of fusegear, and there are a lot still giving good service. Unless the PSCC is very high I would choose C3.
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    The designation refers to the breaking capacity of the fuse carrier. Final domestic circuits will almost certainly be the lowest rating. I just remembered a copy of BS3036-2 I have and the 1,2, and 4 are 1000th of the breaking capacity. Used ones are usually copper plated inside, and as Mike says should be cleaned up but from experience, this is very difficult. A C3 would probably be the correct thing, they have always been considered old but fine in operation. A C2 would indicate a change of fusegear, and there are a lot still giving good service. Unless the PSCC is very high I would choose C3.
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