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We can try to explain what is permitted by BS 1363-1, even if we cannot always give the reasons for the requirements.
Table 2 describes the maximum plug ratings according to the size of cord fitted.
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
A rating of 10 Amperes can be assigned, provided that the cord length is no more than 2 metres and the parameters for testing at 10 Amperes are used. These are more onerous than for 6A.
The test parameters used during testing of your samples were appropriate to the usual rating of 6A.
The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.
Table 2 gives the maximum rating of fuse according to the plug rating.
It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
The plug must be marked with the rating of the fuse link fitted.
This means that your plugs with 0.75mm cord are rated 6A but could have a 13A fuse and be marked 13A, but they must not be supplied for use where the rms current exceeds 6A.
(An initial higher current such as for motor starting is permitted).
The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.
Appliance manufacturers may have a preference for the size of fuse. |
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