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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.3 _3 A& U' {: l; `
Table 2 describes the maximum plug ratings according to the size of cord fitted.9 b+ }0 D2 W4 @7 [" t
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
7 u8 J9 U; n- c0 R1 P& oA 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.5 ]* ^. i% D2 C& O/ e! V
The test parameters used during testing of your samples were appropriate to the usual rating of 6A.! S% ^3 i9 W; e8 Z) F
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The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.
, ?* B+ [. z) Z# Z8 u1 FTable 2 gives the maximum rating of fuse according to the plug rating.0 v% D! J& G7 W1 l4 Q' A4 G
It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
4 |* V* f* h8 E* j4 yThe plug must be marked with the rating of the fuse link fitted. 5 O* @2 B. B3 m% Z( z* Y( \
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.
6 O+ l" z/ W- r- w% o) X" E, [4 X(An initial higher current such as for motor starting is permitted).
" [+ s& W. j8 g VThe plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.( | \% e! m4 ?" B8 y' k" y" \
Appliance manufacturers may have a preference for the size of fuse. |
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