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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.
+ U4 y( A, O6 ]7 R3 vTable 2 describes the maximum plug ratings according to the size of cord fitted.5 o2 g5 o* x) E
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.5 i1 I! r+ P" S% l7 o
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.
3 r4 i7 S! [' H/ u* p) lThe test parameters used during testing of your samples were appropriate to the usual rating of 6A.2 G }# g/ D+ ^9 n
9 X' ?1 d/ [8 T, _8 [6 ^
The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.
' D1 D/ q9 r/ }0 J$ L! r! ~Table 2 gives the maximum rating of fuse according to the plug rating.
T' ]" J6 P/ n9 j% r* aIt allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
% T- ^. a" I4 BThe plug must be marked with the rating of the fuse link fitted.
- B, _2 \- a2 W8 h* ~2 pThis 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., c0 f6 N) ]& V# C, i
(An initial higher current such as for motor starting is permitted).! x) Y$ i2 e8 i
The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.& x( e* L* J* L: N
Appliance manufacturers may have a preference for the size of fuse. |
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发表于 2011-11-16 23:03
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