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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.2 l# {2 f" e5 M7 _7 Y) v
Table 2 describes the maximum plug ratings according to the size of cord fitted.. _; h8 s" I0 ~
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
$ s3 {) F7 {, t& L @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.
9 Q; |, T9 |) w- w7 G4 |+ \The test parameters used during testing of your samples were appropriate to the usual rating of 6A.
# l$ Q8 E$ @+ n6 H! E: l- |& P. R# J* P6 L: h* F4 y
The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.5 G# k8 b0 t" ^6 N
Table 2 gives the maximum rating of fuse according to the plug rating.
6 k! y/ Y% p1 lIt allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.$ ^. A7 s+ e2 f! l" f4 D
The plug must be marked with the rating of the fuse link fitted.
8 B9 t& B$ i3 p( lThis 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.
7 j R& d2 U4 I0 W( F9 j5 @1 I0 U(An initial higher current such as for motor starting is permitted).! n; a2 S1 _1 U. I. K
The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.' u+ _& O6 c1 m) M3 N( O
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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