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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.; ?* F2 [9 w6 o
Table 2 describes the maximum plug ratings according to the size of cord fitted.
$ Z0 |4 {2 y5 }The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
8 E4 O3 [, j7 A! T. P2 {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.) u/ J. Q; X7 m
The test parameters used during testing of your samples were appropriate to the usual rating of 6A.0 N2 g! A" k' a/ f4 X4 F# e' y
0 M+ b; o9 Y6 R! w- I/ K' x
The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.# y4 v0 _9 D o" l
Table 2 gives the maximum rating of fuse according to the plug rating.
! n7 W) {7 w) ]( BIt allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.0 J7 h6 W# ^$ P3 }
The plug must be marked with the rating of the fuse link fitted.
6 |) T; l4 F7 Z2 `7 U) D( n% iThis 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.
- i0 B& E; K8 d! Y. T' O z4 ]9 ^(An initial higher current such as for motor starting is permitted).
0 d X0 T1 n0 E" X0 s& h5 V8 gThe plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.
- q3 \% [: B d2 a! J4 M* Q; ?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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