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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.
, W- j: ~" ^( L v$ ~8 KTable 2 describes the maximum plug ratings according to the size of cord fitted. } {2 ^7 \: C- V- y/ ^- y, ^
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.$ {- b) y5 J! S, d# w4 I( I
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.
Q$ H1 G6 F3 \4 m. MThe test parameters used during testing of your samples were appropriate to the usual rating of 6A.
5 A4 V/ @% r! i l
9 v; b) I0 S* {7 P: rThe purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.' ^" }, {# k' _" f6 K$ Y6 O Y3 o
Table 2 gives the maximum rating of fuse according to the plug rating.* [& n' l* b# Q7 t! P' W
It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
* w. m; T' {* o5 f6 zThe plug must be marked with the rating of the fuse link fitted. ! q+ Z3 L: X, G8 w
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.1 {- \5 x; L) Y' j0 f/ r
(An initial higher current such as for motor starting is permitted).
4 K2 P% g$ [$ b; T7 _$ Y. mThe plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.
$ \& M0 ?: o4 B. K: A% IAppliance 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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