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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.
' `5 X& z0 q5 D* u$ WTable 2 describes the maximum plug ratings according to the size of cord fitted." W% H$ @( H3 x5 _$ `; Q" f
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
2 r8 T3 b9 o9 V1 i- b+ ?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.
& x" k( R, Z6 f9 B) w2 \The test parameters used during testing of your samples were appropriate to the usual rating of 6A.) _) o0 `" `$ d" O4 T( N% T$ D
: X/ d! v% Y* F& x+ N6 aThe purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.8 I; M; d7 g+ B" E8 A
Table 2 gives the maximum rating of fuse according to the plug rating.
" B, T+ N: b2 F4 [, S @It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
, C) J+ V2 x5 h; ?The plug must be marked with the rating of the fuse link fitted.
w6 {8 y/ c! S- \2 i, w7 u& {4 vThis 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.* J$ ]* L b8 P- b9 H* ?! P
(An initial higher current such as for motor starting is permitted).& W6 ^7 L" r4 ~' v# k0 v
The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.' d; i3 d$ Z5 w
Appliance manufacturers may have a preference for the size of fuse. |
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