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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./ j: q( f( g: J! }; w$ ]
Table 2 describes the maximum plug ratings according to the size of cord fitted.' S4 Z" } @6 ?' j
The usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
" d2 _: G4 k9 _1 e& L% J( XA 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.
" O% x( B8 ^" }+ QThe test parameters used during testing of your samples were appropriate to the usual rating of 6A.
& C8 z0 ?7 k' j) B; u% d+ f. K6 a& s: g. z! z
The purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.5 w E" c2 D9 n. S; @9 {* B" s
Table 2 gives the maximum rating of fuse according to the plug rating.! s" U3 J T3 t) B/ i
It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
! _# m6 e- |: W$ m* WThe plug must be marked with the rating of the fuse link fitted. " V* I0 r1 H8 o& _7 o
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.
! N( [) a! ?$ l; c) e(An initial higher current such as for motor starting is permitted).
/ s0 D, x3 N* |# l3 ]The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.
* O" U! X8 K# U5 ~5 ^* v$ E3 n W$ [Appliance manufacturers may have a preference for the size of fuse. |
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