|
We can try to explain what is permitted by BS 1363-1, even if we cannot always give the reasons for the requirements.
0 H) f8 R/ Y" D5 Z% nTable 2 describes the maximum plug ratings according to the size of cord fitted.
, ]4 m9 t" `+ kThe usual maximum rating when fitted with 0.75mm cord is 6 Amperes.
" F. ~! C. c s) wA 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. T- h& R) ]. g! L
The test parameters used during testing of your samples were appropriate to the usual rating of 6A.
4 p% f2 y4 ]* Y; d$ l; m1 E) t
: H# a8 g/ s+ V4 i. d6 o4 g, CThe purpose of the fuse in the plug is to protect the cord, not the appliance which the cord is connected to.
2 @& `, K( w% @# S. S$ iTable 2 gives the maximum rating of fuse according to the plug rating.; a, S" E0 `! p* u/ F2 h( i+ _
It allows fuses up to 13A to be used with plugs rated 6A, 10A or 13A.
) \% v+ m# G% P1 A- c/ y7 Q; U% J6 cThe plug must be marked with the rating of the fuse link fitted. N1 [$ P) s& ~, y) M
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.# ~ K9 b) Q( z
(An initial higher current such as for motor starting is permitted).8 p- o8 K0 f4 V- \+ ]* o' [
The plugs could have lower rated fuses but the marking must always show the rating of fuse fitted.
( c* e% C% Y s0 DAppliance manufacturers may have a preference for the size of fuse. |
|