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24.3 The bases of surface type socket-outlets are first fixed to a cylinder of rigid steel sheet,: Q6 s& P0 v6 Z% p3 }
having a radius equal to 4,5 times the distance between fixing holes but, in any case, no less1 m* o- l. t! n1 ?0 ~ b
then 200 mm. The axes of the holes are in a plane perpendicular to the axis of the cylinder9 p! J+ r2 R- ]3 Y" j0 _, j6 P O
and parallel to the radius through the centre of the distance between the holes.& g0 U* v8 q/ B5 X$ H- s! X
The fixing screws of the base are gradually tightened, the maximum torque applied being' L& `, U* o; T$ G8 c. P
0,5 Nm for screws having a thread diameter up to and including 3 mm and 1,2 Nm for screws
. V" v! i! p- Ghaving a larger thread diameter.4 l& F. [$ F! M0 [# G0 Q$ U0 [
The bases of socket-outlets are then fixed in a similar manner to a flat steel sheet.* \) G3 s0 }1 s% X* c' ]6 H( v. ]
; I x0 E4 J f% ?' H8 y问题:这个试验装置是什么样的?
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