CS680 - JBL Audio EMC - CB Certificate (repair manual). Page 37

 
 

page 33 of 34 

Ref.No.:610604  

IEC 60065 

Clause 

Requirement - Test 

Result - Remark 

Verdict 

 

 

TRF No.: I60065__C 

16.3b 

(16.4b) 

 

Delete “Subclause 3.1 of IEC Publication 60227-2: Part 

2: Test Methods“ and insert “Subclause 9.1 of SS 236“:

9.1 Flexing test (except for tinsel cords, twisted twin 

and single core cords). The test shall be carried out  by 

means of the apparatus shown in Figure 5. This 

apparatus has a carrier C supporting two pulleys A and 

B arranged so that the cord is horizontal between the 

pulleys. The carrier moves backward and forward over 

a distance of 1 m at an approximately constant speed 

of 0.33 m/s.                                    

A sample of flexible cord about 5 m long shall be 

stretched over the pulleys as shown in the figure, each 

end being loaded with a weight. The weight and the 

diameter of the pulleys A and B shall be given in Table 

1. 

Screened cords in accordance with Table 7 shall be 
tested before application of the screen and outer 
sheath.                                                 

The pulleys shall have a semi-circular shaped groove 
for circular cords and a flat groove for parallel twin 
cords. The restraining clamps D shall be fixed so that 
the pull is always applied by the weight from which the 
carrier is moving away. The carrier shall make 30 000 
backward and forward movements (60 000 single 
strokes). Each conductor of the sample shall be loaded 
with the current specified in Table 2.                             

For twin cords and for light PVC-sheated 3-core cords, 
the voltage between the conductors shall be 
approximately 230 V a.c. For all other cords having 
three or more cores a three-phase a.c. voltage of about 
400 V shall be applied to three conductors, any 
additional conductors being connected to the neutral.     

During the test no open-circuit in any core or short-
circuit between cores shall occur.                                     

After the test, any sheath on cords having three or 

more cores shall be removed. The cord, or the laid up 

cores, shall then withstand the voltage test specified in 

Subclause 8.2 or 8.3 as appropriate, but with a test 

voltage not exceeding 2000 V. 

TABLE 1, TABLE 2, FIGURES 4 and  5, see the       

CB BULLETIN 

 P