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- Page 48 of 51 - 

 

 

 

Report No.  116366 

 

TRF No.:IECEN60950_1B 

 

 

4.5 

TABLE: Thermal requirements 

P 

 

Supply voltage (V)  .....................

264V/60Hz(adapter) 

⎯ 

Maximum measured temperature T of 
part/at:: 

T (

°C) 

Allowed 

T

max

 (

°C)

Supplied 1KHz sine wave for speakers in computer speaker system and obtain 1/8 Maximum non-clipped 
output power 

Adapter enclosure 

45.5 

81 

C2 body 

62.1 

71 

PCB near U2 

75.7 

91 

L2 body 

68.9 

91 

L3 body 

70.5 

91 

PCB near U3 and Q1 

83.9 

91 

Enclosure inside near back 

44.9 

-- 

Enclosure outside near back 

32.5 

81 

Ambient 26.0 

-- 

Having a specified maximum ambient temperature of 40°C, the maximum temperatures are calculated 
based upon a (minimum) test temperature of 26°C. Temp. limits are adjusted according to Cl. 1.4.12.3. 
Temperature limits include less 10K for thermocouple measurement method. 

Temperature T of winding: 

t

1

 (°C)

R

1

 (

Ω)

t

2

 (°C)

R

2

 (

Ω)

T (

°C) 

Allowed 

T

max

 (

°C)

Insulatio

n class

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

supplementary information: 

 

 
 

4.5.2 

TABLE: ball pressure test of thermoplastic parts 

N/A 

 allowed 

impression 

diameter (mm) .....................:

≤ 2 mm 

 

part 

test temperature 

(

°C) 

impression diameter 

(mm) 

 

 

 

supplementary information: 

 

 

 

 

- Page 49 of 51 - 

 

 

 

Report No.  116366 

 

TRF No.:IECEN60950_1B 

 

 

4.7 

TABLE: resistance to fire 

N/A 

 

part 

manufacturer of material 

type of material 

thickness 

(mm) 

flammability

class 

 

 

 

 

 

supplementary information: 

 

 

5.1 

TABLE: touch current measurement 

N/A 

 

Measured between: 

Measured  

(mA) 

Limit  

(mA) 

Comments/conditions 

Class III equipment. 

 

 

 

 

 

 

 

supplementary information: 

 

 

5.2 

TABLE: electric strength tests, impulse tests and voltage surge tests 

N/A 

 

test voltage applied between: 

test voltage (V) 

a.c. / d.c. 

breakdown 

 Yes / No 

Class III equipment. 

 

 

 

 

 

supplementary information 

 

 

 

 

- Page 50 of 51 - 

 

 

 

Report No.  116366 

 

TRF No.:IECEN60950_1B 

 

 

5.3 

TABLE: Fault condition tests 

P 

 

Ambient temperature (

°C) ...................................:  25°C 

⎯ 

 

Power source for EUT: Manufacturer, model/type, 
output rating .........................................................: 

Refer to page 41 

⎯ 

Component  

No. 

Fault 

Supply  

voltage 

 (V) 

Test time

Fuse # 

Fuse  

current  

(A) 

Observation 

U2 pin 12-35 

s-c 

264 

10min 

F1 

(inside 

adapter)

0.037 

Unit shutdown, no hazardous. 

Q1(G-S) s-c 

264 

10min 

F1 

(inside 

adapter)

0.081 

Normal operation, no 
hazardous. 

Q1(D-S) s-c 

264 

10min 

F1 

(inside 

adapter)

0.077 

Normal operation, no 
hazardous.

 

Q1(G-D) s-c 

264 

10min 

F1 

(inside 

adapter)

0.031 

Normal operation, no 
hazardous.

 

C36 s-c 

264 

10min 

F1 

(inside 

adapter)

0.03 

Unit shutdown, no hazards. 

C13 s-c 

264 

10min 

F1 

(inside 

adapter)

0.061 

Unit shutdown, no hazards. 

Speaker 
output  

s-c 264 45min F1 

(inside 

adapter)

0.347→

0.019 

Unit operated normally,  
no hazards, no damaged. Max. 
measured temp. in  
PCB near U3= 89.6°C,  
Enclosure=27.3°C,   
ambient= 25.9°C 

supplementary information: 

s-c = short circuit  

 

 

- Page 51 of 51 - 

 

 

 

Report No.  116366 

 

TRF No.:IECEN60950_1B 

 

 
 

C.2 TABLE: 

transformers 

N/A 

 

Loc. 

Tested insulation 

Working 
voltage 
peak / V 
 
(2.10.2) 

Working 
voltage 
rms / V 
 
(2.10.2) 

Required 
electric 
strength 
 
(5.2) 

Required 
clearance / 
mm 
 
(2.10.3) 

Required 
creepage 
distance / 
mm 
(2.10.4) 

Required 
distance 
thr. insul. 
 
(2.10.5) 

 

 

 

 

 

 

 

 

Loc. 
 
 
 
 

Tested insulation 

 

 

Test 
voltage/ 
V 

Measured 
clearance / 
mm 

Measured 
creepage 
dist./ mm 

Measured 
distance 
thr. insul. / 
mm; 
number of 
layers 

 

 

 

 

 

 

supplementary information: