— 防火機殼 : To minimize possibility of emission of flame, molten metal, flaming or glowing particles or flaming drops.

—   底部或隔離物:

(a)  Minimum area as indicated in Fig. 10.(Area traced out by projection, from vertical at 5° angle of every point around components openings

(b)  Either horizontal or lipped or otherwise shaped for equivalent protection.

—   下列底部結構是可以接受的: 

A – Openings of any size under

(a)   PVC, TFE, PTFE, FEP and NEOPRENE insulated wires & their connectors;

(b)             Impedance or thermally protected motors;

B – Openings in bottom, not larger than 40 mm² under V-1 parts;

C – BAFFLE construction (Fig. 11)

D – Metal bottom complying with Table XII;

E – Metal bottom screens with mesh not greater than 2mm X 2mm, with wire diameter not less than 0.45mm

燃燒特性 —

材質

V-0

V-1

V-2

平均燃燒時間

5 sec

25 sec

25 sec

燃燒時間

< 10 sec

< 30 sec

< 30 sec

燒到固定用夾子

no

no

no

引燃棉布

no

no

no (may)

材質

HBF

HB

HF-1

HF-2

燃燒時間 > 2 sec

1 sample

1 sample

燃燒時間 > 10 sec

no sample

no sample

燃燒時間 > 30 sec

no sample

no sample

燃燒距離

<40 mm/min或100 mm<燃燒距離<120 mm

<40mm/min (3mm thick)

<75mm/min (< 3 mm thick)或< 100 mm

< 60 mm

< 60 mm