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参考UL60065需要防火外壳的3个条件如下:4 A- u( T% C% L9 A, N0 v0 y
Each of the following shall be contained in a FIREEN CLOSURE:$ P& i. x& ~+ D# _
(1)circuits and their associated components where the AVAILABLE POWER exceeds 15W,! r8 I6 c, L0 P
(2)inductors and windings CONDUCTIVELY CONNECTED TO THE MAINS, and
; B! e; }; }8 V# k(3)apparatus with open circuit voltages exceeding 4kV(peak) a.c. or d.c., under normal operating conditions.The FIREEN CLOSURE shall comply with the flammability category in table 22 according to UL94 or UL746C as specified。( |/ X5 C8 a3 p1 h j/ k* e# U
基于此,首先得保证产品内部有效功率不超过15W,并且没有电感或电线绕组部件直接与MIANS连接,还有没使用正常操作条件下开路电压超过4kV(peak) a.c. or d.c的线路则可以可以使用HB材料,否则必须使用防火料,如机内包含High voltage component, 则外壳材料需要V0等级。
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对于CE(IEC60065)来说要求就低很多。只要产品没使用正常操作条件下开路电压超过4kV(peak) a.c. or d.c的线路,则可以不需防火材料.
' i+ E' _2 t7 w( e0 n% ]POTENTIAL IGNITION SOURCES with open-circuit voltages exceeding 4 kV (peak) a.c. or d.c. under normal operating conditions shall be contained in a FIRE ENCLOSURE which shall comply with the flammability category V-1 or better according to IEC 60707. |
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