|
3.5.4Data ports for additional equipment 5 P E$ q% k* g# g4 }
To limit the risk of fire in an additional equipment or accessory (for example, a scanner, mouse, keyboard, DVD drive, CD ROM drive orjoystick), SELV CIRCUITS of a data port for connection of such equipment shall be supplied by a limited power source that complies with2.5.This requirementdoes not apply if it is known that the additional equipment complieswith 4.7.
1 _; B- _, M; q6 H' K' I |% F1 `1 G5 g
NOTEIt is recommended that manufacturers of accessories and their INTERCONNECTING CABLES include protectionagainst faultcurrents up to 8A at 100VA, the maximum available from a limitedpower sourcein compliancewith Table 2B.
7 p$ x. j, h6 ]8 t3 z) U4 h: t# |( @. | O4 D1 X# |% X
Compliance is checked byinspection and,if necessary, bytest. ) O8 k3 Q6 M: J: f5 X9 l$ ]- h6 w3 r
: S, L! f' F5 _/ ], u/ s在60950里关于dataport的这段描述要求,他到底说明的是什么呢?以一个三类设备由LPS电源供电,设备上有dataport,如USB端口这样的情形为例
* q8 W! ]. E. |( S JA. 根据3.5.4的条款,只要前端LPS供电了,那连接到这样dataport的附件就不需要防火外壳,这里是不是就可以理解为这样的dataport满足了LPS,不再需要评估它了。或者理解为以下;7 K% K. @) U& G$ j4 h
B. 为了防止附件的防火危险,dataport必须满足LPS,那么不管前端是不是LPS供电,dataport都是需要评估的。: J0 b' C5 p% E) Z+ m+ c
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有账号?注册安规
x
|