|
3.5.4Data ports for additional equipment
7 E/ W4 f2 k$ E5 }0 \5 n4 i fTo 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. b0 k) k% j# z a: ^$ d, R9 j, g
2 [- \ |3 o m6 ~; 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.+ Z6 m# V j& x! M
" L; \5 L" u7 b5 [! V6 R# }
Compliance is checked byinspection and,if necessary, bytest.
' x7 n" S# z9 U2 z
6 Q5 q- D' b+ a# Z- e8 r* Z8 H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% d" w* X! c w# t: e* x0 y
A. 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;
- t2 u2 i5 ~* {. l" `# lB. 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。
" ]/ r; @2 A+ n$ u! s/ i) q2 Q |
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
|