|
本帖最后由 passagere 于 2016-7-29 22:51 编辑
% b, {1 w% p8 [) I' xgmr24185 发表于 2016-7-29 20:12 5 y; p8 @: W6 J' Q4 j
我再请问,既然芯线外皮颜色改为了红黑,线径我可以做小吗?小于18AWG?. h7 F7 Q7 E- R5 K6 }
谢谢 , e) b, s1 L! T* [6 \% h& B
可以的,以下是8750的内容:
) Z" W( A6 s- c9 z# \" u% S7.4.4 Leads, terminals, and connectors for other than branch circuit connections
( o! V9 w1 d6 D( z8 {: N7.4.4.2.1 Input and output leads shall comply with the requirements for internal wiring of 7.3 and be of& P+ u1 Z7 f+ v; Z& U, {
sufficient length to allow for the intended connection.
# \ t+ J3 I2 r% e9 N5 M) ^
4 ]# I# f8 ?4 j& b- b
7 ]; b; t4 ]* A% A8 {7.3 Internal wiring
! w5 _9 ?0 N+ w3 L1 {. F7.3.5 Conductors shall be minimum 18 AWG (0.82 mm2), except as specified in 7.3.6 and 7.3.7, and shall be rated for the voltage, current, temperature, and conditions of service for normal operation.2 H5 c9 Q9 B c. Y& t4 R
& F |' x! Z+ D/ r; C; V7.3.6 Conductors of a size smaller than 18 AWG (0.82 mm2) but no smaller than 24 AWG (0.21 mm2)3 P9 s# [4 x" |, j0 z
are permitted under the following conditions:
% I4 b5 s( Y- ~! Y, a( h: q" Fa) Where completely enclosed,
! m- C+ d* c w) a5 pb) Where not subject to movement under normal use, and
$ Q- u3 B$ K! jc) In the secondary of a transformer or in a circuit containing solid-state devices.( F0 d7 w4 L5 k* V) ~! c; j
9 p+ o5 t& s) m, G2 l& L
7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
$ D; l: M2 _- K! L' Oonly and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a- @: I: i6 o: }) y1 F' V; M+ y6 \
barrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).3 [2 R- p' X" Y8 g1 W: z9 L
4 }% c; k" e/ E9 A2 y
& F/ \- h9 a* m! @3 _0 m/ u! }最终,按7.3.7的条款来看,只要保证其他使用条件即可。另,此线如果外露的话,要考虑满足抗拉强度。' H9 a) m5 J9 a8 W% } R6 |: a
|
|