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参考一下UL2021:
/ } S& M8 ^% r0 s! d# C1 a15.2 Protection of wiring
2 P4 w) k1 c6 y4 q* w, ~15.2.1 The wiring and connections between parts of a heater shall be protected or enclosed, except that
K4 I# f2 U& ^; a" w/ f% Za length of flexible cord may be employed for external connections, or for internal connections that may
% y3 }4 y+ w3 [# f0 e& g! S; v0 Jbe exposed during servicing, if flexibility of the wiring is essential.
# g, [4 b j7 f6 B+ K15.2.2 The internal wiring of a heater in the vicinity of a lampholder that accepts either an infrared lamp
0 u1 a+ c' o+ p! s4 j* Yor an ordinary lamp:
, Z5 Z* x; ]7 |. |: K4 F {$ S2 r @a) Shall be a jacketed type at least equivalent to Type SP-2 flexible cord. Asbestos-insulated
: h% u& O2 B+ y! Q$ x2 y8 Uwiring and appliance wiring material is not acceptable unless provided with sleeving or tubing.0 {3 R. x& d9 O, g7 F1 D
b) Shall be routed along the metal surface of the heater enclosure and shall be so secured as6 Z6 a* `' _4 M* S. j C
to minimize the likelihood of its being hooked or grasped.! g3 C8 [; c9 }9 T# ~
15.2.3 A conductor utilizing beads for insulation shall not be used outside an enclosure.
0 L6 U+ k( V. o U& V3 H; X15.2.4 Internal wiring that is exposed through an opening in the enclosure of a heater is considered to be5 X5 y0 v# Q( T, D g/ z
protected as required in 15.2.1 – 15.2.3 if, when judged as though it were film-coated wire, the wiring) k3 l3 t( a: G, u1 H# p
would be acceptable according to 7.17– 7.20. Internal wiring within an enclosure is acceptable if, even
) m% P) B- P2 E: c/ kthough it can be touched with the probe, it is so protected or guarded that it cannot be grasped or hooked# L, Z: t( t7 B
in such a manner that it could be subjected to stress. |
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