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参考一下UL2021:
1 `& u; r4 c/ `6 n; t( v9 h+ | {15.2 Protection of wiring4 V# `8 s6 U& o: J' M5 G
15.2.1 The wiring and connections between parts of a heater shall be protected or enclosed, except that
; o5 t& E; O: G0 {1 Ga length of flexible cord may be employed for external connections, or for internal connections that may
$ ~) u$ G: N% k" a, ybe exposed during servicing, if flexibility of the wiring is essential., p; M" E. Y: @) c
15.2.2 The internal wiring of a heater in the vicinity of a lampholder that accepts either an infrared lamp
; ]! y& ]% b* w+ i' X, Bor an ordinary lamp:
- n8 _1 h8 e8 u) p( Va) Shall be a jacketed type at least equivalent to Type SP-2 flexible cord. Asbestos-insulated* Z: L* o" _( Z K4 [; {. W. I
wiring and appliance wiring material is not acceptable unless provided with sleeving or tubing.
0 V( w% a2 z; T F- }( M/ Q; vb) Shall be routed along the metal surface of the heater enclosure and shall be so secured as
" d' t S! u% L: E# Bto minimize the likelihood of its being hooked or grasped.0 g I" q/ q8 S% ^# E( J
15.2.3 A conductor utilizing beads for insulation shall not be used outside an enclosure.' e5 u$ g* S0 f$ l" h+ N
15.2.4 Internal wiring that is exposed through an opening in the enclosure of a heater is considered to be
7 C2 {/ l3 r/ \4 U( o) Mprotected as required in 15.2.1 – 15.2.3 if, when judged as though it were film-coated wire, the wiring
! a& T+ }& b0 bwould be acceptable according to 7.17– 7.20. Internal wiring within an enclosure is acceptable if, even
" ~" G a$ X+ u1 e' w/ ^4 D9 vthough it can be touched with the probe, it is so protected or guarded that it cannot be grasped or hooked$ x/ u. P X& w
in such a manner that it could be subjected to stress. |
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