UL1310 固有限制，非固有限制区别？

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1. UL1310 固有限制，非固有限制区别？
2.  什么是 energy limiting impedance？
30.2 Inherently limited
7 f9 Y( r- i6 @30.2.1 Under any condition of resistive loading – including short-circuit and interconnection of outputs
5 r, h. x' ^% m7 Q# z, owhen not prohibited by marking – the maximum output current shall not exceed the value specified in
Table 30.1 and the maximum output volt-amperes shall not be more than 100 volt-amperes, except as
$ c# e2 f" G# ]9 R4 W+ V. xindicated in 30.2.3 and 30.3.1, for the following conditions, as applicable:
4 W0 }# Q+ s! H: v9 `a) For a unit which employs a transformer with no form of protection, the measurement is to be
made 60 seconds after the unit is connected to the source of supply.
b) For a unit which employs a transformer and an energy limiting impedance or energy limiting
circuit (a resistor, a PTC device, or similar circuitry) required for the purpose (See 2.8), the
measurement is to be made five seconds after the unit is connected to the source of supply.
1 Q; N) L+ {* B6 a; ^+ d) d! Dc) For a unit which employs a transformer and either a thermal cutoff, a fuse, or both, all
- U/ X. F, t5 x( Hprotection is to be defeated during the test and the measurement made 60 seconds after the
unit is connected to the source of supply.
d) For a unit that employs a transformer and a combination of a limiting impedance or circuit
4 e$ E* d( P: n9 Trequired for the purpose, and a protective device (such as a thermal cutoff, a fuse, or both), all
protective devices are to be defeated and the measurement is to be made five seconds after
the unit is connected to the source of supply.
e) For a unit that employs a dc input, in accordance with 1.1, and a combination of a limiting
impedance or circuit required for the purpose, and a protective device (i.e. thermal cutoff, fuse,
or both), the protective device is to be defeated and the measurement is to be made five
/ m; r# ?% R8 E6 U) C& @9 h# vseconds after the unit is connected to the source of supply.

head0819

1. 固有限制--是指在短路和输出之间的内连接，最大输出电流不得超过表30.1中指定的值，并且最大输出VA不得超过100VA。
# g1 k  U) n/ z1 S  `" N+ M' H2. 非固有限制--在30.2.1中指定的最大电流和VA值不超过表30.2的值。
3. energy limiting impedance 就应该是指保险电阻，PTC。