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？
4 Q  x9 r2 L4 H" T1 }$ |  a30.2 Inherently limited
" Q" }) s# X; i30.2.1 Under any condition of resistive loading – including short-circuit and interconnection of outputs
when not prohibited by marking – the maximum output current shall not exceed the value specified in
% c1 A% Y+ d  Y* L0 xTable 30.1 and the maximum output volt-amperes shall not be more than 100 volt-amperes, except as
6 H8 A$ @! K* d; \& i$ A! f$ windicated in 30.2.3 and 30.3.1, for the following conditions, as applicable:
1 b3 w- u2 O, u! ?) i7 w  `a) For a unit which employs a transformer with no form of protection, the measurement is to be
1 k- G+ O3 K; S+ [- U( F* ymade 60 seconds after the unit is connected to the source of supply.
, [* `, h  E" e/ X2 ]0 Nb) For a unit which employs a transformer and an energy limiting impedance or energy limiting
* g% S2 o! ^9 N4 g4 ]- Y+ Wcircuit (a resistor, a PTC device, or similar circuitry) required for the purpose (See 2.8), the
" M. _! _" X3 t. Pmeasurement is to be made five seconds after the unit is connected to the source of supply.
c) For a unit which employs a transformer and either a thermal cutoff, a fuse, or both, all
4 h& i+ M" V% _* y+ x& Uprotection is to be defeated during the test and the measurement made 60 seconds after the
unit is connected to the source of supply.
% S& i4 E; b, Od) For a unit that employs a transformer and a combination of a limiting impedance or circuit
required 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
* e, P' j* f8 b' ]1 E/ zthe unit is connected to the source of supply.
& M* F4 _+ v; O+ c) {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,
- a: K  _1 {# }2 q6 Nor both), the protective device is to be defeated and the measurement is to be made five
& o/ V8 \& w6 tseconds after the unit is connected to the source of supply.
) G% {+ s' |9 Z: w. ?. ~4 t

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。
2. 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。