UL1310 固有限制，非固有限制区别？
1. UL1310 固有限制，非固有限制区别？2.什么是 energy limiting impedance？
30.2 Inherently limited
30.2.1 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
Table 30.1 and the maximum output volt-amperes shall not be more than 100 volt-amperes, except as
indicated in 30.2.3 and 30.3.1, for the following conditions, as applicable:
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.
c) For a unit which employs a transformer and either a thermal cutoff, a fuse, or both, all
protection 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
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
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
seconds after the unit is connected to the source of supply.
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。
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