|
参考 NFPA 70 National Electrical Code® 4 o, w0 h @" n6 B2 B
# n( m4 }' s& g6 Z% D725.2 Definitions.
: I9 j4 N! s9 d1 e
# l+ h+ P$ Q8 ?0 g1 w/ g* Q( _3 rClass 2 Circuit. The portion of the wiring system between the load side of a Class 2 power source and the connected equipment. Due to its power limitations, a Class 2 circuit considers safety from a fire initiation standpoint and provides acceptable protection from electric shock.
! t y5 N' Z3 }7 X0 H$ \8 S: q. X, k# r Q. m8 y
UL1310 \. S0 S# r/ ]
2.3 CLASS 2 – A source having limited voltage and energy capacity. Requirements for voltage and2 e. e: z/ O( E; q8 T
energy capacity limitations are as indicated in this standard. See the Maximum Output Voltage Test, Section 28, and the Output Current and Power Test, Section 30. |
|