Mechanical vibration—Evaluation of machine vibration by measurements on non-rotating parts—Part 2:Land-based steam turbines and generators in excess of 50 MW with normal operating speeds of 1 500 r/min,1 800 r/min,3 000 r/min and 3 600 r/min
Electrical apparatus for the detection and measurement of flammable gases—Part 2:Performance requirements for group I apparatus indicating a volume fraction up to 5 % methane in air
Specification of flameproof three phases asynchronous motor Part 4:Series YB2 flameproof(ExdⅡCT1~T4)three phases asynchronous motor(Frame size 63 to 355)