a)
data is in hours, if not available, data is in years
b)
time interval reduces by
20 % for compressor variants 60 Hz
(2000h./1600h., 4000h./3200h., 6000h./4800h., 8000h./6400h.,
10000h./8000h., 12000h./9600h.)
c)
Whichever occurs first: 4 years/8,000 hours
d)
Whichever occurs first:
8 years/20,000 hours