158 ____________________________________________________________
0 fu3 <u2 tu\
Ambient temperature
Fig. 4.. the size the wire and unequal
distribution the loaded circuits. In
many cases, the individual terminals can carry several times the
derated current indicated the derating curve when less than %
of the total complement used.198: Example current-carrying capacity graph
The derating factor justified because the current-carrying capacity may
be limited further external factors, e.g.
For these cases, general rules cannot established and the limits
must determined for each individual case. This curve takes into account variations specimens as
well errors temperature measurements the measuring equipment. these factors result current-
carrying capacity other than that which may expected due thermal
limitations, then revised value shall apply.
NOTE: practice, usually the case that all terminals are not
loaded simultaneously with the maximum permissible current. recommended that
the method described this standard used accordingly these
cases..197), shall specified the relevant
detail specification.Corrected current-carrying capacity curve (derating curve)
A corrected current-carrying capacity curve (derating curve), derived from
the [.] basic curve (see figure 4.
