approximation

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2, for uninsulated wires with copper and aluminum cores, as well as wires (cables) with copper and aluminum cores (shells) having PVC, R and PET insulation, are approximately equal to 1.29 kA/[mm.sup.2] and 0.97 kA/[mm.sup.2], respectively.
Consider the widespread use of "=" for "approximately equal to," "approximates," "is similar to," and so forth.
Thus, to measure ATPs of the A- and D-components of the artificial lightning current, shunts with these coefficients approximately equal to [S.sub.iA] [approximately equal to] 11.26 x [10.sup.3] A/V and [S.sub.iA] [approximately equal to] 25 x [10.sup.3] A/V are used.
As for the duration [[tau].sub.p] of the aperiodic lightning current pulse at the level 0.5 [I.sub.mL], for our case it is approximately equal to [[tau].sub.p] [approximately equal to] 0,7 [R.sub.k] [C.sub.E] [approximately equal to]142.4 [micro]s.