B.2Dimensions of the test piece

The original gauge length ( $L_{\mathrm{o}}$ ) shall be taken as $200 \mathrm{~mm} \pm 2 \mathrm{~mm}$ or $100 \mathrm{~mm} \pm 1 \mathrm{~mm}$. The distance between the grips of the machine shall be equal to at least $L_{\mathrm{o}}+50 \mathrm{~mm}$, i.e. $250 \mathrm{~mm}$ and $150 \mathrm{~mm}$ respectively, except in the case of small diameter wires where this distance can be taken as equal to $L_{\mathrm{o}}$.

NOTE — In cases where the percentage elongation after fracture is not to be determined, a distance between the grips of at least 50 mm may be used.