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As the only lattice vector current that does not require renormalisation isthe point-split conserved current it is convenient to have a robust, preciseand computationally cheap methodology for the calculation of vector currentrenormalisation factors, $Z_V$. Momentum subtraction schemes, such as RI-SMOM,implemented nonperturbatively on the lattice provide such a method if it can beshown that the systematic errors, e.g. from condensates, are well controlled.  We present $Z_V$ calculations for the conserved current in both the RI-SMOMand RI$'$-MOM momentum subtraction schemes as well as local currentrenormalisation in the RI-SMOM scheme. By performing these calculations atvarious values of the momentum scale $\mu$ and different lattice spacings wecan investigate the presence of power suppressed nonperturbative contributionsand compare the results to expectations arising from the Ward-Takahashiidentity. Our results show that the RI-SMOM scheme provides a well controlleddetermination of $Z_V$ but the standard RI$'$-MOM scheme does not.  We then present some preliminary uses of these $Z_V$ calculations in charmphysics.

Vector current renormalisation in momentum subtraction schemes using the HISQ action