Rmano

\documentclass[border=10pt]{standalone}
\usepackage[RPvoltages]{circuitikz}
\usetikzlibrary{fpu}
\makeatletter
\pgfqkeys{/pgf}{
    fpu/install only/.code={
        \pgfmath@warning{The key `/pgf/fpu/install only' is experimental and might %
            change or disappear at any point!}%
        \edef\pgf@list{#1}%
        \pgfutil@for\pgf@temp:=\pgf@list\do{%