Apr 18, 2019 · 1 = The neutral wire of the secondary distribution system is grounded. 2 = A grounding conductor is required in the electrical cord attached to appliances. 3 = Voltage tolerance is plus or minus 4% to 9%. 4 = Voltage tolerance is plus or minus 10%. 5 Ensayo Calidad - slideshare.netTranslate this pageSep 21, 2016 · ensayo calidad 1. arely yanetsánchezlópez instituto tecnologico de tehuacan posgrado maestria en ingenieria industrial mpiin- 2011-14 tecnicas de mejoramiento de la calidad profesor:dr.