Some motor types will slow down. Electrical interference will greatly increase. Increased interference may affect computer and communication operations. You are out of business. For Brown-out correction see our Voltage Regulator Page.
Spikes generated by electrical machinery also greatly increase.
Air conditioners, refrigerators and other motorized devices generate local spikes. Deep Brown-out operation is discussed in the UPS operation section. Brown-out combat is mostly a case of planning ahead. A minimum preventative measure is to ensure all critical electronic and computing equipment is adequately equipped with high performance interference filters and spike suppressors. We have found that adequate spike control and interference filtering often restores marginal computer operation to satisfactory performance even in Brown-out conditions.