00837nam a2200229Ia 4500 CTU_150099 210402s9999 xx 000 0 und d 93.75 621.382 W721 Williams, Noel. Limited energy systems : a guide to alarm, signaling, remote-control, and communications circuits Noel Williams. Quincy, Mass. NFPA 2002 This book primarily covers those systema and circuits using power sources that limit both voltage and current to minimize fire or shock hazards,... Electric circuits.,Electrical engineering,Remote control,Telecommunication systems Safety regulations Năm Trung tâm Học liệu Trường Đại học Cần Thơ