Nadcap (formerly NADCAP, the National Aerospace and Defense Contractors Accreditation Program) is a global cooperative accreditation program for aerospace engineering, defense and related industries.
Range - Hi and Lo Broil. The Broil Hi-Lo pad gives you the capability of reducing the oven temperature during the broil function. It is featured on most electronic model ovens. Hi Broil: Functions at 550 degrees Fahrenheit. It gives a quicker broiling to sear in natural food juices. Lo Broil: Functions at 450 degrees Fahrenheit. It gives a slower broiling to ensure doneness without drying out the food. Broil: Some ovens have Broil only, which functions at 550 degrees Fahrenheit. Note: On gas models, the gas flame height is the same for Hi and Lo Broil. The flame will cycle off more often when set to Lo Broil.
Its actually just an average temperature. When you set the oven to say 350, both the Bake Element at full power (220 volts) & the Broil Element at half power (110 volts, not all ranges use the broil element but most do) or if a gas range the oven burner comes on and starts to heat the oven to the desired temperature.