Electrical news and engineering . Fig. al type of electric bread such as used in traflic regulation, industrial hot tables andparticular use is for air heating purposes. Other applicationsof the space heater or steel clad heater are in foot-warmers. * For mu(?ad beforeJectiif M h of tlie in tliis article we are-\.,. hy Mr. J. L. McK. V ndebted to a paperrdly. \Ve>linghoilse 36 THE ELECTRICAL NEWS reslauraiit srilU. lieating of water tanks, mangle shoes, andheating of [lattern plates in moulding machines. (4) Industrial oven heater. This consists of nichromeresistance ribbon
Electrical news and engineering . Fig. al type of electric bread such as used in traflic regulation, industrial hot tables andparticular use is for air heating purposes. Other applicationsof the space heater or steel clad heater are in foot-warmers. * For mu(?ad beforeJectiif M h of tlie in tliis article we are-\.,. hy Mr. J. L. McK. V ndebted to a paperrdly. \Ve>linghoilse 36 THE ELECTRICAL NEWS reslauraiit srilU. lieating of water tanks, mangle shoes, andheating of [lattern plates in moulding machines. (4) Industrial oven heater. This consists of nichromeresistance ribbon wound on fireclay insulators and mountedin a steel rack frame of open construction. The element is. Fig. 3—An enamelling oven made in various size> from l-:i/4 to .) kw. for 110/220 maximum operating temperature is around 1)00° ControlAs previously indicated, this is secured by means of thethermocouple and thermostat. For a small industrial oveninstallation a single section control panel is employed—forexample, such as for a capacity of 40 kw. or the equivalentof 120 amperes, 3 phase, 220 volts. For larger oven or fur-nace installations, individual section control panels are group-ed into a board. For example, 2,200 kw. of heaters at 550volts employed in air heating in a large cotton mill of theCanadian Cottons Company, near St. Stephens, N. B., arecontrolled from two switchboards into which the individualsections are grouped. When grouping the control in thi^way, the sectionalizing switches are usually segregated atone part of the board and the main automatic control con-tactors at another Types of Ovens (1) Electric range for the household. In conne
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