Table 4 shows the maximum amperage per circuit for various gauges of field wiring brought to heaters having one through eight circuits. Heaters ordered with additional circuits, of for higher fluid temperatures will by furnished with conduit openings and terminals to accommodate the wire gauges shown in Table 4. Occasionally low KW heaters operate from single phase power. In this case, omit the 1.73 factor in the above formula. The gasket is sized to match the seating surface on the flange.
Spirotallic gaskets are also available.
Although pipe flanges have nominal ratings, the actual pressure that they will safely withstand is a function of temperature. Table 5 below shows pressure ratings per ANSI Standard 1316.5. D., providing extra electrical insulation for superior dielectric strength. As a result, elements are suitable for line voltages up to 600 volts. At the same time, uniform heat transfer from coil to sheath is assured by compacting the insulation in high pressure carbide rollers, then repressing all bends to insure insulation integrity in this critical area.