What do I need to know about the 20 ampere plugs on the Quick 220 Power Tap?

• The Quick 220 Power Tap's 20 ampere versions come with 20 ampere 110/120 volt plugs. Adapter cords are available so the 20 ampere systems may be used with 15 ampere outlets. These adapters are rated for loads of 15 amperes and less. Blade patterns for 15 ampere and for 20 ampere plugs are shown below with the prongs toward and the cord away from the viewer. 15 A 20 A (NEMA 5-15) (NEMA 5-20) 110/120 Volt Plugs • The 3 prong outlet commonly found in homes is rated at 15 amperes even though the circuit may be 20 amperes. The 20 ampere outlet is commonly found in commercial buildings; one of the slots is shaped like a "T" to accept both 15 and 20 ampere plugs. Here is a diagram showing the blade configuration of a 20 ampere outlet: NEMA 5-20R • Use of the 20 ampere plug with the 20 ampere Quick 220 Power Tap is necessary to meet U.S. and Canadian electrical standards.  more