Robinair Model 15505 - Manual (Page 7)

5
Consult a qualified electrician when grounding instructions are not
completely understood, or when in doubt regarding whether the product
is correctly grounded. Do not modify the plug provided; if the plug does
not fit the outlet, have an appropriate outlet installed by a qualified
electrician.
This product is for use on a nominal 120V circuit. A temporary adapter
may be used to connect this plug to a 2-pole receptacle when a correctly
grounded outlet is not available. The temporary adapter shall be used
only until a correctly grounded outlet is installed. The green colored rigid
ear, lug, or similar part extending from the adapter must be connected to
a permanent ground, such as a correctly grounded outlet box cover.
Whenever the adapter is used, it must be held in place by a metal screw.
Extension
Cords
Grounding
Instructions
contd.
Grounding Pin
Grounded
Outlet
Grounded
Outlet Box
Metal
Screw
Adapter
Tab for
Grounding
Screw
Use only a 3-wire extension cord that has a 3-blade grounding plug, and
a 3-slot receptacle that accepts the plug on the product. Verify the
extension cord is not damaged. When using an extension cord, use one
that is heavy enough to carry the current the product draws. For lengths
less than 25 ft., use 18 AWG extension cords. An undersized cord results
in a drop in line voltage, loss of power, and overheating.