The grounding methods of S13 120V machine follow
the UL1017 section 11.3.1 part b) as below:
For a grounded, cord-connected appliance rated less than 15 A and
intended for use on a nominal 120-V supply circuit, the instructions in either item 1 or 2:
1) This appliance is for use on a nominal 120-V circuit, and has a grounded plug that looks like the plug
illustrated in sketch A in Figure 20. A temporary adaptor that looks like the adaptor illustrated in sketches B and
C may be used to connect this plug to a 2-pole receptacle as shown in sketch B if a properly grounded outlet is
not available. The temporary adaptor should be used only until a properly grounded outlet (sketch A) can be
installed by a qualified electrician. The green colored rigid ear, lug, or the like extending from the adaptor must
be connected to a permanent ground such as a properly grounded outlet box cover. Whenever the adaptor is
used, it must be held in place by a metal screw.
Exception: In Canada, the use of a temporary adaptor is not permitted by the Canadian
Electrical Code, C22.1.
2) This appliance is for use on a nominal 120-V circuit and has a grounding attachment plug that looks like the
plug illustrated in sketch A in Figure 20. Make sure that the appliance is connected to an outlet having the same
configuration as the plug. No adaptor should be used with this appliance.
The grounding methods of S26 120V, S26 230V, S36 120V US, S36 230V 30A AND S36
230V 50A follow the UL1017 section 11.3.1 part c) as below:
For all other grounded, cord-connected appliances:
This appliance is for use on a circuit having a nominal rating more than 120 V (or This appliance is rated more
than 15 A and is for use on a circuit having a nominal rating of 120 V) and is factory-equipped with a specific
electric cord and plug to permit connection to a proper electric circuit. Make sure that the appliance is connected
to an outlet having the same configuration as the plug. No adaptor should be used with this appliance. If the
appliance must be reconnected for use on a different type of electric circuit, the reconnection should be made
by qualified service personnel.