Markings on panelboards that employ plug-on units require the use of a hold-down kit when the units [FONT=Arial]are back-fed and the field installed supply conductors are terminated on the plug-on unit. The marking indicates: “Back-fed _____ requires hold-down kit Cat. No._____ “ or the equivalent.
An identification of the applicable back-fed unit is specified in the first
[size=3]blank-for example, circuit breaker, fused switch, or terminal kit; and the catalog number of the required hold-down kit is specified in the second blank.
Reference: UL Panelboard Marking Guide and Industry Standards
Plug-in-type overcurrent protection devices or plug-in type main lug assemblies that are back-fed and used to terminate field-installed ungrounded supply conductors shall be secured in place by an additional fastener that requires other than a pull to release the device from the mounting means on the panel.
I don’t see this “kit” in the picture?
This rule has been in the industry standards for at least 10 years, because of an electrocution…[/size][/FONT]