Grounding requirements | Electrical Installation |
Note: Note that the External Alarm Plug is black in color, matching the reciprocal black rear panel receptacle.
Figure 3-2. Alarm closure plug
Alarm Closure Plug (supplied)
Wire (not supplied)
Wire tightening screws 
(located under adapter)
Small Screwdriver
(not supplied)
3.5Grounding requirements
Due to the UL regulatory requirements, a mounting stud is required for connection of the AC input earth ground lead to the product chassis. The ground lead must be connected to the chassis using a No. 6 nut and lock washer combination. The mounting location is labeled with the IEC 417 No. 5019 symbol ( 
) to identify this as the AC earth ground connection point. This mounting stud is located next to the IEC 320 AC input connector.
The loop battery return and the FXS digital and analog circuitry must share a common ground. The access point on the back panel of the product allows connection to an external battery return lead which will be physically connected to the FXS circuit ground. This access point is provided as part of the DC power input connector.
