TO 31S9-4-31-1 Chg 1
SERVICE UPON RECEIPT AND INSTALLATION
Section I. SITE AND SHELTER REQUIREMENTS
electrical wiring to the switch assembly will be routed
The site for the installation of balanced magnetic
through conduit, consideration must be given to efficient
switches will be preselected by direct support and
and logical routing of the conduit.
general support level maintenance personnel.
Ordinarily, a balanced magnetic switch will be installed
2-2. Shelter Requirements
on each and every window and each and every door into
Figure 2-1 shows the mounting dimensions of the
an area to be secured. Physical orientation of the switch
balanced magnetic switch. The external dimensions of
assembly on the opening to be secured will be
the assembly are given in paragraph 1-11. The switch
determined by direct support and general support level
assembly should always be installed inside the room or
maintenance personnel. External power is not required
area to be secured so that access may not be gained to
at the site for balanced magnetic switch operation, but
the switch assembly without opening the door or window
may be required for powered hand tools such as drill
on which it is installed.
motors or powered screw drivers, etc. Since the
Figure 2-1. Mounting dimensions, typical balanced magnetic switch installation.