Both multiple and series circuits may be used to
lighting used; use also depends on other design features of the system. The
circuit should be so arranged that failure of any one lamp will not leave
part of the perimeter line in darkness.
Neither should a critical or
vulnerable position be left in darkness.
Connections should be such that
normal interruptions will not hamper the system. These interruptions can be
caused by overloads, industrial accidents, and building or brush fires.
Also, lines should be placed underground or sufficiently inside the perimeter
as with overhead wiring.
This will lessen the chance of sabotage or
vandalism from outside the perimeter.
The design should require system
maintenance that is simple and economical.
It should require minimum
Cases where this occurs are in the course of routine repairs,
cleaning, and lamp replacement.