Installation
83
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
Fig. 22
Earthing of the communication server in the case of an direct cabling and indirect cabling
Note
In the case of an indirection connection make sure that the communica-
tion server’s earthing wire does not form any earth loops with the
earthed cable screenings of the installation cables leading up to the
(main) distribution frame. The cables should be kept as short as possible
and laid out in parallel.
Aastra
470
Aastra
470
Indirect connection
Direct connection
Copper wire yellow/
green 2,5 mm2
protected 4,0 mm2
unprotected
Copper wire yellow/ green
2,5 mm2 protected 4,0 mm2
unprotected
(Main) distribu-
tion board
Building earth
Building earth
Protective wire
Protective wire
Socket-outlet
Socket-outlet
Mains power
Mains power