3com 10005622 Manuel D’Utilisation

A

PPENDIX

 B: S

ITE

 R

EQUIREMENTS

 

AND

 S

AFETY

 C

ODES

■

Be sure that each wiring closet has a suitable 
ground. Ground all metal racks, enclosures, boxes, 
and raceways in the closet.

■

Use AC power, 15-ampere service receptacles, type 
N5/15 or NEMA 5-15R for 120 VAC, and the other 
system specifications shown in Appendix A.

■

Be especially sure to meet all system environmental 
requirements in Appendix A, such as ambient 
temperature and humidity.

■

Be sure that the ventilation in the wiring closet is 
adequate to maintain a temperature below 40 ˚C 
(104 ˚F).

■

Install a reliable air conditioning and ventilation 
system if you plan to have two or more Switch 
3900 systems in a single wiring closet.

■

To prevent overheating during nonbusiness hours, 
guard against the ventilation being shut down 
while a Switch 3900 system remains powered up.

If you plan to mount your SuperStack II Switch 3900 
systems in a distribution rack, verify that your rack 
meets the basic mechanical and space requirements 
described in this section. 

To ensure that voltages induced into wiring by 
lightning or other disturbances are directed to 
ground, ground your distribution racks properly. Use a 
distribution rack grounding kit and a ground 
conductor that is carried back to earth or to another 
suitable building ground. To order the grounding kit, 
contact your sales representative.

Provide enough space in front of and behind the 
system so that you can service it easily. Allow a 
minimum of 76 cm (30 in.) between the rack and any 
wall behind or in front of it. Extra room on each side 
is optional. See Figure B-1.