AirHarmony-4000 DC (Integrated External Duplexers) Installation Guide
UGD-D01123
Airspan Commercial and Internal Use
5
UL Information
- The equipment must be properly grounded according with NEC and other local safety code
requirements.
- Reminder to all the BWA system installers: Attention to Section 820-40 of the NEC which provides
guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected
to the grounding system of the building, as close to the point of cable entry as is practical.
- AirHarmony-4000 DC is designed to operate in environmental conditions complying with IP66 and
relevant standards.
Lightning Protection
WARNING:
The following notes are general recommendations for the system. The wireless
equipment should be installed by a qualified professional installer and must follow local and national
codes for electrical grounding and safety. Failure to meet safety requirements and/or use of non-
standard practices and procedures could result in personal injury and damage to equipment. A direct
lightning strike may cause serious damage even if these guidelines are followed.
All outdoor wireless equipment is susceptible to lightning damage from a direct hit or induced
current from a near strike. Lightning protection and grounding practices in local and national
electrical codes serve to minimize equipment damage, service outages, and serious injury. Reasons
for lightning damage are summarized as:
- Poorly grounded tower/antenna sites that can conduct high lightning strike energy into equipment.
- Lack of properly installed lightning protection equipment that can cause equipment failures from
lightning induced currents.
A lighting protection system provides a means by which the energy may enter earth without passing
through and damaging parts of a structure. A lightning protection system does not prevent lightning
from striking; it provides a means for controlling it and preventing damage by providing a low
resistance path for the discharge of energy to travel safely to ground. Improperly grounded
connections are also a source of noise that can cause sensitive equipment to malfunction.
A good tower grounding system disperses most of the surge energy from a tower strike away from
the building and equipment.
To limit the equipment damage due to a lightning strike, the following practices are recommended
for the wireless system:
- Provide direct grounding from the antenna mounting bracket, the radio and antenna and the
lightning/surge protectors to the same ground point at the base of the tower or a ground bus on the
building. Use the grounding screws on the antenna bracket and the radio and antenna for
terminating the ground wires.
- The circuit ground must be connected to the same grounding system as the eNodeB.
Outdoor Ethernet Cabling
- Ethernet cable connected to should be outdoor grade with UV protection.
- Use shielded out CAT5e (minimum) cabled terminated with metallic RJ45 connectors.
