Chapter 4 _______________________________________________________________ InstallationVAISALA _______________________________________________________________________ 35Site PreparationPower Supply and Communication LinesBefore assembling the mast, the power supply and communication linesmust be available. The primary AC power service must comply with theNational Electrical Code (NEC) or equivalent specifications forgrounding the primary power service entrance. The AC (mains) powermust be continuous, 110–230 V/50 Hz, and without spikes and blackouts.If the AC (mains) voltage is fluctuating more than the given toleranceallows, the AC (mains) voltage stabilizers are recommended.WARNING All electrical installations must be carried by licensed experts asgoverned by local and state authorities, legislation, and regulations.The following applies to all field cabling:- Use armored field cables.- Cables must be suitable for underground use.- Check the cable core diameter according to maximum allowable drop.- Route the cables through conduits to the equipment.- Check cable conduit diameters or use additional termination boxes.- Ground the cable shield at both ends.- Use spike and overvoltage protection devices at both ends of fieldcables.Always make a detailed cabling and wiring plan. Data transmission linesfrom the outdoor sites to indoor devices have to be prepared carefully.Also the power supply for the equipment used needs to be plannedcarefully.It is recommended that you use a conduit to protect the cables thatconnect the indoor components to the outdoor components from damageand moisture. Also traffic, standing water, and the twist and stress causedby the connectors will damage the cables.
