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4
Precautions
4.1
High Voltage
DANGER!
The BRU3 is powered by 120 or 230V AC. During normal operation, live
terminals or components are not accessible. If the BRU3 front cover is opened
during operation, for maintenance or commissioning purposes, live terminals or
components are exposed.
4.2
Grounding
DANGER!
Grounding must be done before the "MAIN SWITCH" on the FE Power Supply
Unit (FPU) is switched on. Before operation of the BRU3, ensure that the BRU3
is grounded in accordance with the Installation Instructions.
4.3
RF Exposure Assessment by Calculation
BRU3 base stations mounting instructions assume tower or roof mounting of
the connected antenna(s). Relevant distances for RF exposure in practice
exceed the range of the RF near-field range, thus MPE (not SAR) is addressed.
TX maximum output power is 6 W (37.8 dBm) at 100% duty cycle.
According to formula [1] below, power density at R=1 m distance is
approximately 0.048 mW / cm
antenna and ideal feed line (lossless).
BRU3 MANUAL, Doc.no: b3saf_en Uen Rev PH1, 2003-10-20
SAFETY INSTRUCTIONS
2
<< 0.6 mW / cm
2
, assuming unity gain isotropic
7 (30)
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