Motorola Horizonmacro outdoor, Руководство по установке и настройке, Страница: 185 / 212

GSM-204-423 Pre-power up checks
31st Oct 01
Installation & Configuration: Horizon macro outdoor
68P02902W03-A
CONTROLLED INTRODUCTION
Inst. 7–5
Earth continuity
check
Ensure an earth continuity check has been performed on appropriate
equipment, if required. Use the digital multimeter to check that the resistance of
the test equipment leads is less than 0.05 ohms.
Main equipment earths
Connect the PAT tester to the earth terminal and to the following earth points:
Antenna feeders.
AC supply input earth.
– The local electricity company termination point.
– AC supply isolator.
– Number 1 ac distribution box earth terminal block.
NOTE The external switched isolator will not be connected to
earth if it is a double insulated device and will therefore
not need to be tested.
Cabinet earth/connector plates.
TMS unit chassis.
Cabinet chassis (rear right stud).
Power supply unit chassis.
Doors and lid.
Auxiliary equipment housing chassis.
Check that the measured resistance is less than 0.1 ohms with the tester
connected to a conductive surface (bare metal) at extreme ends of the earth
cables.
AC power
system
insulation
check
Ensure an insulation check has been performed on all ac power cables which
supply the site up to the ac input to the cabinet. Testing must be carried out in
accordance with the BS 7671, 16th Edition (section 713-04–01 to 713-04-06), or
IEC 364 equivalent, at the voltage levels shown in Table 7-2, using an approved
insulation tester. Check that the resistance at each point is as shown in
Table 7-2.
Table 7-2 BS7671 (16th edition) Table 71A (part of)
Parameter AC test voltage
(volts)
Minimum insulation
(megaohms)
Up to and including 500 V 500 0.5
When the test has been completed, sign the completion and inspection
certificate, a sample of which may be found in Sample form 2.