XR12 Transmitter Pre-installation Manual
Issue 0.17 2005-08-31 Page vii
About safety
All Nautel transmitters are designed to meet the requirements of IEC215, Safety Requirements for Radio
Transmitters. Sequenced key interlocks are offered as an option for those customers that require them.
The philosophy of IEC215 is that the removal of any cover or panel that can only be opened using a
tool is a maintenance activity, and that any person performing a maintenance activity is expected to be
trained for that activity. Under IEC215, it is assumed that trained personnel will be knowledgeable
and will take precautions such as removing all power to the transmitter before accessing its
components.
Electrical hazards
To remove power from the transmitter, switch off and lock out the three-phase power and then wait
10 minutes for the capacitor bank to discharge. There are several ultra-brite LEDs that glow inside
the cabinet to remind anyone who has not turned off the power that the system is live and that there
is serious danger.
Mount the transmitter disconnect close to the transmitter so that it can be reached quickly in an
emergency. Clearly label the disconnect.
After turning off the power, always perform a measurement to confirm that the power is off before
touching anything within the transmitter. If the wrong breaker was opened, the equipment will be
live.
Use only a non-contact voltage probe or a safety voltmeter (available from vendors such as Fluke,
Ideal, and Teagam).
WARNING: It is not enough to push the front panel button that
removes RF power. The power line is still connected and the three
phase rectifier and the large capacitor bank is still charged and is
LETHAL. Even when the three phase power is switched off and "locked
out," the capacitor bank is still charged and requires 10 minutes to
completely discharge.
WARNING: Do not use an ordinary DVM to check for voltage, since it
may have been left inadvertently on the AMP range, triggering a short
and an arc blast that could result in severe burns and even death.
