Preparation for Use
MOBILE WORKSTATION WM-NP2
53
10.
When stopping power supply to the separation transformer, check that the remote switch is
OFF before disconnecting the transformer cable from the wall outlet socket.
NOTE
Even in ‘stand-by’ condition, the separation transformer consumes
about 4% of its rating. If it is anticipated that the system will not be used
for a significant period of time, it is recommended that transformer cable
be disconnected from the wall outlet socket to conserve energy.
4.9 Power connector
The workstation is supplied with a power cable appropriate to the model of separation transformer
fitted and the intended market area, as listed in section 7.2 - Specifications.
WARNING
• MAJ-1647 (USA): The power cord on this unit is fitted with a ‘hospital
grade’ plug. Grounding reliability can only be achieved when this
equipment is connected to an equivalent receptacle marked 'hospital
grade’.
• MAJ-1648 (RoW): The power cable on this unit is terminated in flying
leads, for a suitable plug to be fitted according to the area of intended
use. The cores of the cable are coloured in accordance with the
following code:
BROWN -
LIVE
(‘HOT’)
BLUE -
NEUTRAL
GREEN/YELLOW -
EARTH
(GROUND)
Only suitably qualified personnel should fit the power plug to
this cable.
4.10 General information
Installation of endoscopic video systems requires an understanding of the regulatory standards
relating to the safety of medical electrical systems (see NOTE below).
These standards require that systems meet the leakage current requirements of the general
medical electrical safety standard, EN IEC 60601-1/UL 60601-1, which allows a maximum earth
leakage current of 0.5mA in normal condition (0.3mA in North America).
A separation transformer is required under certain circumstances, as combined earth leakage
currents may result in excessive touch current (enclosure leakage current) under single fault
conditions, such as the interruption of a common protective earth path.
In order to meet the medical safety standard, a separation transformer will be required in a system
under one of the following conditions:
(i) Ancillary equipment that does not meet the medical leakage current requirements is
used (or could be used) within the ‘patient environment’. The separation transformer
must be used to supply the ancillary equipment, but may also be used to supply medical
electrical equipment, as long as the maximum transformer rating is not exceeded.
