IEC 62353:2014 pdf free download

IEC 62353:2014 pdf free download
IEC 62353:2014 pdf free download.Medical electrical equipment – Recurrent test and test after repair of medical electrical equipment
Measurements shall be performed using a measuring device able to deliver a current of at least 200 mA into 500 mΩ. The open circuit voltage shall not exceed 24 V.
While low current tests (up to 1 A) are recommended, tests using up to 25 A may be used.
NOTE For low resistance values (e.g. when larger cross sectional areas and/or shorter conductor lengths are used) higher currents used for the continuity test improve the repeatability of the test result. However, testing using higher currents might not detect earth continuity problems caused by oxidation or poor contacts.
When using direct current, the measurement shall be repeated with opposite polarity. Either value measured shall not exceed the allowable value. The highest value shall be documented.
The PROTECTIVE EARTH RESISTANCE shall not exceed the following values.
a) For ME EQUIPMENT or an ME SYSTEM with NON – DETACHABLE POWER SUPPLY CORD , the resistance between the protective earth connector of the MAINS PLUG and protectively earthed ACCESSIBLE CONDUCTIVE PARTS of the ME EQUIPMENT or ME SYSTEM shall not exceed 300 mΩ (see Figure 1 ).
b) For ME EQUIPMENT or an ME SYSTEM with DETACHABLE POWER SUPPLY CORD , the resistance between the protective earth connector of the appliance inlet and protectively earthed ACCESSIBLE CONDUCTIVE PARTS of the ME EQUIPMENT or ME SYSTEM shall not exceed 200 mΩ. For the POWER SUPPLY CORD itself, the resistance between the earth connections at each end shall not exceed 1 00 mΩ. When the DETACHABLE POWER SUPPLY CORD and the ME EQUIPMENT or ME SYSTEM are measured together, the resistance shall not exceed 300 mΩ (see Figure 1 ).
c) * In PERMANENTLY INSTALLED ME EQUIPMENT , the protective earth connection to the SUPPLY MAINS shall be tested as given in Figure 2. The resistance between the PROTECTIVE EARTH TERMINAL of the ME EQUIPMENT or ME SYSTEM and protectively earthed ACCESSIBLE CONDUCTIVE PARTS of the equipment, which may in case of a fault become live shall not exceed 300 mΩ. During the test no PROTECTIVE EARTH CONDUCTOR is disconnected. In measurements according to Figure 2, the resistance of protective earth connections in the SUPPLY MAINS may be taken into account.
d) For an ME SYSTEM with a MULTIPLE SOCKET – OUTLET , the total resistance between the protective earth connector of the MAINS PLUG of the MULTIPLE SOCKET – OUTLET and all protectively earthed ACCESSIBLE CONDUCTIVE PARTS intended to be connected to the ME SYSTEM shall not exceed 300 mΩ when connected to low-voltage TN-system installation without RCD-protection. Where RCD-protection or other protective measures, e.g. an IT power supply system, are provided, the PROTECTIVE EARTH RESISTANCE shall not exceed 500 mΩ.