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The use of ac powered medical diagnostic, measurement and treatment equipment, which generates leakage currents from inappropriate grounding and electrical insulation, potentially exposes patients and even medical personnel to the risk of electric shocks, burns, internal organ damage and arrhythmia. Therefore, the insulation of medical machinery shell to do a good job.

Medical mechanical enclosures shall be constructed and sealed to prevent contact with live parts and parts that may be live under a single fault condition. If a light bulb can be replaced without a tool, it must be ensured that it is not in contact with the live parts of the lamp during loading and unloading.

The position or size of any hole in the top cover of the medical mechanical housing shall be such that the test rod with a diameter of 4mm and a length of 100mm shall not touch the live part when the whole length is freely suspended vertically into the hole. When removed handles, knobs, levers, etc, can touch control device operating mechanism of the conductor parts, should be: when communicate in open circuit test voltage is less than 50 v, test current not less than 1 a measurement, the measurement to the protective earthing resistance shall not be greater than 0.2 Ω.

Medical mechanical enclosure with more than 60 v ac or dc 25 v line voltage components, if not by outside a main switch or a can pull out the plug of the device and power supply disconnect at any time, should use additional protective cover, which can prevent the contact, even when you are in on the casing or separated from each other in space arrangement, should be clearly to make the "charged" tag.

Medical mechanical enclosures that prevent contact with live parts must be removed only with tools, or an automatic device should be used to open or remove the enclosure without these parts; When the device has a preset controller that can be adjusted by the user using a tool during normal use.