# Question on Table 6 "Test voltages for solid insulation forming a MEANS OF PROTECTION

P

#### ps_alsa

In 60601-1 3rd Edition 2007, Table 6 shows "Test voltages for solid insulation forming a MEANS OF PROTECTION".
Voltage reference to be used is Peak Working Voltage; regarding the "Protection from Mains Part" column "One Means of patient protection" is there someone who can explain me why Test value is multplied by sqrt of 2 and summed to 1000 up to 1414 Vpk and for a reference voltage higher than 1414 this voltage is divided by sqrt of 2?
It seems for reference voltages from 1414 Vpk, calculation uses its rms Value...not so clear the reason
Paolo

Moderator
Re: Question on Table 6 "Test voltages for solid insulation forming a MEANS OF PROTEC

For a working voltage (U) above 1414V the test voltage is U divided by root 2 +2000

The figures are derived from other standards such as 60950 (IT equipment) and 60664 (insulation co-ordination) as well as retaining values from the old edition 2 version of 60601.

Check the informative rationale, at Annex A, for some more details.

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