Need help with safety compliance for a low power, 150 volt circuit inside a cell phone

Hello All: I have been asked to suggest a UL/EN 60950 compliance method for a low power, high voltage circuit that resides inside a cell phone. The circuit activates a piezo-electric transducer that physically vibrates the LCD display at about 300 Hz in 30 mS bursts to provide the sensation of a

IEC 60950-1 Ed. 2 Class A Pluggable equipment and VDR bridging basic insulation.

All: Under clause 1.5.9.4 Bridging of basic insulation by a VDR in the latest version of 60950-1 Paragraph two: Equipment with such a VDR bridging insulation shall be one of the following: - equipment that has the provision for a permanently connected PROTECTIVE EARTHING

Re: Class 2 Wiring

In message 8cd69e851445b60-1198-19...@webmail-m102.sysops.aol.com, dated Tue, 14 Dec 2010, peterh...@aol.com writes: Can anyone point me to where in the NEC book “Class 2 wiring” is defined please? I have searched the book a few times but I am unable to locate this. I see they define Class 2

RE: Class 2 Wiring

Hello Peter, Class 2 wiring is the wiring of the load side of a Class 2 circuit. Article 725.130 (B) covers “Class 2 and Class 3 Wiring Methods”. It references 725.179 which is “Listing and Marking of Class 2, Class 3 and PLTC Cables”. 725.179 states what wire types and ratings are

Class 2 Wiring

Hello all, Can anyone point me to where in the NEC book “Class 2 wiring” is defined please? I have searched the book a few times but I am unable to locate this. I see they define Class 2 circuit but not wiring. Can anyone help please? Thanks Peter -