I think you analysis is correct.
On 2024-02-26 13:38, James Pawson (U3C) wrote:
Hello all,
I hope this safety question is a fairly simple one for you, it being
Monday after all…
1. A piece of equipment with a power supply output for driving a
lamp. It has two modes, DC and pulsed.
2. Both of the output voltage connections are on accessible terminals
(checked using finger probe)
3. Classifying voltages as per EN 61010-1 clause 6.3.1 (limit values
for accessible parts, normal operating conditions)
4. DC mode runs at 46Vdc maximum. This is less than 60Vdc so is not
Hazardous Live
5. Pulse mode runs at 46Vdc pulsed (frequency up to 1kHz, duty cycle
can vary down to 0.01%) which is an AC waveform greater than 42.4V
peak so is Hazardous Live
6. The output from the equipment is low impedance so is more than
capable of sourcing the required 0.7mA through the IEC 60990 body
model.
Quick sketch attached to illustrate the concept. I even ran a SPICE
simulation to make sure I wasn’t getting something wrong.
I would appreciate the sanity check!
**
All the best
James
James Pawson
Managing Director & EMC Problem Solver
*Unit 3 Compliance Ltd*
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Best wishes
John Woodgate, Rayleigh, Essex UK
Keep trying
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