| Electronics > Projects, Designs, and Technical Stuff |
| Creepage/Clearance between wire wound inductor /pcb tracks |
| << < (3/4) > >> |
| TimNJ:
Yeah just to reiterate...on this dark side of the electronics world, you can't just say, "We tested it and it works!" with regards to mains safety insulation/isolation. If there's a component/material intended to serve as a means of protection, then it has to be UL approved material compatible with the insulation system used by the inductor. |
| Neilm:
--- Quote from: TimNJ on October 25, 2019, 01:33:37 pm ---Yeah just to reiterate...on this dark side of the electronics world, you can't just say, "We tested it and it works!" with regards to mains safety insulation/isolation. If there's a component/material intended to serve as a means of protection, then it has to be UL approved material compatible with the insulation system used by the inductor. --- End quote --- The test I use when I am making decisions like on safety like this - "would I feel comfortable explaining that in court to a new widow?" |
| ZaphodBeeblebrox:
Soldermask can indeed not be regarded as insulation. I advise to place an extra layer of insulation in between the PCB and the component. Mind that outside of the US, other regulations than UL apply. For example glow wire requirements (especially if you're aiming for the 60335) and comparative tracking index of the material used influence which materials are appropriate or not. |
| jonpaul:
Hello all If the 250 VAC is power mains connected, the creep and strike insulation hypot must be compliant with the applicable safety regulations, UL, VDE, EU, etc. Neither solder mask, nor magnet wire insulation are safety rated. Notice that the peak transients on a power line can be several KV, line to earth. So this design seems to be marginal. Suggest that you add an additional insulation eg 5 mil mylar or kynar. Just the ramblings of a retired EE Jon |
| max_torque:
--- Quote from: Neilm on October 25, 2019, 05:03:42 pm --- --- Quote from: TimNJ on October 25, 2019, 01:33:37 pm ---Yeah just to reiterate...on this dark side of the electronics world, you can't just say, "We tested it and it works!" with regards to mains safety insulation/isolation. If there's a component/material intended to serve as a means of protection, then it has to be UL approved material compatible with the insulation system used by the inductor. --- End quote --- The test I use when I am making decisions like on safety like this - "would I feel comfortable explaining that in court to a new widow?" --- End quote --- In this case, the insulation in question is not safety insulation, but functional. In the event of a short, the only effect will be a loss of function and not HV getting somewhere it shouldn't! However, for the minimal cost i'll add a extra layer of something, i just need to decide what the best 'something' actually is :-DD |
| Navigation |
| Message Index |
| Next page |
| Previous page |