I've had personal experience with lightning coupled transients to the
secondary, strong enough to burn out an office Mr Coffee pot.
Interestingly, if you have a transformer in the coupling path and the
windings are oriented to normally invert a sine wave, the transient will
likely not be inverted.
Hi Steve:
Mains circuits are subject to lightning and switching transients both
line-to-neutral and line/neutral-to-ground. The transients are normal; to
prevent insulation breakdown and consequential electric shock, the electric
strength of mains-to-ground and mains-to-other
For those keeping score at home on when the UKCA 2yr extension legislation is
actually passed, this is how I am tracking
Goto https://commonsbusiness.parliament.uk/
Click on HTML or PDF version of "Daily Order Paper" in the "Today's business
papers" section.
Search on "Metrology" and you
Sorry, a word missing:
, if your best efforts to find a documented rationale to not apply the
requirement FAIL,
==
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear,
Very good advice. There is a 'dumb' fallback, if your best efforts to
find a documented rationale to not apply the requirement, is to consider
how much extra it costs to comply with it, compared to the cost of
trying to find a reason not to comply with it.
For example, I found that replacing
Hi Steve:
I work mostly with the 60950-1 and 62368-1 standards for ITE, so I’m not
familiar with the details of the requirements in 61010-1.
That being said, I’ve seen many cases where someone misinterpreted the
creepage/clearance/dielectric requirements in 60950-1 and 62368-1, not
The simple answer is that you need to provide creepage and clearance
distances in secondary circuits to avoid arcing when the circuit is
subjected to the absolute worst case surges and transients that the circuit
might see. Since this can be difficult to determine, most people just use
the tables
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