Hi Chet:
IEC 61010 doesn't use the term "leakage current" (or the IEC 60990 term
"touch current.") Instead, it uses "hazardous live." The values are in
6.3.1 and 6.3.2. These same values are valid for the USA and Canada
(because there are no national differences for North America). Note
that the measurement scheme first measures the voltage (6.3.1 a); if the
voltage exceeds the respective limit, then the current is measured.
Since your product is used in a wet environment, you must use the A.4
current measuring circuit for wet location. I don't believe this is
available on the Simpson, so you will have to build your own.
If the current waveform is not sinusoidal, the peak current is applicable.
Pete and his TC108/WG5 are still working on current limits for ac riding
on dc. If you have such a current waveform, to be conservative, I
recommend using the ac peak limit. Or, you can, with an oscilloscope,
separately measure the ac and dc values and apply them to Figure 22 of
IEC 62368-1. (The limits in the IEC 62368-1 are lower than those in
IEC 61010, so you would be quite conservative.)
Good luck, and best regards,
Rich
On 7/24/2019 3:05 PM, Chester Summers wrote:
Dear colleagues—
I’m trying to get up to speed quickly with 61010-1, & need some help
interpreting the leakage current limits of IEC 61010-1 and when to
apply them.
What is the maximum allowable leakage current per UL-61010-1 for U.S.
and Canada? (the available Digital View UL-61010-1 shows only the
North American National Differences with no mention of leakage current.)
Referring to IEC 61010-1 Clauses 6.3.1 & 6.3.2, how should one
differentiate when leakage current is sine (mostly) and when “mixed
frequency”? What if there is also a significant d.c. component
present? (O’scope jacked in to Simpson leakage tester a la Pete
Perkins, okay, I understand the importance!) This seems wide open to
interpretation, with risk of third party inspector seeing things
“differently.”
The product is an outdoor optical imaging system for remote inspection
of manholes and other infrastructure below street level (wet
environment). Mains power (120V/60Hz) is taken from either onboard,
truck mounted generator or shore power connected to the truck. A pair
of 60950 approved PSU reside on the front end, with secondary side
outputs of 48VDC and lower voltages.
Thank you kindly,
Chet Summers
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