Brian, et al
Low current protection devices are intended to protect people.
The long term letgo-immobilization current of 5mA covers the
full population and opens any circuit which exceeds this level (ok, the UL
limit for GFCIs is 4mA to 6
I am scoping the requirements for a pole mounted real time energy monitor,
mounted near a pole mounted street transformer (11kV-240VAC).
The core product is a DIN rail energy meter with
* Neutral and three phase inputs,
* no Earth connection
* Three CTs, suitable for install on the overhead wires
In North America, GFCIs are only used in wet environments; kitchens, bathrooms,
garages, outdoor outlets and such. They are neither require nor used for other
occupancies. There are exemptions to reduce the risk of nuisance tripping. If
you want to keep a refrigerator or freezer in your garage,
We have an expert on electric shock here, so I won't go further than to
say that the effect of 30 mA depends very much on how much contact area
there is, where it is and for how long contact lasts. I am surprised
that 6 mA doesn't result in nuisance tripping.
John Woodgate OOO-Own Opinions
My understanding isn’t as clear as I would like it to be, so the information I
am providing is suspect.
I believe that the difference in trip points between North America and Europe
is due to grounding, wiring and power distribution practices. The power
distribution systems used in North
Agreed, and current carry-carrying of PE and bonding of internal parts must
meet stringent UL/CSA requirements. (not mA!) It seems to me that 30mA is
close to lethal, and the GFCI outlets Listed over here are 6mA trip. (still a
painful shock)
Ralph McDiarmid
Product Compliance Specialist
I don't think that is the reason recognized in Europe. The PE circuit
has the same (or similar) current-carrying capacity as the line
circuit(s), so its fault-current capacity for 30 s is very large even
for a household supply. I think the protector is there to prevent fire
and to give some
I’ve recently come to understand that the 30mA Ground-Fault protectors, often
built into a circuit breaker, is intended to protect the Protective Earth
(Safety Ground) circuit in the case of a short circuit (opening the circuit
before the safety ground could be damaged. It this correct?
Here
From the public part of the IEC web site, the FDIS is still at editing
check, so hasn't been circulated yet. To find Previews, go to www.iec.ch
and open Webstore. There is a list of available pre-releases (PRV
documents).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Hi all,
Given IEC 62368-1, 3rd ed has passed the Committee Draft for Voting (CDV) stage
in Oct 2017, may I know where can we get a copy of IEC 62368-1, 3rd edition
Final Draft International Std (FDIS) for preview ?
Hope to hear from you soon. Thank you.Vincent
-
Good afternoon.
Just received this info email from Intertek in the UK, followed the link and
downloaded the White Paper – it should be of interest to anyone who wants to
know the changes and additions.
Adds quite a number of requirements, such as for socket-outlets with built-in
USB
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