Hi Amund:
If no accessible conductive parts, then you can designate the secondary
circuits as part of the primary circuits, which means there is no need for
isolation between primary and secondary circuits. No creepage or clearance
requirements! OVC would not apply primary-to-(a primary) secondary.
The plastic enclosure would probably constitute reinforced insulation
throughout. For electric shock, you would wrap in foil and measure touch
current. Should be comfortably below the limit. And, you would need to do a
dielectric test to the same foil at twice the voltage necessary for basic
insulation. Should easily pass.
I have assumed the antenna is within the enclosure so no accessible conductive
parts. If the antenna is an accessible conductive part, then the above
scenario is not valid.
Stay safe, and best regards,
Rich
From: Amund Westin <am...@westin-emission.no>
Sent: Sunday, September 12, 2021 10:16 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Creepage and clearance requirements
IEC60950-1:
How about the Creepage and clearance requirements for an AC driven radio HUB
device.
* One input: 230VAC (direct into wall socket)
* No physical output ports, just radio communication.
* Insulated plastic enclosure (UL94 V-0)
The Creepage and clearance requirements between primary and secondary circuits,
does it make any sense as long as the device has no cables and is encapsulated
by a plastic enclosure
I understand that there should be some Creepage and clearance to withstand OVC
II (250V transient).
Best regards Amund
-
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