Hi Amund:
Since the unit does not have grounding/earthing, it is therefore
double-insulated with respect to the input 230 volts (and must bear the
double-insulated symbol).
This requires all accessible conductive parts and accessible surfaces to be
double-insulated from the 230 volts.
If the secondary circuit has any accessible conductive parts (e.g., metal
antenna), then the secondary must be double-insulated from the 230 volts:
transformer must have two insulation layers, basic and supplementary. (This
is the most common construction.)
If the secondary has no accessible conductive parts, then the insulation
between the secondary and accessible surfaces (whether or not conductive) is
"supplementary insulation": transformer can have one insulation layer,
basic. (This is uncommon construction and will likely be not acceptable to
many certification houses.)
Good luck, and best regards,
Rich
From: Amund Westin <[email protected]>
Sent: Wednesday, February 16, 2022 1:02 PM
To: [email protected]
Subject: [PSES] Numbers of insulation layers in transformer (IEC62368)
Do I need one or two insulation layers (tape) between the primary and
secondary windings?
Can find an absolute answer in the standard IEC62368.
Product:
Input 230VAC
Secondary 24VDC for other Low volt circuits
No grounding /earthing
No cable outputs
Plastic enclosure
Radio HUB product
Thanks.
Best regards
Amund
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