RE point number 4: This is OK if the peak voltage is too low to ionize
the air. If it isn't, the ionized air will eat the insulation and
breakdown is guaranteed, maybe with flames and smoke. One of the first
'banana skins' I witnessed in 1958: my colleagues has encased a
horizontal scan output transformer EHT winding in polythene. It didn't work.
On 2024-11-11 21:27, Richard Nute wrote:
Hi Amund:
1. Plane separation.
1. No air insulation between planes: No clearance and creepage
requirements: the planes can be adjacent.
2. Air insulation between planes: The planes must be separated
by clearance and creepage requirements.
2. Edges of the PCB.
1. AC plane does not extend to the edge of the PCB: No clearance
and creepage requirements.
2. AC plane extends to the edge of the PCB: Clearance and
creepage dimensions are required.
3. Through-holes.
1. Solid insulation between the AC plane and the through-hole
conductor: No clearance and creepage requirements.
2. Air insulation between the through-hole conductor and the AC
plane: The separation must meet clearance and creepage
requirements.
4. Solid-air series construction.
1. Such construction constitutes a capacitive voltage divider.
Most of the voltage is across the air insulation. However, the
solid insulation most likely has more than adequate electric
strength. The air can be ignored.
Best regards,
Rich
*From:* Amund Westin <[email protected]>
*Sent:* Monday, November 11, 2024 4:38 AM
*To:* [email protected]
*Subject:* [PSES] SV: [PSES] SV: [PSES] Creepage Live-Ground
In other words, is it allowed to have GND and LIVE in adjacent PCB layers?
BR
Amund
*Fra:*Amund Westin
*Sendt:* 11. november 2024 10:25
*Til:* [email protected] <mailto:[email protected]>
*Emne:* [PSES] SV: [PSES] Creepage Live-Ground
Ref. picture below … would the clearance be different in a case if we
had a solid ground plane and solid LIVE AC plane on a PCB? Let’s say
the planes were layer 2 and 3 in a 4-layer PCB.
There must be some connection point to both layers, which could look
like the picture below, but let’s say the there is a connection area
on the PCB where the GND and LIVE are >> 20mm from each other. But the
two layers are maybe 0.5mm from each other.
BR
Amund
*Fra:*Amund Westin
*Sendt:* 5. november 2024 14:51
*Til:* [email protected] <mailto:[email protected]>
*Emne:* [PSES] Creepage Live-Ground
Pin with 230VAC through the FR4 PCB with spacing to the inner ground
plane.
_Creepage_: Which table in the EN 62368-1:2020 apply?
BR
Amund
------------------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to [email protected] <mailto:[email protected]>
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
<https://www.mail-archive.com/[email protected]/%20>
Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/>
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how
to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html>
List rules: https://ewh.ieee.org/soc/pses/listrules.html
<https://ewh.ieee.org/soc/pses/listrules.html>
For help, send mail to the list administrators:
Mike Sherman at: [email protected] <mailto:[email protected]>
Rick Linford at: [email protected] <mailto:[email protected]>
For policy questions, send mail to:
Jim Bacher at: [email protected] <mailto:[email protected]>
------------------------------------------------------------------------
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
<https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1>
------------------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to [email protected] <mailto:[email protected]>
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
<https://www.mail-archive.com/[email protected]/%20>
Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/>
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how
to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html>
List rules: https://ewh.ieee.org/soc/pses/listrules.html
<https://ewh.ieee.org/soc/pses/listrules.html>
For help, send mail to the list administrators:
Mike Sherman at: [email protected] <mailto:[email protected]>
Rick Linford at: [email protected] <mailto:[email protected]>
For policy questions, send mail to:
Jim Bacher at: [email protected] <mailto:[email protected]>
------------------------------------------------------------------------
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
<https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1>
------------------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to [email protected]
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
<https://www.mail-archive.com/[email protected]/%20>
Website: https://ewh.ieee.org/soc/pses/
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how
to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html>
List rules: https://ewh.ieee.org/soc/pses/listrules.html
For help, send mail to the list administrators:
Mike Sherman at: [email protected]
Rick Linford at: [email protected]
For policy questions, send mail to:
Jim Bacher at: [email protected]
------------------------------------------------------------------------
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
<https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1>
------------------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to [email protected]
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
Website: https://ewh.ieee.org/soc/pses/
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how
to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html>
List rules: https://ewh.ieee.org/soc/pses/listrules.html
For help, send mail to the list administrators:
Mike Sherman at: [email protected]
Rick Linford at: [email protected]
For policy questions, send mail to:
Jim Bacher at: [email protected]
------------------------------------------------------------------------
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
--
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying
--
This email has been checked for viruses by AVG antivirus software.
www.avg.com
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
[email protected]
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
Website: https://ewh.ieee.org/soc/pses/
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to
unsubscribe)
List rules: https://ewh.ieee.org/soc/pses/listrules.html
For help, send mail to the list administrators:
Mike Sherman at: [email protected]
Rick Linford at: [email protected]
For policy questions, send mail to:
Jim Bacher: <[email protected]>
_________________________________________________
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
