I agree: this is a very good explanation.
On 2024-11-12 18:54, Ted Eckert wrote:
Hi Amund,
Let me expand a bit on the answer James Pawson gave.
Skilled personnel have the training and skill to both identify hazards
and know how to protect themselves from those hazards.
Let me start with an electric shock example. A licensed electrician
should know how to determine what the highest voltages in a system
will be and where they will be located. That person should know what
personal protective equipment, tools, and procedures are required to
safely work with that equipment. They are trained on how to deenergize
and lock out equipment, and where necessary, work with energized
equipment.
What training would you give somebody to look at a system and identify
creepage and clearance distances below the minimum specified in the
safety standard? What protection would a skilled person use to protect
themselves? Reduced spacings can create arc and fire risks, and these
can present a hazard to not only the personnel working with the
equipment, but anybody in the area. If reduction of levels of safety
creates a fire risk, does it pose a hazard to others?
IEC 62368-1 lists the different energy classes for thermal hazards,
electrical shock, radiation hazards, etc. However, some attributes,
such as spacing and selection of flammability ratings of materials do
not have those three energy classes. There are fixed requirements.
These requirements must be met as they protect from hazards that
training of personnel would not necessarily provide protection.
Ted Eckert
The opinions expressed are my own and do not necessarily reflect those
of my employer or IEC TC 108.
------------------------------------------------------------------------
*From:* Amund Westin <[email protected]>
*Sent:* Monday, November 11, 2024 10:20 PM
*To:* [email protected] <[email protected]>
*Subject:* [EXTERNAL] [PSES] Safeguard - Skilled person
IEC TR 62368-2:2019:, Ch.4.3.4 “Safeguards for protection of a skilled
person”, table 1:
Skilled persons require 0 safeguard to Class 3 energy source.
Does this requirement make influence on the creepage and clearance
distances?
BR Amund
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Keep trying
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