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IEC & EN 62368-1 General Introduction by Ole Morten Aaslund
IEC & EN 62368-1
General Introduction
by Ole Morten Aaslund
What is it …
• New safety standard
• Covering products currently under the scopes of
IEC & EN 60065 and 60950-1
• Components and subassemblies
• Accessories
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• Hazard based
• Technology independent
• Having its own rationale document(IEC Technical Report IEC/TR 62368-2)
What is it …
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• Not a simple merger of 60065 and 60950-1
• Not a risk-based standard
What is it NOT …
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Objectives
• Be performance based
• Type test standard
• Re-use of IEC basic standards
• Meet above in a “user friendly” manner
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Three Block Model (for pain or injury)
Hazardous
Energy
Source
Transfer
MechanismBody Part
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Three Block Model (for Safety)
Non-
Hazardous
Energy
Source
No
safeguard
required
Body Part
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Hazardous
Energy
Source
Safeguard Body Part
Levels of energy sources
Class 1
energy source
Class 2
energy source
Class 3
energy source
May be detectable, but
is not painful nor is it
likely to cause an
injury.
Ignition not likely.
May be painful, but is
not likely to cause an
injury.
Ignition possible, but
limited growth and
spread of fire.
Capable of causing an
injury.
Ignition likely, rapid
growth and spread of
fire.
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Energy source classification
• Class 1: Level 1 energy under normal and
abnormal conditions and level 2 under single fault
conditions
• Class 2: Exceeding level 1 and not exceeding
level 2 under all conditions
• Class 3: Exceeding level 2
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Energy source classification by declaration
• The manufacturer may declare a Class 1
energy source to be either a Class 2 energy
source or a Class 3 energy source
• Safeguards shall be applied according to the
declared class
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Energy source classification by declaration
• The line & neutral conductor is declared a
Class 3 electrical energy source
• A protective conductor is a Class 1 electrical
energy source and cannot be declared a higher
class energy source
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Hazards
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Hazards
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• Electric shock
• Fire
• Chemicals
• Mechanical
• Burn
• Radiation
Safety evaluation process
The limit values for determining whether
or not an energy source is hazardous are
based on IEC Basic and Group safety
publications.
The safeguard tests and parameters are
based on IEC Basic and Group safety
publications.
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IDENTIFY ENERGY
SOURCE
IDENTIFY MEANS BY WHICH
ENERGY CAN BE TRANFERRED
TO A BODYPART
DESIGN SAFEGUARD WHICH
WILL PREVENT ENERGY
TRANSFER TO A BODY PART
MEASURE SAFEGUARD
EFFECTIVENESS
IS SOURCE
HAZARDOUS?
DONE
SAFEGUARD
EFFECTIVE?
YES
NO
NO
YES
What is a safeguard?
SAFEGUARD
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Safeguard
Hazardous
Energy
Source
Supplementary
Safeguard
Basic
SafeguardBody
A BASIC SAFEGUARD is:A safeguard that is effective under normal and abnormal operating conditions whenever hazardous energy is present.
A SUPPLEMENTARY SAFEGUARD is:A safeguard that is effective in the event of a single fault of any part, including a fault of the basic safeguard.
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Safeguard
A REINFORCED SAFEGUARD is: A single, robust safeguard that is effective under normal operating conditions, abnormal operating conditions, and single fault condition.
HazardousEnergySource
Reinforced Safeguard
Body Part
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Equipment safeguard
Hazardous
energy
source
Safeguard Body part
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Installation safeguard
Hazardous
energy
source
Safeguard Body part
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Personal safeguard
Hazardous
energy
source
Safeguard Body part
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Behavioural safeguard
Hazardous
energy
source
Safeguard Body part
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• Instructional safeguard
• Precautionary safeguard
• Skill safeguard
Persons
• Ordinary person:
• Instructed person:
• Skilled person:
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Safeguard requirements – Ordinary person
Ordinary
person
Energy
class 1
Energy
class 3
Supplemental
safeguard
Basic
safeguard
Energy
class 1
Energy
class 2Basic
safeguard
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Safeguard requirements – Instructed person
Energy
class 1
Energy
class 3
Supplemental
safeguard
Basic
safeguard
Instructed
person
Energy
class 2Instruction
safeguard
Energy
class 3
Supplemental
safeguard
Basic
safeguard
Energy
class 2Instruction
safeguard
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Safeguard requirements – Skilled person
Skilled
person
Energy
class 3
Skill
safeguard
Energy
class 3
Unintentional
contact
safeguard
Energy
class 2Skill
safeguard
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Required safeguards
Required safeguards
Accessible
by:Class I
Detectable
Energy
Class 2
Painful
Energy
Class 3
Harmful
Energy
Ordinary
person
Instructed
person
Skilled
person
None Equipment
safeguard
Behaviour
safeguard
Behaviour
safeguard
Behaviour
safeguard
Equipment
safeguard
Equipment
safeguardNone
None
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