iec & en 62368-1 general introduction...iec & en 60065 and 60950-1 •components and...

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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Questions?

info@nemko.com

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