New luminaire isolation requirements IEC 60598-1 Content

Sjef Jansen

Category LED Systems

June 17, 2013

New luminaire isolation requirements

IEC 60598-1

Content

• Introduction and background to electrical safety

• Changes luminaire safety standard IEC 60598-1: new draft edition

• Consequence for luminaire designs

• Two practical examples

• Philips LED Systems portfolio compliance

• Conclusions

• Follow-up and support

• Q&A

2

Introduction to safety

• Safety is protection against unacceptable risk

• Within IEC translated into a minimum requirement of

being single-fault proof or having at least two lines of defense

• This requirement applies for electrical sources of IEC Energy class 3

• Energy classes 1,2 & 3 are not the same as isolation appliance classes I, II & III

3

IEC60598 luminaire standard; electrical safety IEC Energy classes

Defines which safeguards are required to achieve a safe luminaire

4

Any circuit can be declared Class 3

without measurement!

Safeguard requirements for ordinary persons

5

(ordinary person: a non-instructed or unskilled person)

A safeguard can be…

• physical distance (creepage, clearance)

• insulation material (isolation, shielding)

• protective earth (grounding)

Most LED luminaires are Energy Class 3; either because the luminaire is

connected to mains voltage and/or the driver generates more than 120VDC/50VRMS.

IEC61140 protection against electric shock Protective appliance isolation classes

Describes the different protective appliance isolation classes: Class 0, 01, I, II and III.

Also applies to IEC60598-1. Most LED luminaires are classified as isolation appliance

class I or class II so only these will be discussed.

6

Class I • Luminaire accessible parts connected to

protective earth

• Basic isolation between live and accessible

parts

• Fail-safe : single-fault proof

Class II • Luminaire accessible parts floating

• No protective earth present

• Double or reinforced isolation between live and

accessible parts

• Fail-safe : single-fault proof

LED module

LED module

Control gear (driver)

Safeguards; model of a class II luminaire according IEC Technical Committee

7

Isolation between light

source and accessible part

Accessible

luminaire part

Accessible

luminaire part

Isolation between input

and output circuit

Isolation between light

source and accessible part

Mains voltage

Proposed changes in IEC 60598-1 safety standard

• Standard describes isolation requirements for LED module

– Level (voltage) of isolation (acc. IEC61347-1)

– Creepage and clearance (acc. IEC60598-1)

• Applies both to Indoor and Outdoor luminaires

• LED module isolation depends on isolation level between

driver input – driver output

8

Changes in IEC 60598-1 edition 7 edition 8

• Draft Edition 8 expected to become effective Q1 2014

• Important: Draft Edition 8 is still under discussion and not frozen; so the

current draft may be subject to change

• Grace period: Edition 7 still valid for 3 years after release of Edition 8

– allows release of ENEC luminaire marking acc. Ed. 7

– allows selling Edition 7 compliant luminaires

• During grace period one can choose between Edition 7 or 8 for ENEC

• VDE –on its own initiative- is more stringent on use of VDE mark

– compliance with draft Edition 8 already required now

9

Changes IEC 60598-1

requirements; FDIS* for 8th edition

• LED module isolation is specified as function of…

– control gear input-output isolation

– luminaire isolation classification

10 *FDIS = Final Draft of an International Standard; approval process within IEC

• Based on table on the right, the required LED module

creepage distances & clearances apply

– as described in IEC60598-1:2008

• This will be further clarified in two practical examples

control gear Isolation classification

Example A (1/2) Isolation Class II luminaire, non-isolated control gear

11

LV supply = nominal RMS mains input voltage

Equipotential bonding = all accessible conductive parts electrically connected (eg. housing, reflector, etc)

1. LV supply = 250Vrms , Uout = max output voltage driver (at open-load conditions)

2. Double or reinforced isolation acc. IEC61347-1:2007 4 * Uwork + 2750V

3. Uwork = LVsupply Isolation test voltage: 4 * 250V+ 2750V = 3750V

12

• Minimum required creepage distances: 5mm

Example A (2/2) Isolation Class II luminaire, non-isolated control gear

• Minimum required clearances: 3mm

Example B (1/2) Isolation Class II luminaire, basic isolated control gear

13

ELV = Extra Low Voltage; < 120VDC / 50VRMS

Equipotential bonding = all accessible conductive parts electrically connected (eg. housing, reflector, etc)

1. LV supply = 250Vrms , Uout = max output voltage driver (at open-load conditions)

Uout exceeds ELV 300VDC max for this example

2. Supplementary isolation acc. IEC61347-1:2007 2 * Uwork + 1750V

3. According COMEX*: Uwork = Uout + LVsupply √(LVsupply_rms2 + Uout_rms

2)

Uwork = √(250V2 + 300V2) = 390V

4. Isolation test voltage: 2 * 390V+ 1750V = 2530V *COMEX: Control Gear Member Experts, an IEC sub committee for Control Gear

14

• Working voltage based on √(LVsupply_rms2 + Uout_rms

2) = 390V

Example B (2/2) Isolation Class II luminaire, basic isolated control gear

• Minimum required creepage distances: 3.9mm (interpolated)

• Minimum required clearances: 2.4mm (interpolated)

PTI = proof tracking index – linked to electrical breakdown properties of insulating material

Current Philips LED Systems portfolio

• Current Philips Xitanium driver and LED module combinations all comply with Edition 7.

• Some examples of released system combinations already now comply with draft Edition 8:

15

LED modules LED drivers

Fortimo LED Lines HV Xitanium non-isolated drivers

Xitanium isolated LV drivers

Fortimo LED Lines LV Xitanium isolated LV drivers

Fortimo LED SLM Xitanium isolated LV drivers

Fortimo LED DLM Xitanium isolated LV drivers

Fortimo HBMt Xitanium 40W 0.7A Prog+ GL-J driver

Fortimo LLM Xitanium 40W 0.7A Prog+ GL-J driver

FastFlex Gen II Xitanium Outdoor drivers

For more detailed info or other driver module combinations please contact your local Philips representative

Conclusions

• Philips’ current Xitanium driver and LED module combinations all comply

with IEC60598 Edition 7

• Compliance with Edition 7 allows the selling and application of these

combinations according ENEC till Q1/2017

• Luminaire certification for the specific VDE mark requires compliance with

Edition 8

• Releasing luminaires according Edition 8 is possible by:

– using Edition 8 compliant LED modules

– or using Edition 7 compliant LED modules +

adding supplementary safeguards (isolation, grounding, shielding, spacing)

16

Further discussion and technical support

• For more electrical design-in support needed on this topic, contact

– Your local Philips representative or

– Application Support & Design-In engineer Sjef Jansen at

[email protected]

• More detailed relevant information about LED luminaire, LED module and

control gear requirements can be found in the following IEC standards:

– IEC60598-1: Luminaires part 1: general requirements and tests

– IEC61347-1: Lamp control gear; general and safety requirements

– IEC62031: LED modules for general lighting - safety specifications

– IEC60664-3: Insulation coordination for equipment within low-voltage

systems

17

18

19

Thank you for your attention