ek1 vdr 1022 (eng)

1
Action immediately required EK1 decision 482-10 --VDRs between live parts (L/N) and earthed parts (PE) Subject: VDR between live parts (L/N) and earthed parts (PE) Reference: Standard, section EN 60335-1 and OSM/HA 396 Question: Is it allowed for appliances within the scope of the EN 60335 series that basic insulation between live parts (L/N) and earthed parts (PE) is bridged by a VDR? According to OSM/HA Dec. 396, this could be possible under certain conditions and in combination with a protective element for the case of a short circuit of the varistor. Proposal of solution: No, VDRs between L/N and PE are not allowed Reason: The inner resistance of a VDR can decrease during the lifetime of an appliance. This change among other things depends on the selection of the VDR and the number and voltage of the pulses which occur at the VDR. Therefore the limitation of the leakage current of the appliance is not guaranteed. Furthermore the high-voltage test cannot be passed with the common used VDRs. VDRs are not regarded as a radio interference filter and may not be disconnected for the tests of clause 13. Decision Proposal of solution is accepted 2010-10-18 For implement the category B according to AD 06 is essential. DISCLAIMER: All reasonable measures have been taken to ensure the quality, reliability, and accuracy of the information in this newsletter. However, TÜ V SÜ D is not responsible for the third party content contained in this newsletter. TÜ V SÜ D makes no warranties or representations, expressed or implied, as to the accuracy or completeness of information contained in this newsletter. This newsletter is intended to provide general information on a particular subject or subjects and is not an exhaustive treatment of such subject (s). Accordingly, the information in this newsletter is not intended to constitute consulting or professional advice or services. If you are seeking advice on any matters relating to information in this newsletter, you should where appropriate contact us directly with your specific query or seek advice from qualified professional people. The information contained in this newsletter may not be copied, quoted or referred to in any other publication or materials without the prior written consent of TÜ V SÜ D. All rights reserved © 2010 TÜ V SÜ D Asia Pacific Pte Ltd. TÜ V SÜ D |Oct. 2010 24/2010 Standards Info Bulletin Regulatory and technical standards updates relevant to your operations Contact us at: [email protected] Shanghai Tel.: +86 21 6141 0123 Shenzhen Tel.: +86 755 8828 6998 Xiamen Tel.: +86 592 3116 068 Beijing Tel.: +86 10 6590 6186 Ningbo Tel.: +86 574 2786 6658 Chongqing Tel.: +86 23 8980 9513 Wuxi Tel.: +86 510 8820 3737 Tianjin Tel.: +86 22 8319 2258 Hong Kong Tel.: +852 2776 1323 Guangzhou Tel.: +86 20 3832 0668 Qingdao Tel.: +86 532 8503 0106 Taiwan Tel.: +886 2 2898 6818 www.tuv-sud.cn www.tuv-sud.hk www.tuv-sud.tw

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Page 1: EK1 VDR 1022 (ENG)

Action immediately required – EK1 decision 482-10

--VDRs between live parts (L/N) and earthed parts (PE)

Subject: VDR between live parts (L/N) and earthed parts (PE)

Reference: Standard,

section

EN 60335-1 and OSM/HA 396

Question:

Is it allowed for appliances within the scope of the EN 60335 series that basic insulation between live parts

(L/N) and earthed parts (PE) is bridged by a VDR?

According to OSM/HA Dec. 396, this could be possible under certain conditions and in combination with a

protective element for the case of a short circuit of the varistor.

Proposal of solution: No, VDRs between L/N and PE are not allowed

Reason:

The inner resistance of a VDR can decrease during the lifetime of an appliance. This change among other

things depends on the selection of the VDR and the number and voltage of the pulses which occur at the VDR.

Therefore the limitation of the leakage current of the appliance is not guaranteed.

Furthermore the high-voltage test cannot be passed with the common used VDRs. VDRs are not regarded as a

radio interference filter and may not be disconnected for the tests of clause 13.

Decision

Proposal of solution is accepted 2010-10-18

For implement the category B according to AD 06 is essential.

DISCLAIMER: All reasonable measures have been taken to ensure the quality, reliability, and accuracy of the information in this newsletter. However, TÜ V SÜ D is not responsible for the third party content contained in this newsletter. TÜ V SÜ D makes no

warranties or representations, expressed or implied, as to the accuracy or completeness of information contained in this newsletter. This newsletter is intended to provide general information on a particular subject or subjects and is not an exhaustive treatment of

such subject (s). Accordingly, the information in this newsletter is not intended to constitute consulting or professional advice or services. If you are seeking advice on any matters relating to information in this newsletter, you should – where appropriate – contact

us directly with your specific query or seek advice from qualified professional people. The information contained in this newsletter may not be copied, quoted or referred to in any other publication or materials without the prior written consent of TÜ V SÜ D.

All rights reserved © 2010 TÜ V SÜ D Asia Pacific Pte Ltd.

TÜ V SÜ D |Oct. 2010 24/2010

Standards Info Bulletin Regulatory and technical standards updates relevant to your operations

Contact us at: [email protected]

Shanghai Tel.: +86 21 6141 0123 Shenzhen Tel.: +86 755 8828 6998 Xiamen Tel.: +86 592 3116 068

Beijing Tel.: +86 10 6590 6186 Ningbo Tel.: +86 574 2786 6658 Chongqing Tel.: +86 23 8980 9513

Wuxi Tel.: +86 510 8820 3737 Tianjin Tel.: +86 22 8319 2258 Hong Kong Tel.: +852 2776 1323

Guangzhou Tel.: +86 20 3832 0668 Qingdao Tel.: +86 532 8503 0106 Taiwan Tel.: +886 2 2898 6818

www.tuv-sud.cn www.tuv-sud.hk www.tuv-sud.tw