Polarized connectors are not harmonised yet but seems US is following a
polarized one. Anyone knows if it is due to this reason?
Leakage current is controlled by harmonised safety standard for non-polarized
connectors.
Mains switch on live wire is not mandatory in safety standard. I encountered
one occasion during the return analysis that the heater failed in dielectric
strength test during its product cycle and the customers suffered the
electrical shock hazard after power off the appliance since the heater was
connected to live at one end. Currently the safety standard does not look
after this area.
Scott
From: Pete Perkins <peperkin...@cs.com>
Date: Tuesday, 31 January 2017 at 3:32 AM
To: 'Scott Xe' <scott...@gmail.com>, <EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: RE: [PSES] Double Pole Mains Switches, Cord Connected Products
Scott, Mike et al,
The single pole switch is intended to be in the line side of the
input power; in the case where the polarity is reversed, the emc components can
be powered with line voltage on both Line and Neutral side increasing the
electric shock touch current and protective conductor current.
Safety standards need to specify testing in both Normal and Reverse polarity to
ensure that the touch current and/or protective current is still within the
limits specified under this condition.
Use of a double pole switch ensures that this doubling of the
touch current from the emc filter doesn’t happen.
This same condition occurs with a single fuse in one pole of the
input circuit.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201
p.perk...@ieee.org
From: Scott Xe [mailto:scott...@gmail.com]
Sent: Monday, January 30, 2017 5:51 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Double Pole Mains Switches, Cord Connected Products
Some national plugs may not be reversible but those countries also widely
acceptable to 2-pin Europe plugs or 3-pin Schuko plugs that are reversible.
The safety standards do not need DPDT switch in compliance. Even though the
single pole is not restricted to be on the live wire. Thus the switch on
neutral wire is still considered acceptance.
Needless to say, single pole switch on live wire and DPDT switch are considered
the best practice in safety perspective. As I see less and less this practice
is implemented in the latest products due to no support from harmonised safety
standards.
Regards,
Scott
From: Mike Sherman ----- Original Message ----- <msherma...@comcast.net>
Reply-To: <msherma...@comcast.net>
Date: Sunday, 29 January 2017 at 12:16 AM
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: [PSES] Double Pole Mains Switches, Cord Connected Products
Because of the lack of polarization on many 2 pin European plugs, I have always
recommended double pole mains switches on cord connected products for the EU
market. However, I am not finding support for this in standards such as
60335-1, 60601-1 or 62368-1.
Your thoughts will be appreciated, oh experienced group, on:
--safety issue involved
--standards that do require double pole (sometimes referred to as "all-pole")
mains switches.
Mike Sherman
Graco Inc.
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