Hi Mike:
The standards require a “disconnect device.” Many manufacturers of
cord-connected products define the plug as the disconnect device, which then
allows a (functional, not a safeguard) single-pole mains switch.
Also, many products do not have a physical mains switch such a
The general safety requirement for equipment is to be able to be `disconnected”
; a term for having no hazardous voltage inside.
A disconnect device is any system within reach of the user that allows to
disconnect the apparatus form all live voltage.
That can be double pole switch, but also a
Hello Mike,
Single-pole switches are acceptable and typical on plug connected single-phase
equipment and sometimes on two-phase equipment. IEC 60950-1 has the somewhat
cryptic marking “Double Pole/Neutral Fusing” as indication to service personnel
that there may still be live voltage in the equ
Those, too. I didn't say that the DP switch is a safety issue, it's a
reliability or durability issue.
When IEC/EN 60065 required DP switches on TVs, I pointed out the implications
of a short-circuit, and proposed that the product's fuse be connected upstream
of the switch. Although I was 'He
FWIW, the same applies to the 10/16A 2-pin plugs, most of which also reversible.
However, there are some national exceptions, notably in Denmark, Switzerland &
Italy which have some unique plug/socket combinations of their own – some of
those are reversible and some are not.
Not sure I ag
ALL European 2-pin 6 A plugs are reversible, and 3-contact plugs used on the
Continent are reversible (there are two kinds, one with 2 power pins and
side-contact for earth (called 'Schuko') and one with a third pin for earth).
The standards you cite are written so that the product is safe, wh
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, o
Dear Members,
Does Malaysia mandate EMC requirements? If yes, is there any official
document available?
A quick Google search found "At present, for electromagnetic compatibility,
there are not mandatory requirements in Malaysia." (
http://www.agc-cert.com/en/cert.php?cid=123&id=102). I don't k
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