| Is there a EU-wide convention for the marking of
| terminals in a single-phase appliance?
|
IEC-445 contains information on just this subject.
| It is understood that the PE terminal must be marked or
| identified with the green-yellow color, but is there any
| expectation or requirement that "L" and/or "N" be present?
|
IEC-445 says, "Equipment terminals which are intended to be
connected directly or through intermediate equipment to certain designated
conductors shall be marked with reference letters according to Table 1."
Table 1 recommends U, V, and W for phase 1, 2, and 3. It specifies N for
neutral. These letters are for "Equipment terminal marking" according to
table 1.
What is interesting is that Table 1 specifies L1, L2, L3, N as
designators for "Identification of conductor terminations." I presume this
is the marking on the wires. This leads to wire L1 connected to U, L2
connected to V, etc.
| What if only "L" was present? only "N"? neither? Is
| there any objection to marking both "L" and "N"?
|
| In the risk assessment for a hypothetical device, no
| additional hazards are created during operation if the live and
| neutral lines are switched.
IEC 445 specifies that the marking principles only need to be
followed "Where the identification of equipment terminal and of terminations
of certain designated conductors is considered necessary..." I wonder who
is the one that determines the necessity of identification.
It should be considered that some level B or C standards require
that the marking on the documentation match that on the machine. For
example, this is required by 60204.
Mark Werlwas
Product Safety Engineer
Lam Research
4650 Cushing Parkway
Fremont, California 94538
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