3-phase plugs and sockets
has a unique type of 16A three-phase plugs and sockets for domestic
indoor use, known as the Dansk
Flerpolet System (Danish Multipole System). They are already
made for many decades by Lauritz Knudsen. IEC
60309 devices are used for (semi-) industrial and outdoor
socket, rated at 16A - 400
V. The socket dates probably back to the 1990s. Model for surface
mounting, either vertical or horizontal (under a
kitchen or workshop bench). The recessed outlet is covered by a lid
(see also image no. 4).
plug, rated at 16A-440V.
Three-phase plugs are irreversible because of the shape of the
protective earth pin (center pin) and guides/notches at the right hand
side of plugs/outlet (see nos. 2 and 6).
1 with a red/green* version of plug no. 3. Note that the lid has a 'hook' to prevent
an untimely disconnection of the plug when a pulling force is exerted
on the connected cable. Connector no. 7 has a comparable provision; see
image no. 8.
single phase socket with switch rated at 10A - 250V. The outlet
resembles that of three-phase models (nos. 1 and 7). See images 6, 9
and 10 for details. This probably late 1930s model is obsolete now.
of the slots of three-phase socket no. 1,2 (top image) and classic
single phase model no. 5. Sockets show the old abbreviations: zero
(neutral), F (phase = line) and J (jord, Danish for earth). Modern markings are copied from plug no. 3.
connector with lid, rated at 16A-440V. Image no. 8 shows plug no.4 inserted in connector no. 7.
Two-colored red/green plugs and sockets indicate hardened versions for use in rough (workshop etc.) conditions. They are made from a stronger plastic type but are otherwise identical to their regular domestic versions. Red/green plugs fit in standard sockets as image no. 4 shows. Information given by Jacob Bohn, Denmark.
Inside view of the classic 10A single phase socket no. 5.
The enlarged image of the earth contact shows that one of six clips is missing (green arrow), because the earth pin has a guide for the correct orientation of the plug (see plug no. 3).
The socket has a two pole switch. Image no. 10 shows the mechanism that makes/breaks the neutral and line connection.
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