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Lampholders for high-pressure discharge lamps
Metal halide and
high-pressure sodium lamps feature extremely different
bases, which include RX7s, Fc2, G8.5, GX10, G12, PG12, E27 and E40,
depending on whether the lamp is single- or double-ended. All
lampholders are subject to the same typical conditions found with
discharge lamps: high ignition voltages and temperatures. The high
start-up currents deserve particular attention in lampholder design.
This is also reflected by the insulation materials, which are usually
solid ceramics or heat-resistant plastic (e.g. PPS - polyphenylene
sulphide). Depending on the lamp´s requirements (voltage, current,
temperature, etc.), silver, nickel and copper alloys with thick nickel
coatings are used as conductors. The luminaire regulation IEC 60598-1,
in accordance with EN 60598-1, defines the safety requirements with
regard to ignition voltages in connection with creepage and air
clearance distances.
Special care must be taken to ensure that lampholders are approved for
discharge lamps when using high-pressure lamps with E27 and E40 Edison
bases. Lamholders that are suitable for this purpose are marked with a
maximum value of "5 kV" and comply with the creepage and air clearance
distances required by EC 60238 and EN 60238 (VDE 0616 part 1). The
lampholder regulations governing special lampholders, IEC 60838-1 and
EN 60838-1 (VDE 0616 part 5), apply analogously to all other base
systems. The high ignition voltage pulses also place special demands on
the conductors. In practice, silicone-insulated conductors with an
outer diameter of 3.6 mm have proved suitable for discharge lamps.
Silicone-insulated conductors with a glass-silk lining with a diameter
of 7 mm should be used for lamps with an immediate hot restart
function.

koumbi a écrit:un petit extrait de VS, un fabricant réputé de systeme d'eclairage.

Lampholders for high-pressure discharge lamps
Metal halide and
high-pressure sodium lamps feature extremely different
bases, which include RX7s, Fc2, G8.5, GX10, G12, PG12, E27 and E40,
depending on whether the lamp is single- or double-ended. All
lampholders are subject to the same typical conditions found with
discharge lamps: high ignition voltages and temperatures. The high
start-up currents deserve particular attention in lampholder design.
This is also reflected by the insulation materials, which are usually
solid ceramics or heat-resistant plastic (a.g. PPS - polyphenylene
sulphide). Depending on the lamp´s requirements (voltage, current,
temperature, etc.), silver, nickel and copper alloys with thick nickel
coatings are used as conductors. The luminaire regulation IEC 60598-1,
in accordance with EN 60598-1, defines the safety requirements with
regard to ignition voltages in connection with creepage and air
clearance distances.
Special care must be taken to ensure that lampholders are approved for
discharge lamps when using high-pressure lamps with E27 and E40 Edison
bases. Lamholders that are suitable for this purpose are marked with a
maximum value of "5 kV" and comply with the creepage and air clearance
distances required by EC 60238 and EN 60238 (VDE 0616 part 1). The
lampholder regulations governing special lampholders, IEC 60838-1 and
EN 60838-1 (VDE 0616 part 5), apply analogously to all other base
systems. The high ignition voltage pulses also place special demands on
the conductors. In practice, silicone-insulated conductors with an
outer diameter of 3.6 mm have proved suitable for discharge lamps.
Silicone-insulated conductors with a glass-silk lining with a diameter
of 7 mm should be used for lamps with an immediate hot restart
function.

et pour un schema de montage, voir la derniere page de ce lien
[url=http://www.vossloh-schwabe.de/images/onecms/site/pdf/Montageanleitung_HID_GB_2008.pdf