|IEC 60309 industrial
|In the 1960s the IECEE (International
Commission on the Rules for the Approval of Electrical Equipment)
defined the CEE 17 standard for plugs and sockets for industrial
purpose. CEE is an abbreviation of Certification of
CEE17 has been superseded by IEC 309 in 1983, and later renamed IEC 60309 standard (IEC = International Electrotechnical Commission).
In the UK the IEC 309 standard was adaopted as BS 4343 in 1968, and replaced by BS EN 60309 in 1999.
|There are many types of IEC 60309
sockets, ouitlets, plugs, connectors and application inlets. They
differ with respect to:
voltage: <50 to 690 Volt AC and 50 to 250 Volt DC;
current: 16 to 125 Amp;
frequency: 50 or 60 Hz (for aircrafts >60 Hz).
Connections are either splash-proof (IP44), or waterproof (IP67).
All plugs and sockets have a protective earth (E) connection.
Three-phase devices exist with and without neutral connection.
|Basic features of IEC 60309 plugs and
|Plugs have round pins, arranged in a
circle. The diameter of the earth pin (E) is always 2 mm larger than
the other pins.
Male plugs and appliance inlets have a circular shroud. Sockets and connector plugs have matching recess.
Plugs and male inlets have a key (see image top left). Sockets and connectors have a matching, invariably down facing keyway.
The position of the (large) earth pin can be in one of 12 positions, described as clock positions (1 -12 hour), see image below.
The earth pin 6h clock position corresponds to the fixed position of the socket keyway.
ELV plugs and sockets have a different key system.
|For each type of plug only one matching
This ensures that connection is only possible when voltage, current, frequency and number of pins/contacts match.
Various configurations arise from differences in:
1. number of pins: 3, 4 or 5 (special variants with <5 pins exist),
2. earth pin clock position and
3. diameter of pin shroud / socket recess.
The scheme below shows that pin number and earth pin clock position results in 36 different configurations. Differences in diameter adds many more.
|Colour codes 2
|100 - 130 Volt AC 3
||120/240 V split phase 60Hz (N.Am. only)|
|200 - 250 V||50 - >259 V DC|
|380 - 480 V||277 V 60 Hz (N.Am. only)|
|490 - 690 V||100 - 500 Hz (among others used in aircrafts) 4|
|Colour codes for Extra Low Voltage:
violet for 20 - 25 V, white for 40 - 50 V (not in museum
| Footnotes: 1.
rated at >50V; the museum does not have extra-low voltage (ELV) models.
2. colour code of sockets is often restricted to the cover. 3. unless stated otherwise AC refers to either 50 or 60Hz.
4. green is sometimes combined with another colour that indicates the voltage range.
splash-proof socket outlets and connector plugs have a spring loaded
hinged cap. When a plug is inserted, the cap hooks over a lug on the
plug and retains it in place. See image left.
IP 67 waterproof outlets have a gasket and twist-lock ring which seals outlet and plug together.
Farnell Mennekes Scame
|D i g i t a l M u s e u m o f||P l u g s a n d S o c k e t s|