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© 2011 – SOURIAU
Underwriter Laboratories
UL1977
There are several standards which deal with plug and receptacle. Each of them is only for a small area of applications. It could be
telecommunication, Etc. The UL 1977 covers single and multipole connectors intended for factory assembly.
Requirements apply to devices in taking into account intensity and voltage. There a categories as follows:
Type 0 Type 1A
Tybe 1B
Type 2
Type 3
Type 4
0
0
8.3 A
31 A
200 A
1000 A
600 V
30 V
(42 V peak)
According to above table, the level of performance that has to be reached could be different. Most of them are explained in the following page.
Assembly:
Connector has to be keyed to prevent any mismating that can damage the machine or hurt the user. In the same way, plugs and sockets have
to be equipped to protect persons against contact with live parts.
Finally the identifi ed grounding contact shall be located so that the corresponding electrical continuity has to be completed before any other
contact.
Insulating materials:
Material uses for electrical insulation, as a minimum, have to comply with the characteristics shown below:
• Minimum ratings for polymeric materials
Type Flame rating
Relative thermal index (RTI)
Electrical/mechanical w/o impact *
/
**
0 - 50/50
1A HB 50/50
1B HB 50/50
2 HB 50/50
3 HB 50/50
4 HB 50/50
* The RTI of the material shall not be lower than the temperature measured during
the Temperature Test.
** For a thickness less than that for which a value has been established, the RTI of
the minimum thickness with an established value shall be used.
UTS Series
Technical information