Brochure

167
© 2011 – SOURIAU
Underwriter Laboratories
UL1977
Spacing:
For a 250V max connector, distance through air or over material shall be 1.2mm whereas from 250V to 600V connector the spacing is 3.2
minimum. These distances have to be taken between uninsulated live parts as shown in the matrix below:
An alternative way to determine voltage rating is with the Dielectric-Withstand test. If during one minute there is no arc-over or breakdown
the rated voltage is given as given below:
a) 500 volts for a type 1B device
b) 1000 volts plus twice rated voltage for types 1A, 2, 3 and 4 devices.
• Applicability of spacing requirements
Type
Uninsulated live part - uninsulated
live part of opposite polarity
Uninsulated live part - uninsulated
grounded metal part
Uninsulated live part - exposed
dead metal part
0 No No No
1A Yes Yes Yes
1B Yes Yes No
2 Yes Yes Yes
3 Yes Yes Yes
4 Yes Yes Yes
Marking:
A device shall be legibly marked with the manufacturer's trade name, trade mark, or other descriptive marking by which the organisation
responsible for the product may be identifi ed. (Exception: If the device is too small, or where the legibility would be diffi cult to attain, the
manufacturer’s name, trademark, or other descriptive marking may appear on the smallest unit container or carton)
The following shall be marked on the device or on the smallest unit container or carton or on a stuffer sheet in the smallest unit container or
carton:
a) The catalogue number or an equivalent designation
b) The electrical rating in both volts and amperes, if assigned
c) Whether ac or dc, if restricted
d) Flammability class, if identifi ed
Example - Marking for the arrangement 10-3:
10A 500V UL94 V-0
UTS Series
Technical information
Technical information