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UL certification

PCB terminal blocks and PCB connectors with UL certification

UL certification  

UL certification

UL approval for international use

As a responsible manufacturer of device connection technology, Phoenix Contact develops and tests products so that you can have your devices approved for use internationally. The Underwriter Laboratories (UL) recognize terminals and connectors as individual components (UL 1059). In the end application, components undergo final evaluation and are approved together with the device.

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UL approval according to product standards

UL 1059: terminal blocks

In order for Phoenix Contact products to be able to be used in industrial applications without restrictions, they are generally tested and recognized in accordance with UL 1059. The following table lists the air clearances and creepage distances required for the components. The Use Group refers to the subsequent area of application of the end device.

Use
Group
Area of application

Maximum
voltage (V)

Required
clearance (mm)
Required
creepage distance (mm)
AOperating elements, consoles, etc.

150

300

600

12.7

19.1

25.4

19.1

31.8

50.8

BStandard devices, including office and electronic data
processing equipment, etc.

150

300

600

1.6

2.4

9.5

1.6

2.4

12.7

CIndustrial applications, without restrictions

150

300

600

3.2

6.4

9.5

6.4

9.5

12.7

D

Industrial applications, operating equipment with limited rating

300

600

1.6

4.8

3.2

9.5

E

Connection technology for the power range 600 - 1500 V

1001-1500

1001-1500

14

17.8

21.6

30.5

F

Industrial applications, equipment that has been assessed in accordance with UL 508, 508 C, 840

Industrial applications, equipment that has been assessed
in accordance with UL 508, 508 C, 840

As defined in the device standard

As defined in the device standard

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UL approvals according to device standards

UL 508 “Industrial control equipment”

Terminal blocks, which are recognized in accordance with UL 1059 Use group C, meet the requirements of UL 508 for field wiring terminal blocks and can thus be used without restriction in devices in accordance with this standard. In certain cases, UL 508 also permits the alternative rating in accordance with UL 840.

UL 508 C "Power conversion equipment"

This UL standard applies specifically to power electronics (including frequency converters). The requirements for field wiring terminal blocks are similar to the specifications of UL 508. Alternative rating in accordance with UL 840 is also possible here in certain cases.

UL 61800-5-1 “Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements [...]”

UL 61800-5-1 is a new standard for power electronics. Here as well, the requirements for field wiring terminal blocks are similar to the specifications of UL 508. An alternative rating in accordance with IEC 60664-1 is possible here in certain cases.

UL 840 "Insulation coordination including clearances and creepage distances for electrical equipment"

This standard describes alternative procedures for designing the insulation of end products for defined ambient conditions (overvoltage category, pollution degree, material index), provided that this is permitted by the device standard.

Special aspects of the product and device standard

Depending on the device standard, PCB terminal blocks and PCB connectors certified in accordance with the product standard
UL 1059 for a maximum voltage of 300 V may also be used in 600 V applications providing certain requirements are met.

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In accordance with UL 840 (3rd edition 2005), the following procedures are carried out to determine air clearances and creepage distances:

  1. Equivalent clearances
    Not meeting the clearance required in the device standard is permitted if the end device passes the impulse voltage test described in UL 840 (Table 7.1*) without sparkover. The amount of impulse voltage depends on the clearance required in the product standard.
  2. Clearances for limited surge voltages
    If it is ensured that surge voltages occurring during operation do not exceed a specified maximum value, the required clearances with known pollution degree can also be determined in accordance with Table 8.1*.
  3. Creepage distances
    The minimum requirements described in Table 9.1* for general creepage distances and those specifically for PCBs must be met, taking into consideration the operating voltage, pollution degree, and resistance to creepage of the material.

* Tables in accordance with UL 840 standard


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Further information
Certification and approval

Phoenix Contact UAB

Svitrigailos str. 11B
03228 Vilnius
+370 5 210 6321

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