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Vertical Flame Testing

Vertical Flame Testing for Cables

The Vertical Flame Test to BSEN 60331-1-2 is designed to assess the flame retardant properties on a single cable length. This Vertical Flame Test for fire propagation forms part of The Cable Lab's cable testing capabilities.

Test methodology requires a cable sample of approximately 600mm to be placed vertically between two clamps. A burner flame is then applied for the duration specified in Table 1 below, igniting the cable. After the designated length of time, the flame is removed and the cable should self-extinguish. In order to pass this cable fire performance test, the cable burn should not reach 50mm from either clamp.


Vertical Flame Test BSEN 60331-1-2: Table 1

Overall Diameter of test piece (mm) Time for flame application (s)
D ≤ 25 60 ± 2
25 < D ≤ 50 120 ± 2
50 < D ≤ 75 240 ± 2
D > 75 480 ± 2


This fire performance test is performed on a finished cable or the insulated single conductors, meaning all layers of the cable construction are subjected to the burner flame. 

  Vertical Flame Test diagram

CSA FT1 Vertical Flame Testing

The Canadian Standards Agency (CSA) also has a single wire Vertical Flame Test designated CSA FT1, which is performed on the finished cable or equipment wire. 

The CSA FT1 cable standard and the cables are designed primarily for the North American and export markets.


cable vertical flame test

UL VW-1 Vertical Flame Testing

UL VW-1 is the American standard for cables and wires, also known as UL 1581, and determines flame retardancy. It requires 5 cycles of 15 seconds of a burner application with a break of between 15 seconds and 60 seconds between each cycle depending on the requirements of the individual cable standard.

Passing the VW-1 test requires the wire to self-extinguish within 1 minute and for the paper flag affixed to the top of the sample to not be more than 25% carbonised, and for the droplets released during burning to not ignite the cotton underneath.

Our range of cables to UL VW-1 standard includes our single core PVC insulated UL1007 Hook Up Wires.


For more information on our cable fire performance test capabilities, please contact our technical team who can advise on the most appropriate cable test for your application. The classifications for fire performance testing against British, European and international standards is answered in our FAQs.

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The Cable Lab®

UKAS-accredited specialist cable testing laboratory

About Eland Cables

The Cable Lab® our in-house cable testing facility, is UKAS-accredited to ISO 17025, which is the single most important standard for calibration and testing laboratories around the world. Accreditation to this international standard demonstrates our laboratory's technical competence and the accuracy of its results.

For our customers, it means peace of mind. They can have full confidence in the quality of our products and can demonstrate due diligence in selecting their cable supplier.

Our customers can also rely on the Cable Lab's services for an independent, objective and comprehensive quality assessment of cables procured from third parties.


About Eland Cables

About Eland Cables

Established in 1975, Eland Cables is a supplier of power, data, instrumentation and control cables and cable accessories to the world's most demanding industries and to some of its most prestigious projects. Our reputation is built on an unswerving focus on quality, technical expertise and customer service.


Our focus on quality has resulted in our in-house specialist cable testing facility securing the ISO 17025 accreditation. This certifies the competence, impartiality and performance capability of our laboratory and its evaluations. In turn, it means peace of mind for our customers with regard to the quality of the cables they source from us.

Expert tecHnical support

Our highly-qualified technical team is on hand to provide technical support with all aspects of cable selection, technical specification, regulatory requirements, and bespoke cable design and manufacture.

Complete Cable Solutions

We are a key contributor to projects in over 100 countries every year, adding value through comprehensive technical support, reliable logistics, innovative solutions, and a customer-centric approach.