AS NZS IEC 60331.3:2017 pdf free
AS NZS IEC 60331.3:2017 pdf free.Tests for electric cables under fire conditions – Circuit integrity
The source of heat shall be a ribbon type propane gas burner with a nominal burner face length of 500 mm with a Venturi mixer. A centre-feed burner is recommended. The nominal burner face width shall be 10 mm. The face of the burner shall have three staggered rows of drilled holes, nominally 1,32 mm in diameter and drilled at centres 3,2 mm from one another, as shown in Figure 6. Additionally, a row of small holes milled on each side of the burner plate, to serve as pilot holes for keeping the flame burning, is permitted.
During the test, a current for continuity checking shall be passed through all conductors of the test specimen(s). This shall be provided by a three-phase star connected or single-phase transformer(s) of sufficient capacity to maintain the test voltage up to the maximum leakage current allowable.
NOTE 1 Due note should be taken of the fuse characteristics when determining the power rating of the transformer.
This current shall be achieved by connecting, at the other end of the sample, a suitable load and an indicating device (e.g. lamp) to each conductor, or group of conductors.
NOTE 2 A current of 0,25 A at the test voltage, through each conductor or group of conductors, has been found to be suitable.
A cable sample at least 15,3 m long for single core or 5,1 m long for multi-core shall be available from the cable length for test. The test specimen to be tested shall consist of either a single piece of multi-core cable or three pieces of single core cable not less than 1 700 mm long with approximately 100 mm of sheath or outer covering removed at each end.
At each end of the test specimen each conductor shall be suitably prepared for electrical connections, and after drawing into the appropriate metal enclosure, the exposed conductors shall be spread apart to avoid contact with each other.AS NZS IEC 60331.3 pdf free download.
