UL 467

22

UL 1685

APRIL 25, 2007

14 Smoke System Calibration

14.1 Prior to the start of each day of testing, the linearity of the photometer system is to be verified by interrupting the light beam with multiple calibrated neutral-density filters to cover the range of the recording instrument.

15 Test Specimens

15.1 Cable mounting

15.1.1 Two sets of specimens of each cable construction are to be tested. Each set is to consist of multiple 96-inch (244-cm) lengths of the finished cable. Depending upon the outside diameter of the individual cable, the test specimens are to be either separate, individual lengths or a bundle of individual lengths. The specimens or specimen bundles are to be centered between the side rails in a single layer. The lower end of each specimen or specimen bundle is to be located not more than 4 inches (100 mm) above the bottom end of the cable tray. Each specimen or specimen bundle is to be separately attached to each rung of the cable tray using one wrap of copper or steel wire not larger than 14 AWG (2.1 mm2).

15.1.2 CABLES SMALLER THAN 13 mm � For cables smaller in diameter than 13 mm (0.51 inch), the specimens are to be grouped into untwisted bundles (nominally circular) as indicated in Table 15.1. The bundles are to be spaced one-half bundle diameter apart on the cable tray as measured at the point of attachment to the cable tray.

Table 15.1
Tray loading for circular cables smaller than 13 mm (0.5 inch) in diameter

Cable diameter, mm (inch)
Number of cables in each bundle Number of bundles in tray

From

But less than

3 (0.12)

19

13

3 (0.12)

5 (0.20)

19

8

5 (0.20)

6 (0.24)

7

9

6 (0.24)

9 (0.35)

3

10

9 (0.35)

11 (0.43)

3

8

11 (0.43)

13 (0.51)

3

7

15.1.3 CABLES 13 mm and LARGER � For cables 13 mm (0.51 inch) and larger in diameter, each specimen is to be individually attached to the cable tray with a separation of one-half cable diameter or 15 mm (0.59 inch) (whichever is less) between specimens. The tray loading is to comply with Table 15.2.

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