Bending Test
- Conduits shall be subjected to a bending test.
- Reference to the values and to the tests for conduits are made in one relevant conduit specifications taking into account the manufacturer's instructions for bending, so far as they do not contravene the aims of this specification as a whole.
Compression Test
- Samples of conduit, each 200 mm long, shall be subjected to a compression test using the apparatus shown in Fig. Before the test, the outside diameter of the samples shall be measured. The samples shall then be conditioned at a temperature of 27± 2°C for at least 10 hours.
- Immediately after the conclusion of conditioning period, the samples shall be positioned on a flat steel support and a steel intermediate block as shown in Fig. is placed on the middle of the sample. Slowly increasing force as shown in Table for different types of conduits shall then be applied to the intermediate piece within 30 seconds.
- Reference to the values and to the tests for conduits are made in one relevant conduit specifications taking into account the manufacturer's instructions for bending, so far as they do not contravene the aims of this specification as a whole.
Force for Compression Test
| Type of Conduit | Compression Force (N) |
|---|---|
| Very light | 125 |
| Light | 320 |
| Medium | 750 |
| Heavy | 1250 |
| Very heavy | 4000 |
Note - The values in the table are subject to modification in relevant conduit specifications.
Collapse Test
- Samples of conduits made of insulating materials of length as specified in Table shall be bent at room temperature, the bending radius being as given relevant conduit specifications. The samples are then fixed to a rigid support by means of four straps.
Length of Samples for Collapse Test
| Size (mm) | 16 | 20 | 25 | 32 | 40 | 50 | 63 |
|---|---|---|---|---|---|---|---|
| Length (mm) | 340 | 370 | 450 | 590 | 740 | 900 | 1130 |
- If mechanical bending aids recommended by the manufacturer are used for rigid conduits, the mechanical aids shall be moved. The support with the sample in position is kept for 24 hours in a heating cabinet at a temperature of 60± 2ºC unless specified otherwise in the relevant conduit specification.
Impact Test
- Twelve samples of conduits, each 200 mm long, shall be subjected to an impact test by means of the apparatus. Before the rest, the samples shall be conditioned at a temperature of 60±2ºC for 10 days (240 hours).
- The test apparatus shall be placed on a pad of sponge rubber 40 mm thick, and this together with the sample, shall be placed in a freezer, the temperature within which is maintained at -5 ±2ºC
- When the samples have attained the temperature of the air within the freezer or after 2 hours , whichever is longer period, each sample shall be in turn placed in position on the steel base shown in Fig. and the hammer is allowed to fall whereby an impact energy £ according to Table is applied. The mass of the hammer and the fall height are also specified in Table.
Forces for Impact Test
| Conduit | Impact Energy - Height (£) | Mass of the - Kg. | Fall - mm |
|---|---|---|---|
| Very light | 0.5 | 0.5 | 100±1 |
| Light | 1.0 | 1.0 | 100±1 |
| Medium | 2.0 | 2.0 | 100±1 |
| Heavy | 6.0 | 2.0 | 300±1 |
| Very heavy | 20.0 | 6.8 | 300±1 |