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Fire Performance
Various international standards aim to ensure that the level of circuit integrity is not compromised by other components of the electrical system, including cable glands, terminations, joints, and cable support systems.
The need for fire performance cables to perform in the event of a fire is more prevalent today than ever before, and the dangers of fire threatens the safety of people and the continuous functioning of electrical circuits that are required to maintain circuit integrity.
When installing fire performance cables, the resistance to fire of the cable fixings should be at least equivalent to the survival time for the cable, allowing the cable to continue operating as intended. The fire performance of these cable management systems should take into account, fire survival, fire resistance, flame retardancy, flame propagation, smoke toxicity and emissions.
CMP Products manufactures cable cleats specifically for these applications:
- To safely support and restrain cables for means of escape, whilst maintaining circuit integrity
- To safely support and restrain cable for means of fire-fighting, whilst maintaining circuit integrity
- All composite materials of cable cleats (where applicable) are produced in Low, Smoke, and Fume (LSF) as standard
- All composite materials of cable cleats (where applicable) are produced in V0 in accordance with UL94 as standard
- LUL approved and certified polymers are available on request for some of the most stringent smoke toxicity and smoke emission testing
CMP Products’ range of fire performance cable cleats has been rigorously tested to temperatures of 1,200OC including periodic water spray and shock testing. The range is certified to EN50200, BS5839, BS8519, BS8491, BS8434 and AS-NZS 3013, providing fire survival times of up to 120 minutes.
Classifications
Flammability Classes (UL94)
The classification of the ignition and burning resistance characteristics of materials other than metal or ceramic:
| Classification | V-0 | V-1 | V-2 |
| Number of flame applications per sample | 2 x 10 | 2 x 10 | 2 x 10 |
| Maximum burning time of one sample (seconds) | ≤ 10 | ≤ 30 | ≤ 30 |
| Maximum burning time of five samples (seconds) | ≤ 50 | ≤ 250 | ≤ 250 |
| Allowable dripping and subsequent ignition of cotton below | No | No | Yes |
| Allowable afterglow remaining for: (seconds) | ≤ 30 | ≤ 60 | ≤ 60 |
HB – Slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm.
Impact Classification (IEC 61914)
| CLASSIFICATION | IMPACT ENERGY (J) | EQUIVALENT MASS (KG) | HEIGHT MM (± 1%) |
| Very light | 0.5 | 0.25 | 200 |
| Light | 1.0 | 0.25 | 400 |
| Medium | 2.0 | 0.5 | 400 |
| Heavy | 5.0 | 1.7 | 300 |
| Very heavy | 20.0 | 5.0 | 400 |
Corrosion Resistance (IEC 61914)
| CLASSIFICATION | TYPICAL USAGE | MEAN ZINC LAYER THICKNESS (M) | MINIMUM ZINC LAYER THICKNESS (M) | SALT SPRAY DURATION (H) |
| Low | Indoor, dry locations | 5 | 3.5 | 24 |
| High | Outdoor, wet locations | 25 | 18 | 192 |
Resistance to corrosion (IEC 61914 – Clause 11.2)
‘Stainless Steel containing at least 16% chromium need not be tested and are assumed to meet the classification for high resistance to corrosion.’