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BS 7629-1 Screened Fire Alarm Cables300/500 VBS 7629-1 / BS 5839-1Standard 30 & Enhanced 120

BS 7629-1 Screened Fire-Resistant Alarm Cable300/500 V screened fire-resistant LSZH alarm & emergency lighting cable (Standard 30 / Enh

BS 7629-1 is the benchmark UK 300/500 V screened fire-resistant cable for BS 5839-1 fire detection, voice evacuation and BS 5266-1 emergency lighting systems. Constructed with Damage-Resistant Insudite/silicone-mica insulation, laminated aluminium/copolymer sc

PH30 / PH120

Al-PET + Full CPC

BS 7629-1 / BS 5839-1

Cores × mm²

Order designation: BS 7629-1 Std 2×2.5+E
Outer Ø ≈: 9.4 mm
Copper weight: 72 kg/km
Total weight ≈: 138 kg/km
Min. bend R: 56 mm

All sizes (13)

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Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 300/500 V
Fire categories: Std 30 / Enh 120
Screen & CPC: Al-PET + Cu CPC
Insulation: EI5 / Mica + EI5
Operating temp: -20 to +70 °C
Min. bend radius: 6 × cable OD

Typical values for this cable type, based on BS 7629-1 / BS 5839-1 — confirmed in the datasheet and quotation for your order.

Application fit

Is BS 7629-1 right for your machine?

Specified across commercial buildings, hospitals, schools, airports and rail stations for addressable fire alarm loops, sounder/beacon circuits, voice alarm PA/VA lines and central-battery emergency lighting.

Fixed installation

Suitable

Direct clipping with metal P-clips, tray routing or trunking per BS 5839-1 Clause 26.

Switchgear & control cabinet wiring

Suitable

Terminates cleanly into addressable FACP loop cards, Apollo/Hochiki detector bases and nylon/brass glands.

TBM gantry & advancing tunnel reel

Suitable

LTS3 zero-halogen low-smoke sheath satisfies underground station and escape corridor rules.

Motorised monospiral reel

Not suitable

Solid Class 1 / stranded Class 2 conductors and bonded foil screen are for fixed installation only.

S07HXCHX-F screened flex

Typical machinesFire detection & alarm (BS 5839)Emergency escape lighting (BS 5266)Voice evacuation (PA/VA)Hospitals & multi-phase evacuationSchools, hotels & offices

Construction

Layer by layer

Plain annealed copper conductor (Class 1/2) + fire-resistant EI5/mica composite insulation + full-size uninsulated tinned copper CPC + bonded Al/copolymer screen + red or white LTS3 LSZH sheath.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Plain annealed copper	Solid Class 1 (1.0–2.5 mm²) or stranded Class 2 (4.0 mm²) copper per BS EN 60228BS EN 60228
2	Mica-glass fire barrier (Enhanced)	Glass-mica tape applied under insulation on Enhanced 120 grade for 930 °C impact + water survivalBS 8434-2
3	Fire-resistant thermoset insulation	Cross-linked mineral-ceramic silicone / damage-resistant EI5 compound per BS 7655-1.5BS 7655-1.5
4	Full-size circuit protective conductor	Uninsulated tinned annealed copper earth conductor matching phase cross-section, laid in direct contact with screenBS 7629-1
5	Bonded aluminium/copolymer tape	Longitudinal aluminium/PET tape bonded to outer sheath for automatic stripping and 100 % electrostatic screeningBS 7629-1
6	LTS3 LSZH outer sheath	Thermoplastic low-smoke zero-halogen compound type LTS3 per BS 7655-6.1 (Red for fire alarm, White for emergency lighting)BS 7655-6.1

BS 7629-1 Standard 30 (PH30)

Meets BS 5839-1 Standard grade: BS EN 50200 PH30 & PH60 (842 °C with shock), BS 8434-1 (30 min fire + impact + water) and BS 6387 CWZ.

BS 7629-1 Enhanced 120 (PH120)

Meets BS 5839-1 Enhanced grade: BS EN 50200 PH120 (120 min) and BS 8434-2 (120 min at 930 °C flame + impact + water spray) for multi-story phased evacuation.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on BS 7629-1 / BS 5839-1. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U: 300/500 V
Routine AC test voltage: 2.0 kV rms for 5 minutes
Mutual capacitance @ 1 kHz: ≈95 pF/m (1.5 mm² 2-core)

Thermal

Operating temperature range: -20 °C to +70 °C
Max. short-circuit temperature: +250 °C
Recommended installation temp.: 0 °C to +60 °C

Mechanical

Minimum internal bend radius: 6 × overall cable diameter
CPC conductor size: Equal to phase cross-section (1.0–4.0 mm²)

Resistance

Standard 30 fire test: BS EN 50200 PH30/PH60 + BS 8434-1 (30 min flame/impact/water) + BS 6387 CWZ
Enhanced 120 fire test: BS EN 50200 PH120 + BS 8434-2 (930 °C, 60 min flame+shock + 60 min flame+shock+water)
Halogen acid gas & smoke: BS EN 60754-1 (<0.5 % HCl) & BS EN 61034-2 (>60 % light transmittance)

Reference standards

Cable manufacture: BS 7629-1
System design codes: BS 5839-1, BS 5839-8, BS 5839-9 & BS 5266-1

Identification

Core colours: 2-core: Brown, Blue · 3-core: Brown, Black, Grey · 4-core: Blue, Brown, Black, Grey
Sheath colours: Red (fire alarm) or White (emergency lighting)

Sizes

13 standard configurations (BS 7629-1)

Nominal dimensions, masses and electrical ratings for BS 7629-1 according to BS 7629-1 / BS 5839-1.

Dimensions & masses
Designation	Cores × mm²	Cross-section	Outer Ø ≈ mm	Copper kg/km	Total weight ≈ kg/km	Min. bend R fixed mm
BS 7629-1 standard series
BS 7629-1 Std 2×1.0+E	2×1.0 + 1.0 CPC	1.0 mm²	7.4	29	78	44
BS 7629-1 Std 2×1.5+E	2×1.5 + 1.5 CPC	1.5 mm²	8.0	43	95	48
BS 7629-1 Std 2×2.5+E	2×2.5 + 2.5 CPC	2.5 mm²	9.4	72	138	56
BS 7629-1 Std 2×4.0+E	2×4.0 + 4.0 CPC	4.0 mm²	11.2	115	198	67
BS 7629-1 Std 3×1.5+E	3×1.5 + 1.5 CPC	1.5 mm²	8.6	58	116	52
BS 7629-1 Std 3×2.5+E	3×2.5 + 2.5 CPC	2.5 mm²	10.1	96	168	61
BS 7629-1 Std 4×1.5+E	4×1.5 + 1.5 CPC	1.5 mm²	9.5	72	140	57
BS 7629-1 Std 4×2.5+E	4×2.5 + 2.5 CPC	2.5 mm²	11.2	120	205	67
BS 7629-1 Std 7×1.5+E	7×1.5 + 1.5 CPC	1.5 mm²	11.6	115	215	70
BS 7629-1 Enh 2×1.5+E	2×1.5 + 1.5 CPC (Enh)	1.5 mm²	8.5	43	108	51
BS 7629-1 Enh 2×2.5+E	2×2.5 + 2.5 CPC (Enh)	2.5 mm²	9.9	72	152	59
BS 7629-1 Enh 4×1.5+E	4×1.5 + 1.5 CPC (Enh)	1.5 mm²	10.1	72	158	61
BS 7629-1 Enh 4×2.5+E	4×2.5 + 2.5 CPC (Enh)	2.5 mm²	11.8	120	224	71

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Nominal outer diameters and weights are subject to manufacturing tolerances per BS 7629-1 / BS 5839-1.

Electrical data
Cores × mm²	Max. DC R @ 20 °C Ω/km	Current in air A	Current in duct/tray A
2×1.0 + 1.0 CPC	18.100	15	13
2×1.5 + 1.5 CPC	12.100	19	16
2×2.5 + 2.5 CPC	7.410	26	22
2×4.0 + 4.0 CPC	4.610	34	29
3×1.5 + 1.5 CPC	12.100	17	15
3×2.5 + 2.5 CPC	7.410	23	20
4×1.5 + 1.5 CPC	12.100	17	15
4×2.5 + 2.5 CPC	7.410	23	20
7×1.5 + 1.5 CPC	12.100	13	11
2×1.5 + 1.5 CPC (Enh)	12.100	19	16
2×2.5 + 2.5 CPC (Enh)	7.410	26	22
4×1.5 + 1.5 CPC (Enh)	12.100	17	15
4×2.5 + 2.5 CPC (Enh)	7.410	23	20

Current ratings apply at +30 °C ambient in free air and +25 °C in enclosed tray/conduit.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
2.0 kV AC dielectric & spark test	No breakdown at 2.0 kV rms for 5 minutes	100 % of reels/drums
Sample tests
BS EN 50200 PH30 / PH60 / PH120 fire with shock	Circuit survival under 842 °C flame and 5-minute hammer blows	LPCB / BASEC qualification
BS 8434-1 (30 min) & BS 8434-2 (120 min) fire + impact + water	Survival at 842 °C / 930 °C with direct impact and water spray	Standard & Enhanced qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

BS 7629-1BS 5839-1 Standard & EnhancedBS EN 50200 PH30 / PH60 / PH120BS 8434-1 & BS 8434-2BS 6387 CWZ

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX BS 7629-1 ENHANCED 120 2x1.5mm2+E 300/500V BS EN 50200 PH120 BS 8434-2 LSZH [year]

Delivery form: Fumigated export wooden drums or shrink-wrapped coils
Standard drum lengths: 500 m · 1000 m standard drums (cut lengths on request)
MOQ: 100 m (stock sizes) · 300–500 m (production)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFBS 7629-1 Screened Fire-Resistant Alarm Cable – technical datasheet13 sizes · construction, technical data, approvals XLSXBS 7629-1 spec data (Excel)All 13 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-20
Updated: 2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

When does BS 5839-1 require Enhanced 120 rather than Standard 30 BS 7629-1 cable?

Standard 30 (30-minute survival per BS 8434-1) is used in buildings with single-stage immediate evacuation. Enhanced 120 (120-minute survival at 930 °C per BS 8434-2) is required in hospitals, large multi-storey towers and complex venues using phased evacuation where circuits must remain active in unsprinklered fire zones.

How does the bonded aluminium screen speed up termination on BS 7629-1?

The longitudinal aluminium/copolymer tape is fusion-bonded to the inside wall of the LTS3 LSZH outer sheath. When the installer rings and pulls off the outer sheath, the foil screen strips off automatically in one movement while leaving the full-size tinned copper CPC ready to sleeve.

Why must BS 7629-1 cables be fixed with metallic clips rather than plastic clips?

Under BS 5839-1 and BS 7671 Regulation 521.10.202, plastic clips and plastic trunking soften and fail at around 120–150 °C, causing premature collapse of wiring in escape routes. Fire-rated copper or stainless-steel P-clips and metal supports are mandatory.

Can BS 7629-1 be twisted or used for addressable fire alarm data loops?

Yes. The 100 % bonded aluminium screen and low mutual capacitance of the laid-up cores provide high immunity to electrostatic and electromagnetic interference, making BS 7629-1 the standard choice for addressable detection loops and voice alarm circuits.

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BS 7629-1 Screened Fire-Resistant Alarm Cable

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Datasheet Request a quote

BS 7629-1 Screened Fire-Resistant Alarm Cable300/500 V screened fire-resistant LSZH alarm & emergency lighting cable (Standard 30 / Enh

Fixed installation

Switchgear & control cabinet wiring

TBM gantry & advancing tunnel reel

Motorised monospiral reel

BS 7629-1 Standard 30 (PH30)

BS 7629-1 Enhanced 120 (PH120)

Electrical

Thermal

Mechanical

Resistance

Reference standards

Identification

Inspection certificate

Product approvals

Company certificates

01Selected sizes

02Reel & motion

03Message for our engineers

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