6242B

6242B is a BS 6004 / BS 6500 / BS 7211 type numbers (UK) cable designation: 624 = Flat wiring cable with a bare copper circuit protective conductor (CPC) beside the cores; 2 = Number of cores: 2; B = Low smoke, halogen-free (LSZH / LSF) materials; 6242B = 6242B: flat twin and earth, low smoke version: XLPE insulated cores and a bare CPC in an LSF sheath. 300/500 V; Anixter p. 1:44 gives 70 C maximum conductor temperature (superlecdirect lists -25 to +90 C). BS 7211 (Anixter p. 1:44).

1 coding system recognises this code

BS 6004 / BS 6500 / BS 7211 type numbers (UK)

Symbol	Meaning
`624`	Flat wiring cable with a bare copper circuit protective conductor (CPC) beside the cores
`2`	Number of cores: 2
`B`	Low smoke, halogen-free (LSZH / LSF) materials
`6242B`	6242B: flat twin and earth, low smoke version: XLPE insulated cores and a bare CPC in an LSF sheath. 300/500 V; Anixter p. 1:44 gives 70 C maximum conductor temperature (superlecdirect lists -25 to +90 C). BS 7211 (Anixter p. 1:44)

Fire behaviour (EU CPR)

Halogen-free compound (B). Under the CPR this shows in the additional classes: acidity a1 to a3 (EN 60754-2) and smoke s1 to s3 (EN 50399; s1a and s1b add the 3 m cube test EN 61034-2). The main class, Aca to Fca, depends on the whole construction.
Typically targeted, as declared by makers for this kind of construction in the examples this site checked (not the class of this cable):
- B2ca-s1,d0,a1 1-CXKH-R-J, Kablo Vrchlabí
- Cca-s1b,d1,a1 FG16(O)M16, Nexans (La Triveneta Cavi)
- B2ca-s1a,d1,a1 FG18(O)M16, Nexans (La Triveneta Cavi)
- Dca FXQJ, Nexans Norway
- Cca-s1,d1,a1 H07Z1-K, Nexans Spain
- B2ca AXQJ-RMF, Prysmian Sweden (12/20 kV)
- Cca-s1b,d1,a1 RZ1FZ1-K (AS), Top Cable
- Cca-s1a,d1,a1 RZ1-K (AS), Top Cable (B2ca-s1a,d1,a1 for some sizes)
Listed as sources, alphabetically by maker. No maker pays to appear here.
Low-smoke compound (6242B). Smoke is graded s1 to s3 on the EN 50399 ladder; s1a and s1b add the 3 m cube test EN 61034-2.

A CPR class is declared by the maker in its Declaration of Performance and printed on the sheath (EN 50575 cl 7). This decoder does not assign one. What the CPR classes mean →

Sources: EN 13501-6 draft and FprEN 50575:2014 final draft (drafts, not the published texts); IEC 60332-3-24:2000+A1:2008; EN 13501-3 draft A2.

6242B as the cable designer builds it, 2x2.5+1.5 300/500 V

Flat, 9.8 × 5.2 mm (width × thickness), about 110 kg/km. Nominal values from the standard's tables for this size, computed, not a maker's data.

Layer	Material	Thickness, mm	Over the layer, mm
Insulation	XLPE	0.70	3.2
Filler	Halogen-free (LSZH)		3.2
Sheath	Halogen-free (LSZH)	1.0	5.2

6242B on a drum

The smallest drum that passes every check, for 9.8 mm and about 110 kg/km as the cable designer builds it. Drums as their makers print them; lengths are estimates within a few per cent of the cable makers' own tables: whole layers, wound diameter 1.05 × OD, 50 mm freeboard under the flange rim.

Length	Drum size (its makers)	Layers	Gross weight
500 m	KTG 6 (600 mm flange), plywood KTG drums (Europe), Bayka	12 of 12	62 kg
1,000 m	KTG 9 (900 mm flange), wood KTG drums (Europe), Bayka, KTG	11 of 17	157–161 kg

Barrel at least 15 × OD = 146 mm for a cable of this kind (Low voltage, multi-core): KTG table, the cable's datasheet wins. A load rating is the drum maker's own.

Other lengths, drums and weights: the cable drum calculator

Load it on a truck: 1000 m on its drum in the loading planner

Laying, sizes and datasheet: 6242B

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