Type 321 / Type 331 BS 6708 1900/3300 V Armoured Trailing Cable

Type 321 / Type 331 for mine roadway extensions and mechanically protected quarry trailing

Type 321 / Type 331 mining cable is specified in the supplied BS 6708 datasheet for mine roadway extensions and mechanically protected quarry trailing. This page keeps the source-listed voltage, test reference, core functions and dimensional tables together so a procurement engineer can compare the requested model against the cable marking and the equipment connection. The editorial focus is the armoured roadway-extension family at 3.3 kV, not a generic promise of performance.

The supplied construction uses three power cores and one earth core laid around an elastomeric centre, with galvanized pliable wire armour and a heavy flame-retardant PCP jacket with blue stripe. That arrangement matters because Type 321 leaves the power cores unscreened; Type 331 adds composite copper/nylon phase screens. Both include an earth core and armouring. The family should therefore be selected by model, core function and installation route as well as by voltage. The mining and tunnelling cable range provides the wider TEBAOFLEX product context.

• Choose by: confirm whether the project needs Type 321 unscreened power cores or Type 331 screened power cores, then check armour and route constraints.
• Confirm before ordering: existing sheath marking, conductor area, cable length, route, support or handling system, terminations and the required inspection documents.
• Do not infer: values not listed in the supplied PDF, such as a different current basis, water/oil/UV performance, certification scope or mechanical interchangeability.

The Mining & Tunnelling solutions page provides project context when armour, phase screening and the higher-voltage trailing route must be reviewed together.

For a technical quotation, send the equipment nameplate or existing cable marking, voltage and size requirement, installation conditions, quantity, destination and any project-specific test or documentation requirement.

Type 321 / Type 331 construction

The cross-section below is the supplied construction drawing for Type 321 / Type 331. The ordering decision is driven by Type 321 leaves the power cores unscreened; Type 331 adds composite copper/nylon phase screens. Both include an earth core and armouring.

Source-listed construction

Do not use the drawing as a substitute for the dimensional tables. Confirm the cable end preparation, screen and earth termination, armour bonding and machine interface with the equipment documentation before installation.

Type 321 / Type 331 applications

The supplied datasheet identifies this cable for mine roadway extensions and mechanically protected quarry trailing. Google result patterns for the BS 6708 family also separate cables by equipment duty, voltage class, core function and whether the route is armoured, screened, flat or auxiliary. That is why this page keeps the Type 321 / Type 331 construction separate from nearby Type numbers.

• Primary duty: mine roadway extensions and mechanically protected quarry trailing.
• Model boundary: Type 321 leaves the power cores unscreened; Type 331 adds composite copper/nylon phase screens. Both include an earth core and armouring.
• Project check: match the cable marking, core map, voltage, termination, route geometry and handling method to the machine drawing.
• Environmental review: confirm the actual mine/quarry conditions and any authority, inspection or documentation requirements; do not infer a certification or material-resistance claim from the model number.

Where the power route moves to 3800/6600 V, review the Type 630/631 armoured mining cable as a separate voltage family rather than inferring compatibility from the trailing-cable format.

The cable should be released only after the equipment route, required length, conductor area, core functions and connection details are agreed. If the intended duty is different from the source-listed application, request an engineering review through the quotation process.

Type 321 / Type 331 specifications

The summary below identifies the supplied model family. The source-transcribed tables that follow retain the PDF's dimensional, electrical and construction values, including available sizes, resistance, current, diameter, mass, bending or pulling data when the PDF provides them.

Complete source-transcribed technical tables

Source PDF: BS6708_TYPE_321_TYPE_331_1900_3300V_ARMOURED_TRAILING_CABLE_datasheet.pdf; 4 pages; 6 extracted tables. Values are not recalculated or replaced by third-party values.

Use the table values with the equipment drawing and approved termination plan. If the requested conductor area, current basis, mechanical limit or environmental condition is not listed in the supplied PDF, treat it as a quotation-stage confirmation item.

Type 321 / Type 331 standards and references

The product page preserves the BS 6708 reference appearing in the supplied PDF. The BSI record currently identifies BS 6708:1998 as withdrawn on 22 May 2026; this status note is a standards-reference update, not a claim that the product is currently certified or approved. See the official BSI BS 6708 scope record for the published status.

For an RFQ, state the required standard documents, inspection scope, test report, cable marking, destination rules and any replacement-equivalence requirement. The model number alone does not establish legal installation compliance.