Designed for the transmission of sound through noisy areas the balanced quad cable is used as a twisted pair with capacitance unbalance characteristics designed to cancel out the worst kind of interference – external noise. To achieve this four insulated conductors are twisted together with a very short lay length, the insulation thickness on each conductor being closely controlled to match capacitance as closely as possible. Screen is helically wound overall. The product is a flexible high quality cable for use in electrically hostile environments. Core and screen construction conforms to the relevant part of BBC PSF4/1M specification in all cables, as detailed in the Technical Specification below.
SQ
This cable is offered with a variety of jacket colours and diameters. The jacket material is a semi-matt extra-flexible soft PVC, and overall diameter is 4.7mm or 6.5mm. Apart from the jacket material, SQ4.7 conforms to BBC PS4/1M specification.
This has a standard grade PVC jacket and conforms exactly to BBC PSF4/1M specification.
Technical Specification:
| BBC Specification: |
SQB conforms to PSF4/1M |
| |
SQ cores and screen conform to PSF4/1M |
| Conductors: |
14/0.122mm (0.158mm²) tinned copper wire |
| Insulation: |
PVC, O.D. 1.10mm, red, green, blue, white |
| Lay up: |
Four wires twisted together with lay length 13.0mm |
| Screen: |
48/0.15mm tinned copper wire, helically wound |
| Overall jacket: |
SQ4.7: 4.7mm OD soft PVC, semi-matt grey |
| |
SQ6.5: 6.5mm OD soft PVC, semi-matt; black, grey |
| |
SQB: 4.7mm OD PVC, black |
| Capacitance unbalance: |
80pF/m |
| Weight: |
4.7mm OD – 2.8kg/100m |
| |
6.5mm OD – 5.6kg/100m |
| Reel lengths: |
1000m |
| Cut lengths: |
Available in any multiple of 1 metre |
| USAGE NOTE: |
Red + Blue for A leg |
| |
Green + White for B leg |