GE Mark VIe System Manual page 151

6.7.4 Low-voltage Shielded Power Cables
This section defines the minimum requirements for low-voltage shielded cable. These guidelines should be used along with
the level practices and routing guidelines provided previously.
Note The specifications listed are for sensitive computer-based controls. Cabling for less sensitive controls should be
considered on an individual basis.
6.7.4.1 Single-conductor Shielded Cable, Rated 300 V
• 18 AWG minimum, stranded single-conductor insulated with minimum 85% to 100% coverage shield
• Protective insulating cover for shield
• Wire rating: 300 V minimum
• Maximum capacitance between conductor and shield: 492 pF/m (150 pF/ft)
6.7.4.2 Multi-conductor Shielded Cable, Rated 300 V
• 18 AWG minimum, stranded conductors individually insulated per cable with minimum 85 to 100% coverage shield
• Protective insulating cover for shield
• Wire rating: 300 V minimum
• Mutual capacitance between conductors with shield grounded: 394 pF/m (120 pF/ft) maximum
• Capacitance between one conductor and all other conductors and grounded shield: 213 pF/m (65 pF/ft)
6.7.4.3 Shielded Twisted Pair (STP) Cable, Rated 300 V
• Two 18 AWG minimum, stranded conductors individually insulated with minimum 85 to 100% coverage shield
• Protective insulating cover for shield
• Wire rating: 300 V minimum
• Mutual capacitance between conductors with shield grounded: 394 pF/m (120 pF/ft) maximum
• Capacitance between one conductor and the other conductor and grounded shield: 213 pF/m (65 pF/ft) maximum
6.7.4.4 Instrument Cable, 4 – 20 mA
®
• With Tefzel insulation and jacket: Belden
• With plastic jacket: Belden catalog number 9316 or equivalent
Installation Guidelines
®
catalog number. 85231 or equivalent
Public Information
GEH-6721_Vol_I_BP System Guide 151