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
®
catalog number. 85231 or equivalent
•
With plastic jacket: Belden catalog number 9316 or equivalent
Installation Guidelines
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