2491B/6701B Single Core Cable

APPLICATION AND DESCRIPTION

2491B/6701B is equivalent to harmonized code H05Z-K/H07Z-K, these cables are designed for the internal wiring of switchboards and distributor boards with an alternating nominal voltage up to 1000 Volts or a direct voltage up to 750 volts. Generally install in pipes or ducts and internal wiring of appliances with maximum operating temperature of 90º C, and generally in areas (such as public and government buildings) where smoke and toxic fumes may cause a threat to life and equipment. The cables produce no corrosive gasses when burnt which is particularly important where electronic equipment is installed.

CABLE CONSTRUCTION

Fine bare copper strands

Strands to IEC 60228 Cl-5

Thermosetting core insulation type EI5

LSOH - low smoke, zero halogen

INSULATION COLOUR

Green/Yellow, Black, Blue, Brown, Red, White, Yellow, Grey, Violet,Grey, Orange, Pink

TECHNICAL CHARACTERISTICS

Working voltage : 300/500v (2491B), 450/750v (6701B)

Test voltage : 2000 / 2500 volts

Minimum bending radius: 5 x Ø

Flexing temperature : -15ºC to +90ºC

Static temperature : -40ºC to +90ºC

Insulation resistance: 10 MΩ x km

Flame retardant : IEC 60332.1

Smoke density acc. to EN 50268 / IEC 61034

Corrosiveness of combustion gases acc. to EN 50267-2-2, IEC 60754-2

Flame test : flame-retardant acc. to EN 50265-2-1, IEC 60332.1

CABLE PARAMETER

AWG	No. Of Cores × Nominal Cross Sectional Area	Nominal Thickness Of Insulation	Nominal Overall Diameter	Nominal Copper Weight	Nominal Weight	Minimum Insulation Resistance At 90 °C
AWG	# × mm²	mm	mm	kg/km	kg/km	mΩ·km
		2491B
20(16/32)	1 x 0.5	0.6	2.1-2.6	4.8	9	0.013
18(24/32)	1 x 0.75	0.6	2.2-2.8	7.2	12.4	0.011
17(32/32)	1 x 1	0.6	2.4-2.9	9.6	15	0.010
		6701B
16(30/30)	1 x 1.5	0.7	2.8-3.5	14.4	24	0.010
14(50/30)	1 x 2.5	0.8	3.4-4.3	24	35	0.009
12(56/28)	1 x 4	0.8	3.9-4.9	38	51	0.007
10(84/28)	1 x 6	0.8	4.4-5.5	58	71	0.006
8(80/26)	1 x 10	1.0	5.7-7.1	96	118	0.0056
6(128/26)	1 x 16	1.0	6.7-8.4	154	180	0.0046
4(200/26)	1 x 25	1.2	8.4-10.6	240	278	0.0044
2(280/26)	1 x 35	1.2	9.7-12.1	336	375	0.0038
1(400/26)	1 x 50	1.4	11.5-14.4	480	560	0.0037
2/0(356/24)	1 x 70	1.4	13.2-16.6	672	780	0.0032
3/0(485/24)	1 x 95	1.6	15.1-18.8	912	952	0.0032
4/0(614/24)	1 x 120	1.6	16.7-20.9	1152	1200	0.0029
300 MCM (765/24)	1 x 150	1.8	18.6-23.3	1440	1505	0.0029
350 MCM (944/24)	1 x 185	2.0	20.6-25.8	1776	1845	0.0029
500MCM(1225/24)	1 x 240	2.2	23.5-29.4	2304	2400	0.0028

Introduction

In an era where electrical safety and environmental sustainability are paramount, the choice of wiring solutions can significantly impact the integrity of installations in buildings, industries, and public spaces. Have you ever wondered what sets apart a truly reliable single core cable from the myriad options available? Enter the 2491B/6701B single core cable, a versatile and robust product designed to meet the rigorous demands of modern electrical systems. Equivalent to the harmonised code H05Z-K/H07Z-K, this cable is engineered for internal wiring in switchboards and distributor boards, operating at alternating nominal voltages up to 1000 volts or direct voltages up to 750 volts.

At its core, the 2491B/6701B is tailored for environments where safety is non-negotiable. It excels in installations within pipes, ducts, and appliances, with a maximum operating temperature of 90°C. What truly distinguishes it is its low smoke zero halogen (LSOH) properties, which minimise the release of toxic fumes and corrosive gases during combustion. This is particularly crucial in high-risk areas such as public buildings, government facilities, and spaces housing sensitive electronic equipment, where traditional cables might exacerbate hazards during fires.

Applications Across Sectors: Versatility in Action

The 2491B/6701B's applications extend beyond basic wiring, serving diverse sectors with its halogen-free attributes. In commercial buildings, it's ideal for switchboards, where high voltage handling prevents overloads. For appliances, its 90°C rating supports devices like heaters or motors, ensuring thermal stability.

In public and government buildings—prevalent in South African metropolises like Johannesburg and Cape Town—LSOH properties mitigate risks in crowded spaces, complying with building codes that prioritise occupant safety. Industrial settings, such as mining or manufacturing, benefit from its robustness against mechanical stress and temperature extremes.

From an environmental perspective, its zero-halogen design supports sustainable practices, reducing e-waste toxicity. In data centres, where electronic equipment abounds, it prevents corrosive damage during incidents, preserving server integrity.

Emerging applications include renewable energy setups, like solar inverters, where flexibility aids installation in constrained spaces. Overall, its multi-faceted utility underscores adaptability in evolving electrical demands.

Safety and Environmental Considerations: A Holistic View

Safety is ingrained in the 2491B/6701B's DNA, with LSOH insulation curbing toxic emissions. During fires, traditional halogenated cables release dioxins and furans, carcinogenic compounds; this cable avoids them, enhancing survivability per ISO 19700 tube furnace tests.

Environmentally, it aligns with RoHS directives, minimising hazardous substances. In South Africa, amid climate change concerns, such cables reduce carbon footprints through efficient conductivity.

Economically, while initial costs are higher, total ownership costs dip due to durability. Socially, it promotes inclusive safety in vulnerable communities.

Frequently Asked Questions (FAQs)

What is the difference between 2491B and 6701B?

The 2491B is rated for 300/500 V, suitable for lighter duties, while 6701B handles 450/750 V for higher power needs.

Is the cable suitable for outdoor use?

Primarily for internal wiring, but if protected in ducts, it can withstand -40°C to +90°C static temperatures.

How does LSOH benefit electronic equipment?

It produces no corrosive gases, protecting sensitive components from acid damage during fires.

What cross-sections are available?

From 0.5 mm² (20 AWG) to 240 mm² (500 MCM), catering to various current-carrying capacities.

Does it comply with South African standards?

Yes, it aligns with SANS equivalents to IEC norms for flame retardancy and insulation.

The 2491B/6701B single core cable exemplifies innovation in electrical wiring, balancing performance, safety, and sustainability. Its adoption promises safer, greener installations, addressing modern challenges effectively.