IEC 60227-3 · EN 50525-2-31 · 450/750V · Export Range

H07V-U · H07V-R · H07V-K
Building wire for Europe and Africa.

The H07V family is the international standard for single core PVC insulated building wire at 450/750V. Three conductor variants — solid (U), standard stranded (R), and fine-stranded flexible (K) — cover every fixed installation and panel wiring application. Manufactured at 1100V to IS 694:2010, exceeding the IEC 450/750V requirement.

1100V

IS 694:2010 rating — exceeds 450/750V IEC

70°C

Continuous conductor temperature

MTO

Made-to-Order Project Supply

BIS

IS 694:2010 certified production

IS 694:2010 — BIS certified production (CM/L-8800140116). Export builds are strictly Made-to-Order (MTO), manufactured on the same certified line to a higher dielectric specification than IEC 60227-3.

Lead-free PVC compound

RoHS compliant — no restricted substances

IEC 60332-1-2:2004 flame retardant

BIS IS 694:2010 certified production

Standard Decoding

Understanding the H07V designation.

The IEC 60227 code system encodes every construction parameter into the designation. H07V is the common root — the three variants differ only in conductor class:

Designation	Conductor	IEC 60228 Class	Equivalent IS 694:2010 Product	Primary Application
H07V-U	Solid copper	Class 1	FR Single Core Wire	Fixed building installation — wall conduit, embedding
H07V-R	Standard stranded copper	Class 2	FR Single Core Wire	Fixed installation where some flexibility in installation is needed
H07V-K	Fine-stranded copper	Class 5	Single Core Flexible Wire	Panel internal wiring, switchgear, enclosed duct wiring

H = harmonised European standard · 07 = 450/750V rated voltage · V = PVC insulation · U/R/K = conductor class. IEC 60227-3 governs all three. EN 50525-2-31 is technically identical.

IS 694:2010 vs IEC 60227 — Voltage Advantage

Same construction. Higher test voltage. Certified to a higher voltage class — IS 694:2010 is genuinely over-engineered for 450/750V IEC applications.

IS 694:2010 specifies working voltages up to and including 1100V (per Amendment No. 3, July 2015). IEC 60227-3 specifies 450/750V for the H07V series. The conductor material, insulation compound (PVC Type TI1), and insulation wall thicknesses are identical between the two standards; the test voltages differ — IEC 60227-2 applies 2.5kV AC (5 min), IS 694:2010 applies 3.0kV AC (5 min). The difference is the voltage classification: IS 694:2010 certifies the same physical construction to a higher voltage rating, applying a more conservative voltage class to an equivalent dielectric. When a buyer specifies H07V at 450/750V and receives IS 694:2010 wire rated at 1100V, they receive a cable with genuine dielectric overcapacity — not just a paperwork equivalence. This provides a real engineering margin on projects where transient switching voltages, motor starting surges, or long feeder runs create voltage spikes above nominal.

IS 694:2010 — 1100V rated IEC 60227-3 — 450/750V rated Test voltage: 2.5kV AC (IEC 60227-2) · 3.0kV AC (IS 694:2010) Insulation thickness — identical per size PVC compound TI1 — identical IEC 60228 conductors — identical

Engineering Margin

1100V Dielectric Over-Delivery

National Cables' IS 694:2010 production provides a 47% higher voltage rating (1100V vs 750V) on the same IEC insulation wall. This provides a critical safety margin against transient switching surges and motor starting spikes common in industrial power systems.

Standard Test Voltage

While IEC 60227-3 requires a 2.5kV AC test, National Cables subjects every MTO export batch to a 3.0kV AC high-voltage withstand test to ensure absolute insulation integrity.

Technical Specification

Construction and electrical characteristics.

Parameter	H07V-U	H07V-R	H07V-K
Standard	IEC 60227-3 / EN 50525-2-31	IEC 60227-3 / EN 50525-2-31	IEC 60227-3 / EN 50525-2-31
Rated voltage (U₀/U)	450/750V	450/750V	450/750V
Manufacturing voltage	1100V — IS 694:2010 (exceeds IEC requirement)
Conductor material	Plain annealed electrolytic copper, IEC 60228
Conductor class	Class 1 — solid	Class 2 — standard stranded	Class 5 — fine stranded
Insulation	PVC Type TI1 (IEC 60227-1) / Type A (IS 5831:1984)
Max conductor temperature	70°C continuous · 160°C short circuit (5s)
Test voltage	2.5kV AC (5 min) — per IEC 60227-2 (IS 694:2010 routine test: 3.0kV AC, 5 min)
Min. bending radius (static)	3–4 × OD (size-graded)	3–5 × OD (≤10mm²: 3× · 10–25mm²: 4× · >25mm²: 5×)	4–6 × OD (cable OD ≤8mm: 4× · 8–12mm: 5× · >12mm: 6×)
Flame retardant	Yes — IEC 60332-1-2:2004 / IS 10810 (Part 53):1984
Min. installation temperature	+5°C (installation) · −30°C (static)
Core identification	IEC: Brown, Blue, Green/Yellow, Black, Grey · IS 694:2010 — Red, Black, Yellow/Green
Size range	1.5–10mm²	1.5–240mm²	1.5–240mm²
Packing	100m coils (≤6mm²) · 500m/1000m drums (larger)

Construction Diagram

Cross-section — H07V single core.

Diagram: Class 2 seven-strand layout (H07V-R). H07V-U: solid; H07V-K: fine-stranded Class 5.

PVC insulation Type TI1 — wall per IEC 60227-3 / IS 694:2010 No outer sheath — non-sheathed single core. For use in conduit, trunking, or closed duct only.

Specialized OEM Specification

Tinned Copper Conductor Variant

Available for H07V-K (Flexible) and H07V-R (Stranded) variants. High-purity Electro-Tinned Copper (ASTM B33) prevents conductor oxidation in saline, marine, or corrosive chemical environments, ensuring reliable terminal contact life.

Dimensional Data

Conductor stranding, OD, weight and resistance — H07V-R (Class 2).

H07V-U is solid Class 1 (1.5–10mm²) — dimensional data on request. 1100V export building wire dimensional data — OD values and weights compliant with IEC 60227-3 nominal dimensions and IS 694:2010 Annex B tolerances. Resistance values per IEC 60228:2004 Table 1–2. Cross-verified against BS EN 50525-2-31:2011 published values. Optional ASTM B33 tinned wire builds quoted on MTO request. Insulation-resistance constant ≥ 0.037 MΩ·km at 70°C per IS 5831 (Type A PVC).

Size (mm²)	Stranding	Insulation (mm)	OD approx (mm)	Weight (kg/km)	Max R Class 1/2 (Ω/km)
1.5	7/0.53	0.7	2.9	22	12.1
2.5	7/0.67	0.8	3.6	32	7.41
4.0	7/0.85	0.8	4.1	50	4.61
6.0	7/1.04	0.8	4.7	71	3.08
10.0	7/1.35	1.0	5.9	110	1.83
16.0	7/1.70	1.0	6.8	164	1.15
25.0	7/2.14	1.2	8.4	256	0.727
35.0	7/2.52	1.2	9.4	346	0.524
50.0	19/1.78	1.4	11.0	473	0.387
70.0	19/2.14	1.4	12.7	674	0.268
95.0	19/2.52	1.6	14.7	913	0.193
120.0	37/2.03	1.6	16.2	1150	0.153
150.0	37/2.27	1.8	18.0	1416	0.124
185.0	37/2.52	2.0	20.0	1749	0.0991
240.0	37/2.87	2.2	23.0	2317	0.0754

Dimensional Data — H07V-K Class 5

Fine-stranded conductor — OD, weight and resistance.

Per IEC 60227-3 / IS 694:2010 conductor classes; values cross-checked against BS EN 50525-2-31.

Size (mm²)	OD approx (mm)	Weight (kg/km)	Max R Class 5 (Ω/km) at 20°C
1.5	2.96	20	13.3
2.5	3.62	32	7.98
4.0	4.16	48	4.95
6.0	4.73	68	3.3
10.0	6.08	114	1.91
16.0	7.12	171	1.21
25.0	8.78	264	0.78
35.0	9.98	361	0.554
50.0	11.87	517	0.386
70.0	13.55	710	0.272
95.0	15.74	962	0.206
120.0	17.28	1198	0.161
150.0	19.21	1475	0.129
185.0	21.49	1851	0.106
240.0	24.23	2370	0.0801

Current Carrying Capacity — H07V-U / H07V-R

Rated current in amperes — four installation methods.

Per BS 7671:2018+A2:2022 Table 4D1A. Ambient temperature 30°C. Conductor temperature 70°C (PVC). Copper conductor. For ambient temperatures other than 30°C apply the de-rating factors below.

Size (mm²)	Method A Conduit in insulated wall		Method B Conduit on wall/trunking		Method C Clipped direct		Method F Free air / cable tray		Max R Ω/km
Size (mm²)	2-cable 1φ A	3/4-cable 3φ A	2-cable 1φ A	3/4-cable 3φ A	2-cable 1φ A	3/4-cable 3φ A	Horiz.	Vert.
1.5	14.5	13.5	17.5	15.5	20	18	-	-	12.1
2.5	20	18	24	21	27	25	-	-	7.41
4.0	26	24	32	28	37	33	-	-	4.61
6.0	34	31	41	36	47	43	-	-	3.08
10.0	46	42	57	50	65	59	-	-	1.83
16.0	61	56	76	68	87	79	-	-	1.15
25.0	80	73	101	89	114	104	146	130	0.727
35.0	99	89	125	110	141	129	181	162	0.524
50.0	119	108	151	134	182	167	219	197	0.387
70.0	151	136	192	171	234	214	281	254	0.268
95.0	182	164	232	207	284	261	341	311	0.193
120.0	210	188	269	239	330	303	396	362	0.153
150.0	240	216	300	262	381	349	456	419	0.124
185.0	273	245	341	296	436	400	521	480	0.0991
240.0	321	286	400	346	515	472	615	569	0.0754

Method A: enclosed in conduit in a thermally insulating wall. Method B: enclosed in conduit on a wall or in trunking. Method C: clipped direct to surface. Method F: free air or perforated cable tray. Values in amperes.

Current Carrying Capacity — H07V-K

Class 5 fine-stranded — rated current in amperes.

Per BS 7671:2018+A2:2022 Table 4D1A, 30°C ambient, 70°C conductor. Class 5 values are marginally lower than Class 2 due to lower copper packing density. Ambient correction factors per IEC 60364-5-52 Method 'C' / IS 3961 (Part 2):2017.

Size (mm²)	Method A Conduit in insulated wall		Method B Conduit on wall/trunking		Method C Clipped direct		Method F Free air / cable tray		Max R Ω/km
Size (mm²)	2-cable 1φ A	3/4-cable 3φ A	2-cable 1φ A	3/4-cable 3φ A	2-cable 1φ A	3/4-cable 3φ A	Horiz.	Vert.
1.5	13.8	12.8	16.6	14.7	19	17	-	-	13.3
2.5	19	17	23	20	26	24	-	-	7.98
4.0	25	23	30	27	35	31	-	-	4.95
6.0	32	29	39	34	45	41	-	-	3.3
10.0	44	40	54	48	62	56	-	-	1.91
16.0	58	54	72	65	83	75	-	-	1.21
25.0	78	71	98	86	111	101	142	126	0.78
35.0	96	86	121	107	137	125	176	157	0.554
50.0	115	105	146	130	177	162	212	191	0.386
70.0	146	132	186	166	227	208	273	246	0.272
95.0	177	159	225	201	275	253	331	302	0.206
120.0	204	182	261	232	320	294	384	351	0.161
150.0	233	210	291	254	370	339	442	406	0.129
185.0	265	238	331	287	423	388	505	466	0.106
240.0	311	277	388	336	500	458	597	552	0.0801

De-rating Factors

Ambient temperature correction for African and Middle East installations.

Values above at 30°C ambient. For Africa, Gulf, and Middle East installations, multiply the tabulated rating by the factor for your site ambient temperature.

Ambient Temp

Factor

25°C

1.03

30°C

1.0

35°C

0.94

40°C

0.87

45°C

0.79

50°C

0.71

55°C

0.61

60°C

0.5

Example: 10mm² H07V-R clipped direct (Method C) = 65A at 30°C. At 45°C ambient in Lagos or Dubai: 65 × 0.79 = 51A.

HAR Mark — What It Is and What It Means for Buyers

The HAR mark certifies product conformance under the CENELEC harmonisation agreement.

The HAR mark is the CENELEC harmonisation certification — applied by an accredited national test institute (VDE, KEMA, SETI, IECEE) confirming conformance to the applicable harmonised standard. For H07V-K/U/R, the governing harmonised standard is EN 50525-2-31, technically identical to IEC 60227-3.

A HAR mark confirms factory quality certification, independent testing by a recognised test institute, and periodic sample re-testing. The construction requirements — materials, wall thicknesses, test voltages — are identical to IS 694:2010 for equivalent sizes.

IS 694:2010 — BIS licence CM/L-8800140116. HAR mark testing is available through accredited IECEE CB bodies for volume orders requiring EU public procurement compliance. Full BIS test certificates provided with every shipment — accepted across Africa and Middle East markets.

Markets

Where H07V is specified.

H07V is the dominant building wire specification across Europe, Sub-Saharan Africa, North Africa, and the Middle East. Any project specifying cable to IEC 60227 accepts H07V-series cable.

West Africa

Nigeria, Ghana, Côte d'Ivoire

IEC 60227-3 H07V specification widely accepted

East Africa

Kenya, Tanzania, Uganda

IEC 60227 accepted; BS 6004 also common on British-specification projects

North Africa

Egypt, Morocco, Algeria

IEC 60227 / NF C 32-201 (France-aligned markets); Egyptian ES standard in Egypt

GCC / Gulf

UAE, Saudi Arabia, Kuwait, Qatar

IEC 60227 / SASO 2650 (Saudi); DEWA / ADDC project specs in UAE

Southeast Asia

Vietnam, Indonesia, Philippines

IEC 60227-3 building wire — standard IEC market

Europe

All EU / EEA markets

EN 50525-2-31 harmonised; HAR mark required for public contracts

Industrial OEM

Switchgear & Controlgear

Internal H07V-K wiring for LV distribution boards, MCCs, and PLC marshalling cabinets.

Domestic Equivalent

The IS 694:2010 products this is manufactured from.

IS 694:2010 · BIS Certified

FR Single Core Wire — Indian Standard

Class 2 conductor, IS 694:2010, 1100V — the domestic product from which H07V-U/R export product is derived. Full BIS compliance documentation available.

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IS 694:2010 · BIS Certified

Single Core Flexible Wire — Indian Standard

Class 5 fine-stranded conductor — the domestic product from which H07V-K export product is derived.

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Frequently Asked Questions

H07V-U, H07V-R and H07V-K — technical questions answered.

Common questions from European EPC contractors, MENA project consultants, African distribution buyers, and international panel builders specifying harmonised 450/750V single core building wire.

What is the difference between H07V-K, H07V-R, and H07V-U?

All three share the same 450/750V PVC insulation harmonised to IEC 60227-3 and differ only in conductor construction.

H07V-U uses a Class 1 solid copper conductor — economical for straight conduit runs but stiff.

H07V-R uses a Class 2 stranded copper conductor — slightly flexible for general building wiring.

H07V-K uses a Class 5 fine-stranded flexible conductor — ideal for panel wiring and routes with multiple bends.

Selection depends on installation topology and termination method. All three are manufactured by National Cables harmonised to HAR specification.

Which is better for conduit installations, H07V-U or H07V-R?

For conduit installations with straight runs and few bends, H07V-U (solid conductor) is cost-effective and easy to push through.

For conduits with multiple bends or complex routing, H07V-R (stranded) or H07V-K (fine-stranded flexible) navigates corners without conductor damage.

H07V-U tends to hold its shape and fight tight bends, while H07V-R allows gentle curvature during pulling. Select based on your specific conduit topology — straight runs favour U, complex routes favour R or K.

What is the maximum voltage rating for H07V series cables?

The entire H07V series (H07V-U, H07V-R, H07V-K) is rated 450/750V AC per the harmonised HAR designation — the "07" index indicates the 450/750V voltage class.

This is suitable for building wiring, panel wiring, and fixed installation in systems with nominal voltage up to 750V. Do not confuse H07V products with 0.6/1kV power cables such as NYY-J — different voltage class, different application.

National Cables manufactures H07V cables harmonised to IEC 60227-3 at the 450/750V rating.

Are H07V cables suitable for external or outdoor use?

No. H07V-U, H07V-R, and H07V-K are non-sheathed single-core cables designed for protected fixed installation — inside conduit, trunking, or embedded in plaster. They have no outer sheath and the PVC insulation degrades under prolonged UV exposure.

For outdoor installations, route H07V cables inside UV-resistant conduit or trunking. For unprotected outdoor power cable requirements, specify a sheathed cable family such as NYY-J to VDE 0276 / IEC 60502-1, which is designed for external conditions.

Enquire for export pricing.

High-value project orders. Container-load logistics (LCL/FCL) for Middle East and African markets. 24-hour technical pricing response.

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H07V-U · H07V-R · H07V-KBuilding wire for Europe and Africa.