Similar International Standards
IEC 60502-1:2021International Electrotechnical Commission (IEC), International
HighCurrent
Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) - Part 1: Cables for rated voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV)
Directly covers XLPE insulated cables for rated voltages of 0.6/1 kV and 1.8/3 kV, which aligns with the 1.1 kV and 3.3 kV range.
BS 5467:2016+A1:2018BSI (British Standards Institution), United Kingdom
HighCurrent
Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000 V and 1900/3300 V for fixed installations. Specification
Specifies thermosetting (including XLPE) insulated cables for 600/1000 V and 1900/3300 V, matching the IS scope, though typically specifies armour.
AS/NZS 1429.1:2006Standards Australia / Standards New Zealand, Australia/New Zealand
MediumCurrent
Electric cables - Polymeric insulated - Part 1: For working voltages 1 kV (Um=1.2 kV) up to and including 33 kV (Um=36 kV)
Covers polymeric insulated cables (including XLPE) for voltages from 1 kV upwards, encompassing the range of IS 7098.
Key Differences
≠IS 7098:1988 uses 'working voltage' (e.g., 1.1 kV, 3.3 kV). Modern standards like IEC 60502-1 use a more precise Uo/U (Um) designation, such as 0.6/1 kV (1.2 kV) and 1.8/3 kV (3.6 kV), defining phase-to-earth, phase-to-phase, and maximum system voltages.
≠The IS standard from 1988 specifies basic flame retardance tests (e.g., single cable flame test). Modern international standards often require compliance with a broader suite of fire performance tests for specific applications, including flame propagation on bunched cables (IEC 60332-3), smoke density (IEC 61034), and acidity of gases (IEC 60754).
≠IS 7098:1988 specifies PVC Type ST2 for the outer sheath. While IEC 60502-1 also includes ST2, it provides a much wider range of options, including various low-smoke and halogen-free (LS0H/LSHF) compounds which are now widely specified for safety and environmental reasons.
≠Routine AC voltage test levels differ slightly. For the lower voltage range, IS 7098 specifies 3.0 kV, whereas the equivalent in IEC 60502-1 (for 0.6/1 kV cables) is higher at 3.5 kV.
Key Similarities
≈The fundamental cable construction is identical, specifying annealed copper or aluminium conductors, cross-linked polyethylene (XLPE) for insulation, and a polyvinyl chloride (PVC) outer sheath.
≈All standards recognize a maximum continuous conductor operating temperature of 90°C, which is a primary benefit of using XLPE insulation.
≈The requirement for a 'Hot Set Test' is a common feature. This test is crucial for verifying the degree of cross-linking of the XLPE insulation, ensuring its thermal and mechanical stability at operating temperatures.
≈The types of conductors permitted are the same, including solid or stranded circular and shaped (sectoral) conductors made of copper or aluminium.