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Cables & Wiring — Frequently Asked Questions

Glossary & TermsWhat is a Uninyvin cable?A Uninyvin cable is a specialised single-core flexible wire built for demanding, mission-critical wiring —…Cable BasicsHow do I choose a speaker cable?A speaker cable carries the audio signal from an amplifier to loudspeakers. The keys to good sound are…Glossary & TermsWhat is a CATV (cable-TV) cable?A CATV cable carries cable-television and broadband signals. It is a coaxial cable — a central conductor…ApplicationsWhich cable do CCTV cameras need?Most analog CCTV cameras use a coaxial cable, commonly an RG-59 '3+1' type — a coaxial core for the video…Cable BasicsWhat is a LAN cable, and what’s the difference between Cat5e and Cat6?A LAN (Ethernet) cable connects computers, routers and devices for wired networking and internet. Inside are…Cable BasicsCopper vs aluminium multicore cable — which should I choose?It is the same trade-off as for any copper vs aluminium conductor. Copper multicore (APAR Shakti /…Glossary & TermsWhat is XLPO insulation?XLPO stands for Cross-Linked Polyolefin. Like XLPE, the polymer chains are cross-linked into a thermoset, so…ApplicationsWhich cable is best for a submersible pump?Submersible pumps need a cable built for the worst conditions — underwater, underground, in mud and constant…Cable BasicsWhat is the difference between round and flat multicore cable?Both bundle several insulated cores together; the difference is the shape. Round multicore is the…Glossary & TermsWhat is an eco-friendly (green) house wire?An eco-friendly or 'green' house wire is made with safer, more sustainable materials — typically lead-free,…Fire Safety & StandardsWhat is the difference between FR-LSH and FR-PVC wire?Both are flame-retardant house wires. FR-PVC resists the spread of flame on standard PVC insulation —…Fire Safety & StandardsWhat is HR-FR-PVC wire, and how is it different from HR-FR-LSH?HR-FR-PVC is a Heat-Resistant, Flame-Retardant PVC house wire. It adds heat resistance (around 105 °C)…Buying & SizingWhat does ‘50% more current-carrying capacity’ mean?It means the wire can safely carry significantly more current than an ordinary PVC wire of the same conductor…Glossary & TermsWhat is self-extinguishing wire?A self-extinguishing (flame-retardant) wire is one whose insulation stops burning on its own once the source…Fire Safety & StandardsWhat temperature can HR-FR-LSH house wire handle?HR-FR-LSH stands for Heat-Resistant, Flame-Retardant, Low Smoke & Halogen — and the 'HR' is the key here.…Fire Safety & StandardsWhat certifications make a house wire fire-safe?For a house wire, fire safety is proven by testing to recognised standards. Look first for the ISI mark…Glossary & TermsWhat is dielectric strength in a cable?Dielectric strength is the maximum electric field a cable's insulation can withstand before it breaks down…Home Electrical SafetyWhat is short-circuit protection in house wiring?A short circuit is when live and neutral (or earth) accidentally touch, causing a huge surge of current.…Glossary & TermsDoes e-beam (electron-beam) wire melt? What is melt-resistant wire?Ordinary thermoplastic insulation softens and can melt or drip as it gets hot. Electron-beam cross-linked…Glossary & TermsWhat is EBXL HFFR wire?EBXL HFFR describes a premium fire-safe house wire. EBXL means Electron-Beam Cross-Linked — the insulation is…ApplicationsWhat wiring does a home EV charger need?A home EV charger draws a high, sustained current, so it needs its own dedicated circuit sized to the charger…ApplicationsHow do I wire a new home to be smart-home and future-ready?Future-ready wiring plans for the loads of the next decade, not just today. The essentials: a distribution…Buying & SizingCan better house wire actually lower my electricity bill?To a small but real degree, yes. Higher-quality wire uses high-purity copper with lower conductor resistance,…Buying & SizingWhat is the difference between concealed and conduit (surface) wiring?Concealed wiring runs cables through conduits buried inside walls and ceilings, so nothing is visible — the…Buying & SizingHow many watts can a 1.5, 2.5 or 4 sq mm wire carry?As a rough guide for 230 V single-phase home circuits: a 1.5 sq mm wire suits lighting and light…Cable BasicsWhat are anti-rodent and anti-termite wires?Rats and termites are a real cause of hidden wiring damage — they gnaw through ordinary insulation, exposing…Cable BasicsWhy does pure (electrolytic) copper matter in house wire?The quality of the copper conductor directly affects safety and performance. High-purity electrolytic-grade…Cable BasicsWhat is the difference between a wire and a cable?People use the words interchangeably, but technically a wire is a single conductor (one strand or a bundle of…Home Electrical SafetyDoes my home need a surge protector?A surge protector guards your appliances against sudden voltage spikes — from lightning, grid switching or…Home Electrical SafetyWhat do the wire colours mean in Indian house wiring?Colour coding lets electricians identify each conductor's role safely. Under the older Indian convention,…Home Electrical SafetyHow often should home wiring be inspected or replaced?As a general guide, have a qualified electrician inspect your home wiring every few years, and consider a…Home Electrical SafetyWhy do my switches or plug points feel warm or make a buzzing sound?A switch, socket or plug that feels warm, crackles or buzzes is almost always a sign of a loose connection or…Home Electrical SafetyWhat is an RCCB (or ELCB), and do I need one?An RCCB (Residual Current Circuit Breaker), sometimes called an ELCB, is a life-safety device that constantly…Home Electrical SafetyWhat is earthing, and why does it matter at home?Earthing (grounding) gives stray electricity a safe path into the ground instead of through a person. If a…Home Electrical SafetyWhat is an MCB and why does every home need one?An MCB (Miniature Circuit Breaker) is the switch in your distribution board that automatically cuts power to…Home Electrical SafetyWhat are the warning signs of faulty or ageing house wiring?Wiring rarely fails without warning. Watch for: frequently tripping MCBs, flickering or dimming lights,…Glossary & TermsWhat does the ISI mark / BIS certification mean?The ISI mark is a certification mark showing that a product conforms to the relevant Indian Standard set by…Glossary & TermsWhat is a solar (PV) cable?A solar cable (or PV cable) is a cable designed specifically for photovoltaic systems — it carries direct…Glossary & TermsWhat is an elastomeric cable?An elastomeric cable uses rubber-like (elastomer) materials — such as EPR, silicone or similar compounds —…Glossary & TermsWhat is a coaxial cable?A coaxial cable has a distinctive layered construction: a central conductor, surrounded by an insulating…Glossary & TermsWhat is an optical fibre cable (OFC)?An optical fibre cable (OFC) carries information as pulses of light travelling through hair-thin strands of…Glossary & TermsWhat is MVCC (Medium Voltage Covered Conductor)?MVCC stands for Medium Voltage Covered Conductor. It is an overhead distribution conductor that, unlike a…Glossary & TermsWhat is the sheath of a cable?The sheath is the outermost protective covering of a cable. It wraps and protects the insulated conductors…Glossary & TermsWhat is the conductor in a cable?The conductor is the metal core of a cable — the part that actually carries the electric current. Everything…Glossary & TermsWhat is an armoured cable?An armoured cable has a layer of metal armour — usually steel wire (SWA) or steel tape (STA) — built in…Glossary & TermsWhat is LSZH (low smoke zero halogen) cable?LSZH (also written LSOH or LS0H) stands for Low Smoke Zero Halogen. It describes cables whose insulation and…Glossary & TermsWhat does ampacity (current-carrying capacity) mean?Ampacity — short for 'ampere capacity', also called current-carrying capacity — is the maximum electric…Glossary & TermsWhat does a cable’s voltage grade mean?A cable's voltage grade is the maximum working voltage its insulation is designed and tested to withstand…Glossary & TermsWhat is PVC insulation in cables?PVC (polyvinyl chloride) is the most widely used insulation material in electrical cables. It is a…Glossary & TermsWhat is XLPE insulation?XLPE stands for Cross-Linked Polyethylene. Ordinary polyethylene (PE) is already an excellent electrical…ApplicationsWhich cables are used for wind energy?Wind turbines place unusual demands on cable. Inside the nacelle and the twisting tower loop, cables must…ApplicationsDo outdoor or underground cable runs need special cables?Yes — outdoor and underground runs need cable specifically rated for those conditions, because ordinary…ApplicationsWhat cables are used in railways and metros?Railways and metros use highly specialised cables built for safety, reliability and harsh service — constant…ApplicationsWhich cables suit industrial and factory environments?Factory and industrial environments are demanding — heat, oil, abrasion, vibration and moving machinery — so…ApplicationsWhat wiring is recommended for hospitals and public buildings?Buildings where many people gather or may need to evacuate — hospitals, schools, offices, malls, airports —…ApplicationsWhich cables are used in data centres?Data centres combine three cabling needs: reliable power, high-speed data, and fire safety — all at high…ApplicationsWhat cables does an EV charging setup need?An EV charging setup needs cabling that can handle sustained high current, heat and repeated handling. There…ApplicationsWhich cables are used for rooftop solar installations?A rooftop solar installation uses more than one type of cable, because the DC side and the AC side face…Buying & SizingHow do I place a bulk or project order, or become an APAR dealer?APAR supports both project buyers and trade partners.For a bulk or project order — for a building project,…Buying & SizingHow long do electrical cables last, and when should they be replaced?Good-quality electrical cable is a long-life product. Installed correctly and not overloaded, quality house…Buying & SizingCan I use ordinary indoor house wire outdoors?No — ordinary indoor house wire should not be used outdoors. Standard house wiring is designed for protected,…Buying & SizingHow do I choose the right cable for my application?Choosing the right cable comes down to matching the cable to the job and the environment. The main factors to…Cable BasicsWhat is house-wire insulation usually made of?The vast majority of house wiring is insulated with PVC (polyvinyl chloride) — it is tough, flexible,…Cable BasicsWhat is the difference between solid and stranded conductors?This describes how the metal conductor inside a cable is made up.A solid conductor is a single, solid rod of…Cable BasicsWhat is the difference between copper and aluminium conductors?Copper and aluminium are the two metals used for the current-carrying conductor in a cable, and each has its…Cable BasicsWhat do conductor sizes like 1.0, 1.5 and 2.5 sq mm mean?Those numbers — 1.0, 1.5, 2.5 and so on — are the cross-sectional area of the conductor in square millimetres…Fire Safety & StandardsWhat does the voltage grade (for example 1100V) on a cable mean?The voltage grade printed on a cable — for example 1100 V — is the maximum working voltage its…Fire Safety & StandardsAre low-smoke, low-halogen (LSZH) cables required for homes?For an ordinary home, low-smoke zero-halogen wiring is usually strongly recommended rather than strictly…Fire Safety & StandardsWhat is the difference between flame-retardant and fire-resistant cables?These terms sound similar but describe two different jobs, and good specification depends on knowing which…Buying & SizingHow can I check that I’m buying genuine APAR cables?Counterfeit and substandard cable is a real safety risk, so it is worth confirming you are getting genuine…Buying & SizingWhich size of house wire should I use for an air conditioner or geyser?Air-conditioners and geysers are high-power appliances, so they need a heavier cable than lighting or general…Cable BasicsWhat are communication cables used for?Communication cables carry information — data, audio and video signals — rather than mains power. Because…Cable BasicsWhat is the difference between single-core and multi-core cables?The difference is simply how many separately insulated conductors (cores) the cable carries inside it.A…Cable BasicsWhat is electron-beam (e-beam) cross-linking, and why does it matter for cables?Electron-beam (e-beam) cross-linking is an advanced, environmentally clean way of strengthening cable…Fire Safety & StandardsWhat standards should house-wiring cables comply with in India?House-wiring cables sold in India should comply with the relevant Bureau of Indian Standards (BIS)…Fire Safety & StandardsWhy does low-smoke, low-halogen cable matter for fire safety?In most fatal building fires it is not the flames that cause the greatest harm first — it is the smoke and…Fire Safety & StandardsWhat is the difference between FR, FR-LS and HR-FR-LSH wires?These three markings describe a ladder of fire-safety performance in house wiring — each step adds protection…Fire Safety & StandardsWhat does HR-FR-LSH mean on a wire or cable?HR-FR-LSH is a grade marking you will see on premium Indian house wiring. It is a stack of three safety…