Haryana BSEH Secondary NSQF Power cheat sheet

India's power value chain runs generation → transmission → distribution → consumption; NSQF Power sector roles exist at each stage.

Sector segments: central PSUs (NTPC, NHPC, POWERGRID), state utilities (HVPNL, DHBVN, UHBVN in Haryana), private IPPs, and renewable developers.

Haryana state utilities: HPGCL (generation), HVPNL (state transmission), DHBVN and UHBVN (distribution).

NSQF levels map to job roles: Level 3 helper/assistant, Level 4 skilled technician (electrician, lineman), Level 5 supervisor-level technician.

Common entry roles: electrician, wireman, lineman, substation attendant, meter reader, cable jointer, solar PV installer.

Career progression path: apprentice/trainee → technician → senior technician → junior engineer (via diploma/degree) → section officer.

Certification bodies: NCVET recognizes sector skill councils; Power Sector Skill Council (PSSC) sets QPs for power job roles.

Self-employment options: licensed electrical contractor, motor rewinding shop, solar rooftop installer, appliance repair service.

Current magnitude governs injury: roughly 1 mA perception, 10–15 mA muscle tetanus, 30 mA respiratory distress, above 50–100 mA ventricular fibrillation risk.

Body resistance falls with wet skin (as low as ~500 Ω) versus dry skin (~100 kΩ), so wet-condition contact is far more lethal at the same voltage.

IE Rules 1956 define low voltage ≤ 250 V, medium 250 V–650 V, high 650 V–33 kV, extra-high above 33 kV.

First aid for electric shock: isolate supply, do not touch the casualty, then assess breathing and start CPR if trained; call emergency services.

Lockout–tagout (LOTO) rule: isolate, lock, tag, test dead, and prove the tester before and after the test.

Arc flash protection: use appropriately rated PPE (helmet with face shield, arc-rated clothing, insulated gloves) and stand clear of the arc boundary.

Earthing is the primary protection: metal enclosures must be earthed so fault current trips the protective device instead of energizing the casing.

Environmental duties: segregate e-waste and used batteries, avoid burning cable insulation, and dispose of transformer oil through authorized recyclers.

Fire class for live electrical equipment is Class C; use CO2 or dry powder, never water or foam on energized circuits.

Ohm's law: V = I × R; power P = V × I = I²R = V²/R.

SI units: volt (V), ampere (A), ohm (Ω), watt (W), joule (J), coulomb (C), farad (F), henry (H), hertz (Hz).

Series circuit: same current, resistances add (R = R1 + R2), voltage divides in proportion to resistance.

Parallel circuit: same voltage, 1/R = 1/R1 + 1/R2, and current divides inversely with resistance.

AC values: RMS = peak/√2 ≈ 0.707 × peak; average of a full sine cycle is zero.

Frequency in India is 50 Hz, giving a period of 20 ms and one cycle per 20 ms.

Three-phase relations: line voltage = √3 × phase voltage in star; line current = √3 × phase current in delta.

Power factor: P = V × I × cos φ for single-phase AC; lower power factor means more current for the same real power.

Energy billing: 1 unit = 1 kWh = 1000 W for 1 hour; energy (kWh) = power (kW) × time (h).

Conductors: copper (best practical conductivity, ~1.68 × 10⁻⁸ Ω·m), aluminium (lighter, cheaper, ~2.65 × 10⁻⁸ Ω·m, needs larger cross-section).

Insulators: PVC (up to ~70 °C), XLPE (up to ~90 °C conductor), rubber, porcelain, glass, and SF6 gas for high-voltage insulation.

Magnetic materials: soft iron and silicon steel (transformer cores) have high permeability and low hysteresis; hard materials suit permanent magnets.

Fuse wire is a low-melting alloy (tin–lead) chosen so it melts before the conductor overheats.

Cable designation: e.g. 3 × 2.5 sq mm PVC copper means three cores of 2.5 mm² cross-section; current rating depends on cross-section and installation method.

Contact materials for switches and relays need low contact resistance and resistance to arcing (silver alloys, copper).

Semiconductors (silicon, germanium) conduct only under doping/field and are the basis of diodes, LEDs, and solar cells.

Soldering alloys are tin–lead or lead-free tin–silver; flux removes oxide so the joint wets properly.

Insulated hand tools must carry a rated voltage marking (e.g. 1000 V) and be visually checked for insulation damage before each use.

Ammeter connects in series with the load and has very low resistance; voltmeter connects in parallel and has very high resistance.

Multimeter functions: voltage (AC/DC), current, resistance, continuity, and diode test; select the correct range and function before probing.

Megger (insulation resistance tester) applies 500 V or 1000 V DC and reads in megohms; a healthy LV installation typically reads ≥ 1 MΩ.

Clamp meter measures current without breaking the circuit by sensing the magnetic field around a single conductor.

Earth tester (three- or four-pole) measures earth electrode resistance; a good value is generally below 5 Ω for domestic installations.

Energy meter (kWh meter) records accumulated energy; a tachometer and lux meter serve motor speed and illumination checks respectively.

Continuity test confirms a low-resistance path; always zero/verify the instrument on a known live-free source first.

Tools for conduit work: hacksaw, die and stock for threading, bending spring, fish tape, and crimping tool for lugs.

Domestic wiring systems: cleat, casing-and-capping, batten, conduit (surface or concealed), and cable tray for industrial runs.

Conduit sizing rule: total cable cross-sectional area should not exceed about 40% of the conduit internal area.

Wire colour convention (India): phase red/yellow/blue, neutral black, earth green or green-yellow.

Lighting sub-circuit wiring uses 1.5 mm² copper; power socket circuits use 2.5 mm² or 4 mm²; main incoming cable is sized larger.

Two-way switch control needs two strapper wires between the switches plus the common feed and the load wire.

Staircase and godown wiring use multi-way switching; godown wiring lets lamps be switched from successive positions along a run.

Earthing systems: plate earthing and pipe earthing; earth wire size is typically half the phase conductor up to a limit.

Testing before energizing: insulation resistance, earth continuity, polarity, and earth electrode resistance.

Loop-in loop-out is the preferred lighting method because it avoids joints inside ceiling roses and keeps junctions accessible.

MCB protects against overload and short circuit; its curve type (B, C, D) sets the instantaneous trip multiple-B is 3–5 × In, C is 5–10 × In.

RCCB (ELCB) protects people against earth leakage and has no overload protection; typical sensitivity is 30 mA for personal protection.

RCBO combines overcurrent and earth-leakage protection in one device.

Fuse rating rule: fuse current should exceed normal load current but be below the cable's current-carrying capacity.

Earthing provides a low-resistance fault path so the protective device trips quickly; it also limits touch voltage.

Lightning arresters divert surge current to earth; surge protection devices clamp transient overvoltages at the distribution board.

Isolator (main switch) breaks the supply for maintenance but is not intended to break load current; a switch-fuse does both.

Motor protection uses overload relays (thermal) plus short-circuit protection (MCB/fuse) and, for large motors, contactors with starters.

Selection rule: protective device rating ≥ design load current and ≤ cable capacity, with breaking capacity above prospective fault current.

Conventional generation: thermal (coal), hydro, nuclear, gas; non-conventional: solar PV, wind, biomass, small hydro.

Transmission uses high voltage (132/220/400 kV in India) to reduce I²R losses, since loss falls as voltage rises for the same power.

Step-up transformers at generating stations, step-down at substations; distribution levels are 11 kV and 33 kV, then 415 V three-phase to consumers.

Indian grid voltage classes: 765 kV, 400 kV, 220 kV, 132 kV transmission; 33/11 kV sub-transmission; 415/240 V distribution.

Solar PV: cell → module → string → array; a typical module has 60 or 72 cells and an open-circuit voltage around 30–45 V.

Load dispatch centres balance generation against demand; frequency deviation (50 Hz nominal) indicates supply–demand mismatch.

Distribution transformers are usually 11 kV/415 V, three-phase, oil-cooled, delta-star connected with neutral brought out for earthing.

Transmission line losses are reduced by bundled conductors, high voltage, and reactive power compensation.

Transformer principle: mutual induction between two windings on a common core; turns ratio V1/V2 = N1/N2 = I2/I1.

Transformer losses: copper loss (I²R, varies with load) plus iron loss (hysteresis and eddy current, roughly constant at fixed voltage and frequency).

Transformer does not change frequency; it works only on AC, not steady DC.

DC motor: back EMF opposes supply; speed rises with voltage and falls with load; a series motor must never be started unloaded.

Three-phase induction motor: rotating magnetic field at synchronous speed Ns = 120f/P; slip = (Ns − Nr)/Ns, typically 2–5% at full load.

Star-delta starter reduces starting current to about one-third of direct-on-line value because phase voltage drops by √3.

Single-phase motors: capacitor-start, capacitor-run, and shaded-pole types; capacitor motors give higher starting torque.

Generator principle: EMF induced when a conductor cuts magnetic flux (Faraday's law); direction follows Fleming's right-hand rule, motors use the left-hand rule.

Resume essentials: contact details, objective, education with NSQF level, technical skills, certifications, and work experience in reverse chronological order.

Job application structure: subject line, reference to the advertised post, brief self-introduction, and a polite closing with enclosures listed.

Workplace communication channels: oral instructions, written work orders, logbooks, shift handover notes, and safety briefings.

Active listening technique: maintain eye contact, avoid interrupting, paraphrase back, and confirm instructions before acting.

Email etiquette: clear subject, short paragraphs, no slang, proofread, and reply within the expected time.

Interview preparation: research the employer, prepare examples of hands-on work, and answer using situation–action–result structure.

Teamwork and discipline: punctuality, PPE compliance, reporting hazards, and following the supervisor's chain of command.

Digital literacy: use of basic spreadsheets, online job portals, government skill portals, and digital payment or documentation tools.

Entrepreneurship basics: costing a job (material + labour + overhead + margin), quoting to customers, and maintaining basic accounts.