Electrical engineering drawing ( EED )

Exam point of view question and some diagrams as  shown below..

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In case of electrical installation and circuit it may be very difficult to draw the drawing and write the name of Electrical components and instruments.
The graphical symbols are used to indicate the electrical connections and equipments.

Convention symbols 

General wiring symbol

Socket output symbols

Electrical appliances symbols

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Full forms 

- VIR. Vulcanised Indian rubber 

- PVC.  Poly- vinyl chloride

- TRS. Tough rubber sheathed

- ACSR. Aluminium conductor steel rein- inforced conductor

- DPIC . Double pole iron clad

- TPIC. Triple pole iron clad

- MCB.  Miniature circuit breaker

- VCB. Vacuum circuit breaker

- ACB. Air circuit breaker

- ELCB. Earth leakage circuit breaker

- DP MCB. Double pole miniature circuit breaker

- SWG.  Standard wire gauge

- DB. Distribution board

- SB. Switch board

- MDB. Main distribution board

- ICSB. Iron clad switch board

- HRC. High rupturing capacity

- MCCB. Moulded case circuit breaker

- CCC. Contactor control circuit

- NO. Normally open

- NC. Normally close 

- CR. Current relay

- TDR. Time delay relay

- DOL.  Direct on line starter 

- CT. Current transformer

- PT. Potential transformer

- CPT. Capacitive potential transformer

Lamps and bell diagrams 

Two bell controlled by three push button 

Bell response and motor 

Layout of the electrical service connection 

Wiring of AC and refrigerator

Water heater

20 marks question

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Earthing 

The term earthing means connecting the neutral point of a supply system or the non current carrying metal parts used in electrical distribution system to the general mass of the earth by wire of negligible resistance in such a manner that at all times and immediate discharge of electrical energy takes place without danger. This brings the body of the equipment to zero potential and thus will avoid the shock to the operator . According to Indian Electricity rules the earthing is defined as the earthed or to ensure at all times and immediate discharge of energy without danger . 

Purpose of earthing 

The basic purpose of earthing is to protect the human body from electric shock .

To avoid risk of fire due to earth leakage current through unwanted path.

10 marks question on earthing, it's types 

Difference between plate and pipe earthing 

Electric iron