GO-DOWN WIRING
Aim: To understand the wiring of go-down / tunnel wiring circuit.
Materials Required:
1. Incandescent Lamp- 230 V, 25 W (3pcs)
2. Lamp holder- 230 V, Level (3 pcs)
3. Switch Box- 4” x 4” (4 pcs)
4. 2 way switch- 230 V, 5 A (3 pcs)
5. 1 way switch- 230 V, 5 A (1pc).
6. P. V. C. casing capping- ¼” (As required)
7. Wooden Board- 4’ x 3.5‘ (1pc)
8. Wires- 1 sq. mm” (As required)
Tools Required: Screw driver, Wire stripper, Hacksaw, combination plier, drilling
machine, electrician knife.
Theory
Go-down wiring uses to operate lamps/loads in a sequential manner, where only one
load operates at a time. As its name implies "Go-down wiring", it is used in go-down,
tunnel like structures, long passages, etc. due to the advantage of the circuit, where
light is only required for passage or it requires only at one position at a time.
Procedure
1. Collect the materials required for this experiment and draw the layout of the
given circuit diagram in the circuit board.
2. Fix the necessary materials, by using drilling machine in the layout board.
3. Terminal 2 of the bulb L1 is connected to neutral point (N) and another terminal
1 is
connected to terminal 1 of switch S2.
4. Terminal 1 of the switch S1 is connected to the phase line (P).
5. Now, the terminal 2 of switch S1 is connected with terminal 2 of switch S2.
6. The terminal 3 of switch S2 is connected with terminal 2 of switch S3.
7. And terminal 3 of Switch S3 is connected with terminal 2 of switch S4.
8. After that, the terminal 3 of switch S4 is connected with terminal 1 of Bulb L4.
Precautions
1. Energize the circuit with the presence of Lab instructor / Faculty.
2. Live circuit should not be touched by the bare hand.
3. Keep any part of your body, out of the circuit.
4. Keep the work area and workbench clear of items not used in the experiment.
5. While connecting the appliance do not apply excessive pressure as this may
lead to malfunctioning.
6. When disassembling a circuit, first disconnect the source of power.
Fuse Rating Calculations
Power drawn by the circuit = 60 watts
Voltage of the circuit = 230 volts
P = V I COS Ø
P = V x I x 1 (Assuming COS Ø = 1 for resistive load)
Current in the circuit (I) = power (P) / Voltage (V)
= 60 W / 230 V = 0.260 AMP.
Fuse rating of the circuit= rounding off the current to the nearest 5 =5A
(Normally fuses are available in the ratings of 5A, 10A and etc.)
Circuit Diagram
Observation
Condition Expected conditions Observed conditions
No.
S1 S2 S3 S4 L1 L2 L3 S1 S2 S3 S4 L1 L2 L3
1 1 1 1 ON OFF OFF 1 1 1 ON OFF OFF
2 2 1 1 OFF ON OFF 2 1 1 OFF ON OFF
ON ON
3 2 2 1 OFF OFF ON 2 2 1 OFF OFF ON
4 1 1 1 OFF OFF OFF OFF 1 1 1 OFF OFF OFF
5 2 1 1 OFF OFF OFF 2 1 1 OFF OFF OFF
OFF
6 2 2 1 OFF OFF OFF 2 2 1 OFF OFF OFF
Applications
1. Go-down wiring circuit is needed in tunnel like structures, warehouses, big go-
downs having lots of rooms and different portions
2. It helps in saving electricity and reducing energy consumption since only one
load i.e. light-bulb can operate at the same time.
Result
Condition-1
Condition-2
Condition-3
Condition-4
Condition-5
Condition-6
SAFETY RULES FOR WORKING WITH
ELECTRICAL EQUIPMENT & TOOLS
1. Avoid contact with energized electrical circuits. Please don’t make fun of this
rule if you already know this (and you probably already know if you are reading
these lines) and remember that if something bad occurs – you probably won’t
have second chance. That’s not funny.
2. Treat all electrical devices as if they are live or energized.
3. Disconnect the power source before servicing or repairing electrical equipment.
4. Use only tools and equipment with non-conducting handles when working on
electrical devices.
5. Never use metallic pencils or rulers, or wear rings or metal watchbands when
working with electrical equipment. This rule is very easy to forget, especially
when you are showing some electrical part pointing with metallic pencil.
6. When it is necessary to handle equipment that is plugged in, be sure hands are
dry and, when possible, wear nonconductive gloves, protective clothes and
shoes with insulated soles.
7. If it is safe to do so, work with only one hand, keeping the other hand at your
side or in your pocket, away from all conductive material. This precaution
reduces the likelihood of accidents that result in current passing through the
chest cavity.
8. Minimize the use of electrical equipment in cold rooms or other areas where
condensation is likely. If equipment must be used in such areas, mount the
equipment on a wall or vertical panel.
9. If water or a chemical is spilled onto equipment, shut off power at the main
switch or circuit breaker and unplug the equipment. NEVER try to remove
water or similar from equipment while energized. Afterall, it’s stupid to do so.
10. If an individual comes in contact with a live electrical conductor, do not touch
the equipment, cord or person. Disconnect the power source from the circuit
breaker or pull out the plug using a leather belt.
11. Do not rely on grounding to mask a defective circuit nor attempt to correct a
fault by insertion of another fuse or breaker, particularly one of larger capacity.
12. Drain capacitors before working near them and keep the short circuit on the
terminals during the work to prevent electrical shock.
13. Enclose all electric contacts and conductors so that no one can accidentally
come into contact with them. If applicable do it always, if not be very careful.
14. Never handle electrical equipment when hands, feet, or body are wet or
perspiring, or when standing on a wet floor.
15. When it is necessary to touch electrical equipment (for example, when checking
for overheated motors), use the back of the hand. Thus, if accidental shock were
to cause muscular contraction, you would not “freeze” to the conductor.
16. De-energize open experimental circuits and equipment to be left unattended.
17. Do not wear loose clothing or ties near electrical equipment.
BIBLOGRAPHY
1. https://www.conceptdraw.com/
2. https://www.electrical-symbols.com/
3. https://www.electricaltechnology.org/
4. https://mechatrofice.com/
5. https://www.circuitstoday.com/
