Electrical Safety in Construction Sites

Only available on StudyMode
  • Download(s) : 207
  • Published : September 12, 2010
Open Document
Text Preview
ELECTRICAL SAFETY
IN

1

CONSTRUCTION
NATIONAL SAFETY DAY 2007

Environment, Health And Safety
Karnataka State Safety Institute JNB/March 2007

The Times Of India
March 9, 2007, Page 3
2

Page 3 has become popular for the society & fashion info

Karnataka State Safety Institute

JNB/March 2007

ELECTRICAL SAFETY
IN

3

CONSTRUCTION
NATIONAL SAFETY DAY 2007

Environment, Health And Safety
Karnataka State Safety Institute JNB/March 2007

Electrical Safety
Shock 4 • Electrical Shock • Fire originating from Electricity Fire • Due to motion powered by Motive Power Electricity, (tools) • Environmental safety Environment influence: Lighting, Signs, Detection Karnataka State Safety Institute JNB/March 2007

Construction Work
• • • • Labour Intensive, Majority Unskilled 5 More widespread than manufacturing industry Relatively Unregulated, Unorganised, Less concern for workmen safety Lack of training and enforcement or rules & regulations Floating or constantly changing work place, even within the same project Karnataka State Safety Institute JNB/March 2007

Safety from Electrical Shock
Causes of Shock, Contact, Leakage, Fault
6

Wiring regulations not followed, terminations, joints, undersized, wrong type of insulation Temporary Installations, defective & aged equipment Karnataka State Safety Institute JNB/March 2007

7

Karnataka State Safety Institute

JNB/March 2007

contact with overhead powerlines:
Stay on equipment. Don't touch equipment and ground at the same time. Keep others away. Warn everyone not to touch the equipment or its load. Break contact. If possible, break contact by moving the equipment clear of the wires. Call local utility. Jump clear.. Karnataka State Safety Institute JNB/March 2007

8

A tower crane was lowering a concrete bucket to be filled by a truck. The wind blew the hoist line and bucket into overhead powerlines. A worker trying to pull the bucket back was electrocuted. Karnataka State Safety Institute JNB/March 2007

9

A worker was changing the bulb in a light fixture that had been incorrectly wired (polarity was reversed). He inadvertently touched the metal base of the bulb while it was in contact with the socket. He received a severe shock and later died in hospital Karnataka State Safety Institute JNB/March 2007

10

A worker was painting a building from a boom-type powered elevating work platform. He backed up without checking how close he was to a powerline. The machine touched the line. Karnataka State Safety Institute JNB/March 2007

11

A driver raised the box on his dump truck to spread gravel under a powerline. When the box contacted the line, he got out of the cab to see what had happened. His foot touched the ground while his hand was still holding the door. He was electrocuted instantly

12

Karnataka State Safety Institute

JNB/March 2007

Eavestrough installer carrying aluminum ladder was electrocuted when it touched powerline. Worker involved in residential demolition working from ladder contacted powerline. Worker using boom truck to install hydro pole anchors contacted overhead wires. Worker moving aluminum ladder contacted overhead powerline.

13

Karnataka State Safety Institute

JNB/March 2007

Current & Duration combined have the effect,

Mild Shock Trip setting for ground fault circuit interrupter Muscle Contractions Victim cannot let go Severe Shock Breathing difficult – possible respiratory arrest

3mA 30mA

100mA

14
>300mA

Also depends on the part of the body thro which the current has flown.

Heart Stops pumping Increasing probability of death Enough current to light a 100-watt bulb

>1 A

Electric Shock
The effect of electric shock on the human body is determined by three main factors: 1. 2. how much current is flowing through the body (measured in amperes and determined by voltage and resistance) the path of current through the body and Karnataka State...
tracking img