Other sources of dangers - week two

WEEK 2
Other sources of dangers
These are as follows:
1. Unprotected electric heaters
2. Over-loaded or over fused cables particularly flexes (ie flexible cable)
3. Unguarded crane trolley wires or bare overhead conductors, particularly where non-electrical worker are in the vicinity
4. Unprotected or unearthed socket outlets.
5. Poor or broken earth connections leading to live mental work under fault conditions.
Points of dangers for the electrician
1. Burns: Electrical burns are generally more dangerous (and more painful) than normal burns as they are usuallycaused by an arc containing moltenmetal.
2. Falls: A very large percentage of industrial accidents are caused by falls either from a height or by workers tripping over equipment left lying.
3. Ladder: points to note:
- Ladders should always be placed at reasonable angle to the vertical
- Ladder should be anchored on a non-slip surface or effectively wedged.
- Aluminum ladder should be use with great caution particularly near bare conductors.
- Do not attempt to lift heavy equipment (for example conduit lengths) up or down a ladder unaided
4. Strains: Strains occur through attempt to lift over heavy weights or by lifting weights in correct.
NOTE: To lift heavy objects from ground levels place the feet apart, get a good grip with the finger, keep the fingers, keep the back straight and lift by straightening the knees.
5. Electric shock: This is one of the main hazards in our craft. It is not always possible to work on dead conductors but certain precautions may be taken. They are as follows.
a. Never assume that an installation is dead: check thoroughly before opening equipment, and do not check by touching conductors with fingertrips.
b. Check circuit thoroughly before replacing a re-loaded fuse in a live DFB and if still in doubt, replace with gloves, always keep your face clear.
c. If working on an installation to which other people have access, remove fuses and keep them beside you.
6. Moving machinery:Great care should be taken when working on moving machinery oil rags and ties should be kept well clear. Do not remove guards and if it becomes necessary to remove a guard, do so when the machinery is stationary replace all guards before leaving a machine.
NB: Goggle should always be worn when operating a grinder and particular care should be taken when drilling and grinding soft metals (for example brass and copper)
Evaluation
1. State other five source of danger in electrical workshop
2. What are the precaution to avoid electric shock.
Assignment
1. State any ten IEEE requirement for temporary installation
2. What is electric shock.