What Is The Normal Voltage Range For Residential Power Services
Overhead Powerline
Powerline (Overhead Powerline): In my previous article on electrical safe and portable electrical safety inspection checklist, I highlighted the hazards that accompanies electrical equipment; i.e. (Portable electrical equipment), and the safety precaution which are necessary for safe use of these equipment, with the demand for portable electrical equipment checklist.
This article intends to consider another function of the electrical safety, which is the overhead powerline.
According to wikipedia: "An overhead powerline is a construction used in electric power manual and distribution to transmit electric energy forth big distances. It consists of one or more conductors (usually multiples of iii) suspended by towers or poles."
Types of overhead powerline
There are different types of overhead powerline:
Overhead power transmission lines are classified in the electric ability industry by the range of voltages:
- Low voltage (LV) – less than grand volts, used for connection between a residential or small commercial customer and the utility.
- Medium voltage (MV; distribution) – between 1000 volts (one kV) and 69 kV, used for distribution in urban and rural areas.
- Loftier voltage (HV; subtransmission less than 100 kV; subtransmission or manual at voltages such every bit 115 kV and 138 kV), used for sub-transmission and transmission of bulk quantities of electrical power and connectedness to very big consumers.
- Extra high voltage (EHV; manual) – over 230 kV, up to about 800 kV, used for long distance, very high power manual.
- Ultra loftier voltage (UHV) – higher than 800 kV.
How to identify voltage level of a powerline
The voltage level can be recognized past the length of the insulator string and the number of insulator elements.
| Voltage level of a manual line | Length of insulator string | Number of insulator discs |
|---|---|---|
| | | |
| | | |
| | | |
Safe utilise of machinery shut past powerline
When working shut to electrical powerlines we have to exercise caution not to work too close to the live stage conductors. No machinery must be brought into the tower expanse. Never bulldoze machinery between the tower legs, nether a guy wire, or closer than iii metres from the tower structures.
The minimum clearance distances o powerline are as specified:
| Voltage (kV) | Minimum Clearance Distance (ft) |
| Up to l | 10 |
| >fifty to 200 | xv |
| >200 to 350 | 20 |
| >350 to 500 | 25* |
| >500 to 750 | 35* |
| >750 to 1,000 | 45* |
| >ane,000 | adamant by the utility/possessor |
HSE Executive has also given a guideline on electrical condom at work and working safely under electrical ability lines.
Also run into Guidance on Overhead power line Pdf
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To work safely effectually powerlines, y'all take to be conversant with the voltage levels of the dissimilar powerlines and the safe clearance level stipulated for each.
Never be careless around overhead power-lines since the hazard involve are so severe, ranging from severe shock, burns, electrocution, fire, etc.
What Is The Normal Voltage Range For Residential Power Services,
Source: https://hsewatch.com/powerline
Posted by: palmerwhinsise1961.blogspot.com
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