Table of Contents
- 1 What are the two lines on a power pole?
- 2 What are the 3 lines on a power pole?
- 3 What is the difference between primary and secondary electrical service?
- 4 How do you know if a pole is 3 phase?
- 5 What is primary and secondary switchgear?
- 6 What is the difference between primary substation and secondary substation?
- 7 Do utility poles carry electricity or communications?
- 8 What kind of cables are used on telephone poles?
What are the two lines on a power pole?
Utility poles are commonly used to carry two types of electric power lines: distribution lines (or “feeders”) and subtransmission lines. Distribution lines carry power from local substations to customers.
What are the 3 lines on a power pole?
Utility poles consist of three distinct layers or spaces. The top layer is the supply space. The middle layer is the neutral space and the bottom layer is the communications space.
How do you read a utility pole brand?
How do I read a pole brand or tag? The top line is the manufacturing company, Bell Pole Company. The second line is the plant location, in this case New Brighton, and the year the pole was treated, 1998. WCPA is the species and treatment used on this pole.
What is the difference between primary and secondary power lines?
Primary lines, or primaries, are higher-voltage lines located at the top of utility poles, above transformers. Secondary lines, or secondaries, are located lower down on utility poles, usually below transformers. Typical secondary voltages are between 120 volts to 480 volts.
What is the difference between primary and secondary electrical service?
Distribution lines on the high voltage side of the distribution transformer are called primary distribution lines or primaries. Those on the low-voltage side of the distribution transformer are called secondary distribution lines or secondaries.
How do you know if a pole is 3 phase?
Look for 3 poles to identify a 3-phase power supply. Count the number of poles connected to the main switch in your switchboard. A 3-phase power supply has a switch that controls the flow of electricity through 3 circuits, so there are 3 poles.
What is on a power pole?
Primary wires are on top of the pole and usually carry 12,000 volts of electricity from a substation. Transformers convert higher voltage electricity carried by primary wires and lowers the voltage for use by customers. Guy wires help stabilize utility poles. A ground wire runs the entire length of the pole.
How are utility poles numbered?
NJUNS doesn’t keep track of the number a pole’s owner uses, said Tim Webers, the group’s executive director. Rather, it notes the physical address of a pole. Webers began his career in the 1980s at a power company that served the Midwest. He has seen many changes over the years.
What is primary and secondary switchgear?
Primary medium voltage switchgear represents an important part within the primary distribution substation functionality. The rated voltage, current and short circuit withstand ranges for secondary switchgears typically reach up to 36 kV, 1250 A and 50 kA respectively.
What is the difference between primary substation and secondary substation?
The primary substations are the interconnection between high voltage and medium voltage. The secondary substations are the interconnection between medium and low voltage.
What is the lowest wire on a utility pole?
Telephone and cable wires are typically the lowest wires. Transformers convert higher voltage electricity carried by primary wires and lowers the voltage for use by customers. Guy wires help stabilize utility poles. A ground wire runs the entire length of the pole. It directs any electricity on the pole safely into the earth.
Where does primary and secondary wiring live on power lines?
That’s where the primary and secondary wiring lives, along with all the safety and distribution equipment. Near the top of a typical pole you’ll often see one or more crossarms, which are stout wooden timbers bolted to the pole and braced diagonally. These act as spreaders to keep the wires of the primary circuits separated.
Do utility poles carry electricity or communications?
Normally a utility pole like the one shown carry both electricity and communications. The upper section of the pole is reserved for high-voltage electrical lines and the lower section houses low-voltage communications wires, like cable TV, phone, fiber optics, etc. At the top of some poles is a static wire.
What kind of cables are used on telephone poles?
These poles started life with either power cables—if an electrical utility owned them—or telephone cables—if a telco owned them. Over time, many more cables have been installed: copper phone cables, CATV coaxial, fiber for telcos and CATV, more fiber and maybe even more fiber.