What is Service Drop?

Understanding Service Drop

Service Drop describes overhead conductors that carry electricity. They carry electricity from a utility distribution line to a building. The conductors normally extend from a utility pole to a building-mounted weatherhead. From there, they enter the service mast or raceway. They continue toward.electric meter and main service equipment.

Related glossary terms: National Electrical Code, Electrical Permit, Voltage Drop.

A service drop is part of the electrical service connection. It isn't a branch circuit inside the building. The utility generally owns or maintains the conductors and connection point. Ownership rules vary by utility and service agreement. The property owner usually becomes responsible at a defined point. This point may be the service attachment, meter socket, or service entrance conductors.

How Service Drop Works, Is Measured, or Is Used?

Utility power travels through the distribution system before reaching the service drop. At the pole, a transformer may reduce distribution voltage. It changes the voltage to the building's needed level. The service drop then carries the supply to the service entrance. The meter records energy use there. The main disconnect provides a way to shut off power.

Electricians and utilities assess a service drop by checking several features. They check conductor size, voltage, attachment height, span, condition, and connection points. The conductors must maintain required clearance from roofs, windows, walkways, driveways, and other structures. Exact clearances depend on the adopted electrical code and utility rules. They also depend on conductor arrangement and site conditions. A service drop may include separate ungrounded conductors and a grounded conductor. This grounded conductor is often called the neutral.

• Overhead conductors connect the pole or utility support to the building.
• The weatherhead keeps rain from following the conductors into the service raceway.
• The meter enclosure provides the utility metering point.
• The service equipment distributes power to interior circuits after the service connection.

Why Service Drop Matters?

A damaged service drop can affect the entire building. It supplies the main electrical service. Sagging wires may violate clearance rules. They may also come within reach of people, vehicles, ladders, or tree branches. Cracked insulation, corrosion, broken supports, and loose connections can cause arcing. They can also cause service interruptions or equipment damage.

Service drop work also involves a clear division of responsibility. A utility may need to disconnect, repair, or reconnect its conductors. An electrician can then safely replace a service mast, weatherhead, meter socket, or related equipment. Treating utility-owned conductors as ordinary building wiring can expose workers and occupants. They may contact energized parts.

When Service Drop Matters Most?

Service drop concerns often appear after storms, vehicle impacts, tree growth, roof work, or building changes. A new roof can damage a service mast. A remodel can leave the existing attachment too low. It may also fail to support the service conductors. A service upgrade may require a larger service entrance. It may also require a new meter arrangement or utility approval.

Look for visible sagging, damaged insulation, unusual sparking, burning odors, or a service mast pulling away from the wall. Don't touch the conductors, ladder, mast, or nearby metal parts if damage is present. Keep people away from the area. Report utility-side damage to the electric utility. An electrician can assess owner-controlled equipment after the utility makes the area safe. The electrician can also identify the service boundary.