Power Drop
A power drop is the work of bringing usable electrical supply from an existing circuit or panel to a new device location. On an RTLS project that usually means feeding a ceiling anchor, gateway, or PoE switch in a place that was never designed for that load. The unit price of the hardware does not include the drop. The plant bill does.
In a running factory the drop is rarely a short plug. Cable trays are full. Fire compartments limit where you can open a chase. Production may forbid daytime work over live aisles, so the electrician and the lift share a night or weekend window. Each drop you skip by moving the anchor also moves the radio cell, which can open a coverage hole. That trade-off is central to hardware is the small part, the building sets the bill.
PoE can reduce separate mains at the device, but it still needs a switch port, a cable run, and often a midspan or powered switch in a closet that already owns the LAN budget. Put power drops on the same sheet as tags when you estimate total cost of ownership.
Key Components
Source circuit: Panel, spare breaker capacity, or PoE switch with budget for the new load.
Path: Tray, conduit, or approved free-air route that meets plant and fire rules without blocking crane travel or sprinkler clearance.
Termination: Outlet, junction, or PoE jack at the mount, plus labeling so maintenance can find it later.
Access window: Lift, permit, and off-shift labour when the aisle cannot stop for daytime work at height.
Applications in Manufacturing and Logistics
RTLS grids, fixed cameras, and IoT gateways all inherit the same drop problem in brownfield halls. Logistics teams feel it when the cheapest radio still needs twenty powered nodes over the forklift loop. Facilities feels it when every new SKU on the roof fights for tray space with existing lighting and controls.
A honest design either budgets the drops, uses battery where the job allows, or densifies only the pockets that fail the coverage map. Spreading powered anchors everywhere because the datasheet looked neat is how install cost overtakes hardware cost.
Benefits and Challenges
Planning drops early keeps the mount plan honest and stops late change orders when the ceiling walk finds no spare circuit. It also forces the accuracy conversation: if power cannot reach the ideal point, the job may need a different radio or a coarser zone.
The challenge is schedule. Electricians, lift rental, and production windows rarely align with a vendor's demo calendar. A quote without those lines is incomplete, not cheap.
Related Terms
Power drops feed RTLS anchors and related fixed nodes. They sit inside TCO and the install checklist in hidden costs of RTLS technologies. Coverage after the final mounts is proven with a coverage map.
Frequently Asked Questions
Is PoE free of power-drop cost? No. PoE moves the supply to a switch, but you still pay for cable, ports, and often closet upgrades. The lift to pull cable at height remains.
Can battery anchors avoid drops? Sometimes for sparse BLE reference points. Dense UWB grids and many gateways still expect hard power or frequent battery service, which is another OpEx line.
Who owns the drop on site? Usually facilities or plant electrical, not the RTLS vendor alone. Align them before the mount plan is frozen.
How many drops should a first quote assume? Count planned powered nodes, then add contingency for mounts that move after the ceiling walk. Do not assume every drawing point already has a spare outlet.