Wire Prepping SOP

This procedure defines when Blitzpanel pre-cuts, strips, ferrules, and labels wire in Wire Prep versus building a job point-to-point (live) at the panel, and how prepared wire is bundled and handed off to the build.

It exists so the wiring method is a deliberate, documented decision rather than an ad-hoc habit, keeping batch prep efficient on repeat work and avoiding wasted pre-prep effort on unstable or one-off designs.

A disciplined wire-prep decision protects labor efficiency, keeps wire-to-schematic traceability intact for UL508A documentation, and prevents mismatched or missing wire at the point of build.

Applies to all released panel jobs moving from the cut list into wire preparation, covering the pre-prep vs. point-to-point decision, ferrule/termination prep standards, and bundling/labeling of prepared wire.

Covers the handoff of labeled bundles (or, for point-to-point jobs, released wire stock and schematic) from Wire Prep to the panel wirer/assembler or to Kitting.

Does not cover generation of the cut list itself (see Cut List SOP) or staging of prepared wire into job kits alongside other components (see Kitting SOP).

Pre-cut / pre-prepped wire — wire cut to length, stripped, ferruled (where required), and labeled in Wire Prep before it reaches the panel for installation.

Point-to-point (live) wiring — wire cut, stripped, terminated, and labeled directly at the panel or bench as it is installed, with no preceding Wire Prep batch step.

Ferrule — a metal sleeve crimped onto a stranded wire end to prevent strand splay and provide a solid bearing surface under a compression-style terminal.

Wire bundle — a group of individually cut, stripped, and labeled wires grouped and secured together for handling as a single unit.

Labeled bundle — a wire bundle carrying a tag identifying job number, unit number, destination, and wire count, ready for kitting pick or direct panel handoff.

Strip length — the length of insulation removed from a wire end, sized to the termination type (ferrule, ring lug, direct clamp) being used.

Role	Responsibility
Production Planner / Scheduler	Decides pre-prep vs. point-to-point per job against the criteria in §6.1 and records the decision on the job traveler. TODO: confirm the role/title that owns this decision.
Wire Prep Technician	Executes pre-cut/strip/ferrule/label prep, bundles and labels wire, and stages it per the cut list.
Panel Wirer / Assembler	Builds point-to-point jobs live at the panel; installs pre-prepped bundles when supplied; confirms handoff counts.
Design / Engineering	Provides the released schematic, wire numbers, and cut list; resolves routing or termination ambiguities flagged during prep or live build.
Quality	Verifies ferrule crimp quality, label accuracy, and bundle-to-cut-list agreement on sampled batches before release to build.

Wire prep station with cutting/stripping equipment, plus ferrule crimping tool(s) with sized dies per conductor gauge and a crimp-quality check gauge. TODO: name/model of the current wire prep machine(s) and confirm crimper calibration/verification schedule.

Wire label printer and heat-shrink or slide-on wire marker stock. TODO: confirm label printer model and marker stock.

The released cut list (see Cut List SOP) as the prep input; wire and label stock per the Approved Vendor List SOP.

Bundling materials — lacing cord, hook-and-loop strap, split-loom sleeving — and job/unit-labeled staging bins or carts. TODO: confirm the approved bundling material list and bin/cart labeling convention.

6.1 Decision criteria — pre-prep vs. point-to-point

Default to pre-cut/strip/ferrule/label prep when the released cut list is stable (schematic/BOM revision locked) and the job meets the minimum quantity or wire-count threshold for batch efficiency. TODO: define the quantity/wire-count threshold (e.g., ≥3 identical units or ≥N wire runs).

Default to point-to-point (live) wiring for prototype or one-off builds, designs with active or expected engineering changes, low wire count, or expedite/rush jobs where prep staging time exceeds its benefit.

Weigh current Wire Prep machine/technician capacity against panel wirer availability when timing a pre-prep batch; do not pre-prep a job the floor cannot install within a reasonable window, since prepped bundles awaiting install are a hidden work-in-process cost.

Record the method decision (and any exception to the default rule, with reason) on the job traveler/router before work begins, so Wire Prep, the panel wirer, and Quality all expect the same workflow.

6.2 Pre-prep workflow

Pull the released cut list and confirm its revision matches the current schematic/BOM before cutting; stop and escalate to Design/Engineering on any mismatch.

Cut each wire run to its specified length, strip both ends to the standard strip length for the termination type, crimp ferrules where called for (see §6.4), and apply the wire number label at each end.

Batch by job and, for multi-unit runs, by unit number; do not mix wire from different units in the same bundle or bin.

Pull a sample from each completed batch and check gauge/color against the cut list, ferrule crimp quality, and label legibility/accuracy before bundling and staging.

6.3 Point-to-point (live) workflow

Pull bulk wire stock/spools and the released schematic and wire number list directly to the bench or panel; no cut list batch is generated for this job.

Cut, strip, terminate, and label each wire in place as it is installed, following the schematic routing, and verify fit and dress before crimping or torquing the termination.

Apply the wire number label at the time of installation, matching the schematic exactly; do not defer labeling to a later pass through the panel.

Flag any schematic ambiguity, routing conflict, or missing wire number to Design/Engineering immediately rather than guessing — point-to-point work has no pre-generated cut list to catch the error later.

6.4 Ferrule and termination standards

Apply ferrules to stranded conductors terminating at compression-style terminal blocks or devices, per the device manufacturer's termination requirements and Blitzpanel's ferrule standard. TODO: verify exact UL508A/NEC termination clause before citing.

Match ferrule size to conductor gauge, use the shop's standard insulated color-coded ferrule by gauge, and do not exceed the terminal/device manufacturer's rated number of conductors per point. TODO: define the ferrule color-code-by-gauge standard and verify the conductors-per-terminal clause before citing.

Torque every termination to the device manufacturer's spec sheet value or the Blitzpanel torque standard where the device does not specify one. TODO: attach/confirm the shop torque reference table.

6.5 Bundling, labeling, and staging

Group prepared wires into bundles by destination (device, subpanel, terminal strip) using lacing cord, hook-and-loop strap, or split-loom sleeve appropriate to the run length, and attach a bundle tag with job number, unit number, destination, and wire count before it leaves the bench. TODO: define fastener spacing/interval standard.

Stage labeled bundles in job-designated bins or carts, segregated by unit on multi-unit runs, ready for Kitting pick or direct handoff to the panel wirer.

Reconcile completed bundle count and wire count against the cut list to confirm no wire run is short or missing before staging is marked complete.

6.6 Handoff to build

Hand off labeled bundles (or, for point-to-point jobs, released wire stock and the schematic/wire number list) to the panel wirer/assembler together with the job traveler.

Have the receiving wirer confirm bundle count and labels against the cut list (or schematic, for point-to-point) at handoff; log any discrepancy back to Wire Prep before build starts.

Update the job/production status system to show wire prep complete and the job ready for build. TODO: name the system of record for job/production status.

The cut list used for the batch (revision-matched to the schematic/BOM) or, for point-to-point jobs, the schematic revision referenced.

The wire-prep method decision recorded on the job traveler, including the reason for any exception to the default criteria in §6.1.

Sample QC check results (crimp quality, gauge/color, label accuracy) for pre-prepped batches, and any handoff discrepancy logged between Wire Prep and the panel wirer/Kitting. TODO: set retention policy for wire-prep records.

Cut List SOP, Kitting SOP, Engineering Release SOP, Approved Vendor List SOP.

UL508A — Standard for Industrial Control Panels (wire marking, termination, and ferrule/torque basis). TODO: verify exact clause references before citing.

NEC / NFPA 79 — conductor termination and wireway/duct fill basis. TODO: verify exact clause references before citing.

Back to document index