On a remote site the scarce thing is a licensed pair of hands. The material is on the truck, the set is in the trailer, the pad is poured and the heaters are running. What it does not have is an electrician who can stay long enough to terminate every conductor in the plant and then stand beside it while it is commissioned. Every hour of that work costs a seat on a plane, a bed in a camp and a rotation booked before the ground thawed, and the hour that goes wrong costs a second flight.
A package that arrives pre-wired, labelled and tested moves that work off the site and into a shop, where the labour is on the floor every morning, the drawing is on the bench, the weather is indoors and a mistake costs a walk to the stores. On the site the same mistake costs a truck. This line builds the packages that make that exchange: skids, modular assemblies, pre-terminated enclosures and the interconnect between them, built so that the site's only job is to land what arrives. What we make places the line beside the other three.
The seam is the landing
Everything inside a skid or an enclosure was built in the shop with the drawing in hand. Whoever terminated the motor leads could see the schematic and walk to the far end of the cable to check. Everything outside the skid was built by the site to the site's own set: the feeder, the ground grid, the conduit stubs through the pad, the transmitters in the site's own tanks, the fibre from the control building. It was built by people who have since gone home.
The seam is the terminal strip or the interconnect plug where those two sets of intentions meet, and nobody is standing there to reconcile them. The site's set was drawn by one engineer and built by one crew; the package's set by another, in a shop the site crew never saw. Both show the same terminal, and each assumes the other will honour it. Where they agree, the landing is a connection made from a list, with a torque screwdriver. Where they disagree, the disagreement is found in the field, with one set in hand and the people who built to the other unreachable.
That problem is solved on paper before it is solved in copper. A package is built from the issued set, and the seam on the package's drawings is reconciled against the seam on the site's drawings, terminal by terminal, before the first conductor is cut. The seam describes how the shop treats every seam it builds; the one at the landing is the only one whose far side was built by somebody who is not coming back.
The topology of a landed package
A landed package has five parts. Power comes in at one place. The site brings a feeder, sized and protected by the site's engineer to the site's single-line diagram, and lands it on the package's main disconnect. The disconnect is the package's; the feeder is the site's. Each drawing shows the landing from its own side, and the two must agree on the conductor count, the ground and the neutral before the feeder is pulled, because a feeder pulled through a duct bank that has since been backfilled is a feeder nobody is going to pull again.
Distribution lives inside the skid. The panelboard, the motor control, the drives, the control transformer and every branch circuit on the skid are built and terminated at both ends in the shop. Nothing in the distribution crosses the seam. It is where the shop's discipline shows most: every conductor carries its circuit identity, end to end, so that a person opening the panel by headlamp can read a wire and find it on the drawing. Labelling and traceability is where that identity comes from.
Control crosses the seam most often, and in both directions. The controller, its inputs and outputs, the local control station, the emergency stop chain and every instrument bolted to the skid are wired to the control panel in the shop. The instruments the site owns land at the control terminal strip, and so does the link back to the site's control building. Each of those landings is a terminal on the package drawing with its purpose written beside it. The emergency stop chain is the sharpest case. Safety circuits never share a bundle, a splice or a shell with power, and where the site's own stop station must break the package's chain, the drawing shows exactly which terminals open the chain and which are never to be used for anything else. Segregation describes how the chain is kept apart inside the package.
Most plant is more than one package. A power skid feeds a process skid; a control building talks to a pump house. The cables between them are the interconnect, and they are the cables most often left to the site, because they belong to nobody's skid. This line builds them. Each is cut to a length that was walked or scaled from a drawing that carries the survey, terminated at one end with the far end prepared and labelled, or terminated at both ends with a plug where the packages are close enough to be connected rather than landed. Connectors describes what a plug at a seam has to do. The interconnect has its own sheet, and the sheet shows both ends.
The site's own landings are everything the package needs that it does not bring: the feeder, the ground grid, the conduit stubs, the field instruments off the skid, the backhaul. The site builds them to the site's set. The package draws each as a terminal and promises that the terminal is there, that it is labelled as drawn, and that it is connected to what the drawing says and to nothing else.
Nothing is fabricated until the drawing is signed.
What the joints have to survive
Between the shop door and the pad a package goes through more than most plant sees in its working life, and the joints are what survive it. Winter is the first. A package built in a warm shop is landed on a day the site chose, and it may be the coldest of the year. Jackets that bent easily on the bench go stiff in the cold, and a conductor bent cold at a fixed end cracks where nobody can see it. Metal shrinks as it cools, and a termination that was merely tight on a warm bench has let go by the time the box is cold, So it is torqued and recorded, never felt. The shop builds for the day the door is opened: strain relief at every fixed end, bend radii drawn and held, jackets chosen for the site's temperature rather than the shop's, heaters and breathers where the enclosure needs them.
Wash-down is the second. A skid in a process plant is hosed. A skid in a food plant is hosed with something that eats aluminium. The enclosure rating on the drawing says what the enclosure keeps out; the glands, the seals, the conduit entries and the drain say whether it does. A gland is a joint. A conduit seal is a joint. The shop makes every entry from the underside where the drawing allows it, seals every entry to the rating on the drawing, and leaves the enclosure a way to let its own moisture out, because an enclosure that keeps water out and holds its own condensation in fails from the inside.
A crane is the third. A skid is lifted at its lifting points and flexes between them. A control panel bolted to the frame does not flex; the tray between the panel and the motor does. Every run is tied to the structure it will move with, not to the equipment it will move relative to, and every run that crosses from frame to equipment has slack and a fixed end on each side. If the rigging plan is not on the set, the shop asks for it before the cable is dressed, because a package dressed for a lift it never sees is dressed wrong for the one it gets. Routing is where the dressing rules live.
A truck is the fourth. The road works a termination harder than the plant it is going to. Screws back out. Ferrules crimped by hand instead of by the tool walk out of their terminals. A loose conductor arrives looking tight and fails when the load comes on. The shop crimps with the tool the ferrule was made for, torques to the value on the drawing with a tool that records it, and ships the record of both, so that on landing the site checks the terminations against the record rather than against a feeling.
A thaw is the fifth. The pad moves with the ground under it. A conduit stub that came up through the pad in one place in the fall comes up somewhere slightly different in the spring, and the enclosure it enters has not moved with it. Water that ran into a conduit in the fall froze there and split what it was in. The seam has to allow for ground that moves: expansion fittings where the conduit enters, drains at the low points, and a cable entry that takes the movement without passing it to the termination inside. The site builds the stubs. The package draws the entries. Both have to expect the ground to move, and the drawing is where they agree on how much.
What the package promises the site
The package makes three promises to the site, and it makes them on the drawing rather than in a conversation. The first is which terminals take power in. The main landing is drawn, labelled on the strip exactly as it is drawn, and connected downstream to what the drawing says, so the site's electrician lands the feeder without opening a schematic.
The second is which terminals present signals out and accept signals in. Every point on the control strip carries a tag that matches the site's loop drawings and the package's schematic, and the conductor carries the same tag at both ends. A signal common is landed where the drawing shows a common and nowhere else. A shield is grounded at the end the drawing shows, and at the other end it is cut back and insulated inside the tail, so there is nothing for the site to land and the shield is grounded once. Shielding and bonding explains what a second ground costs and when the drawing calls for one anyway.
The third is that a terminal not on the drawing is connected to nothing. Spare terminals are spare. Spare conductors are landed on a spare strip or capped, labelled as spare either way, and never borrowed for something that was forgotten. There are no jumpers that are not drawn. A site electrician who finds an unlabelled conductor on a landed package has found a mistake, and the record says whose.
A promise made on a drawing is only as good as the revision it is made on. Sites change: a feeder is rerouted, a transmitter moves, a second tank is added. The seam is where a change on either side arrives, and it arrives silently if nobody sends it. The shop builds to the issued revision of the site's interconnection drawing, states that revision on the package's own drawing, and stops when the site issues a new one. A change that reaches the shop before the wire is cut is a drawing change. The same change arriving after the package has shipped is a truck roll.
How a bad landing presents, and who pays
Anyone who has set a pre-hung door into a rough opening framed to a different drawing already owns the landing. The door is square. The frame is square. The opening is whatever somebody actually framed, months earlier, and none of the crew who framed it is still on site. A landed package has one such opening for every circuit that crosses the seam, and the licensed hands that could shim it are a plane ride away.
A bad landing presents on commissioning day, because that is the first day anything is asked to work. The feeder is landed and the main breaker closes. A drive faults. A motor turns backward. A level reads nothing because the site's transmitter landed on the package's common instead of its signal terminal. The emergency stop chain will not reset because the site's stop station landed on a pair the package's drawing shows as spare, and spare is open. None of these is hard to fix. Each is a conductor moved from one terminal to the one beside it. What is hard is that the person who may legally move it is not there.
The truck roll is the dearest unit in the trade. It is a licensed electrician, a truck, a day of travel each way, a camp bed, a standby crew waiting on the fix, a commissioning technician whose flight home is booked, and the last of the schedule float, all spent on a jumper. In principle, whoever's set was wrong pays. In practice everyone pays: the owner pays standby, the contractor pays the rework, the package builder pays the flight, and the argument about who pays costs more than the fix. The way not to pay is to reconcile the seam before the package ships, terminal by terminal, against both sets, and to ship the record that shows it was done. Then the landing is the connection from a list it was meant to be, and the truck stays parked.
How a package is bought
A package is bought from the issued set. Nothing is fabricated until the drawing is signed. The shop takes the issued drawings for the package and the issued interconnection drawings for the site, performs the takeoff, sources the material to the specification on the drawings and builds to them. Where the set is silent, the shop asks before it cuts, and the answer goes onto the drawing, because the drawing is all the site will have when the shop is not there. How it is built walks the sequence from takeoff to crate.
The components we specify carry their own certification. The approval route for a finished, project-specific assembly is confirmed with the certifying body for that assembly before it is built, and we tell you where yours sits before we build it, not after. CSA and the Canadian Electrical Code govern, and the route for a given package depends on what it is, where it is going and who will inspect it there, all of which is known from the set. CSA and the Code carries the position in full.
Every package is tested before it leaves. A continuity test asks whether every conductor goes where the drawing says. An isolation test asks whether two circuits that must never meet are in fact separate. A function test asks whether the package does what its sequence says when its inputs are exercised at the strip. The values those tests are set to belong to the engineer responsible for the assembly and to that assembly's own specification; what the tests prove is the same on every package. Test and acceptance describes each one.
The package ships with its record: the as-built set, the takeoff, the material certificates, the crimp and torque record, the test record and the label schedule. It is the thing the site opens first, and the record is what a package is worth after the shop has gone home. How to engage says what to send with the first enquiry.
The harnesses in this line
The remote site package is power and control for a site with no licensed hands on it, wired, labelled and tested before it ships. It is the electrical scope of a small site in one package: the incoming landing, the distribution, the control panel, the heat and light that keep the site alive through a winter, and every terminal the site will land on, drawn on one sheet.
Skid and modular assemblies is plant built on a skid in the shop, with every internal run terminated and every external landing drawn. The skid is the frame, the equipment on it and every conductor between, dressed for the lift and the road, with the seam on a sheet of its own.
Pre-terminated enclosures and interconnect is enclosures that arrive with the terminations made and the interconnect cut to a walked length. The cables that leave it are cut, terminated at the enclosure end and prepared at the far end, so that the site pulls and lands and does not strip and crimp in the cold.
Plant power and control is line-voltage distribution and the controls that go with it, built to the issued set and the Canadian Electrical Code. It is the electrical trade's scope, drawn as the electrical trade draws it, and it stops where the drawing says the mechanical trade's controls begin.
Site interconnect and the landed kit is the cables between packages and the kit that lands them, so that the site's only job is to connect. The kit is the glands, lugs, ferrules, labels and fasteners each landing needs, counted from the drawing and bagged by landing, so that nobody goes looking for a gland in a stores trailer at the end of a gravel road.
What this line refuses
We do not quote low-voltage control scope without an explicit agreement. On most industrial drawing sets, low-voltage controls and their wiring are the mechanical trade's scope, and line-voltage power and controls are the electrical trade's. A building-automation harness or an instrumentation loom sits on the mechanical side of that line unless the set or the contract puts it somewhere else. We say so at the first enquiry rather than at the first invoice, because a controls harness quoted into the wrong trade's package is a harness nobody has drawn.
We do not build an assembly ahead of its approval route. The route is settled from the set before material is ordered, and a package built first and routed afterwards may not be permitted to be energized where it is going. Finding that out on the pad, with the inspector standing beside it, is the most expensive way to learn what the drawing already knew.
We do not cut a length nobody measured. A value nobody measured never reaches a wire. An interconnect cable is cut to a length that was walked, surveyed or scaled from a drawing that carries the survey, and a length that was guessed is not cut. A cable that arrives short is a truck roll. A cable that arrives long is a coil of copper in a cold enclosure that nobody will ever dress properly.
We do not ship a package without its record. The as-built set, the test record, the crimp and torque record and the label schedule ship with the package or the package does not ship. A package that arrives without its record is a box of conductors the site will have to trace, and tracing is the work the package was bought to remove.
