Note
Staffing for a Window You Do Not Control
Most electrical installation schedules are built as if the contractor decides when the work starts. For factory installations, that is rarely true.
When you are running a solar installation on a factory roof, a full LED retrofit inside a production hall, or a panel upgrade feeding a production line, you need the factory to stop something first. The machine needs to go cold, the section needs to clear, and none of that happens on your timeline. It happens on the factory’s.
The result is a category of committed work that sits in a waiting state: jobs you have accepted, quoted, and prepared for, that cannot be started until a date the customer controls. Managing that category well is one of the things that separates a contractor who handles busy periods smoothly from one who scrambles every time a window opens.
What is a factory shutdown window?
A factory shutdown window is a defined period when production stops or reduces enough to allow electrical installation work that would otherwise be impossible. The scope and timing of the window depend entirely on the factory.
Some windows are predictable. Thai factories typically plan full maintenance stops around Songkran (April), the end of the calendar year, and Chinese New Year for businesses with Chinese ownership. These are known months in advance. If a job depends on one of these windows, you can plan for it.
Other windows are not predictable. A production line breaks down and the repair gives you three days on a section that would normally take three months to access. Or a customer calls on Tuesday with a Saturday and Sunday window starting in four days.
Both types create the same operational question: when the window opens, are you ready to walk on site and start work?
Why does waiting for a window create a scheduling problem?
The waiting period is where planning tends to drift. The job is accepted, the quote is signed, and the materials are (in theory) ordered. But because there is no confirmed start date, the preparation often stays half-finished.
Then the window is confirmed. It is in ten days. Suddenly you are checking whether the materials arrived, whether the site lead is free, whether the crew that quoted this job is now committed elsewhere. If another job’s window opens at the same time, you are making the same checks in parallel for two jobs at once.
The problem is not that windows are unpredictable. The problem is that the preparation required before a window is treated as something to do once the window is confirmed, rather than something to finish while the window is still a future date.
The pile-up: when several windows open at once
Consider a contractor with three jobs waiting on factory windows, all confirmed in the same week:
- Job A: a rooftop solar installation requiring a five-technician team. The factory’s annual maintenance week is October 12 to 18. Confirmed two months ago.
- Job B: an LED retrofit across three production sections. The factory is offering a Saturday and Sunday window. Confirmed on Thursday.
- Job C: a panel upgrade tied to a planned production line stop. The window was estimated for “mid-October” and confirmed on Monday as October 15 to 17.
Available crew: 12 technicians. Job A needs 5. Job B needs 4. Job C needs 3. Mathematically it fits.
But Job C shares dates with Job A, and if any technician is on leave or committed to a close-out visit from last month, the numbers change. And if Job B’s materials have not arrived, a four-technician team at the gate waiting for cable drums is four technicians available for nothing else.
This is manageable if the information exists before Thursday. It is a scramble if Thursday is when the checking begins.
What you need on record for each waiting job
For every job that is committed but waiting on a factory window, you need four things on record before the window is confirmed:
- Estimated window dates: even an approximate range helps. “October” is better than nothing. “October, the factory’s annual maintenance week” is better still.
- Team requirement: how many technicians and which skills. A rooftop solar job and a lighting retrofit need different experience levels, and the same technician cannot be in both places.
- Materials status: ordered, in transit, on site, or still to be purchased. A window that opens before the materials arrive is not a usable window.
- Site lead assigned: who is responsible for the site from day one. This is not a decision to make the morning the window opens.
Without these four things on record, a confirmed window triggers checking that should have been done weeks earlier. The window does not give you time to prepare. It only confirms that the time has run out.
How visibility ahead of the window changes the outcome
A board showing the whole month staffed by technician-days gives you a picture of where your crew is committed before any given window arrives.
When Job A’s factory confirms October 12, you check the board and see the five technicians unassigned that week. When Job C confirms October 15 (three days overlap), you can see whether any of those five are needed for Job C and whether three others are free to cover it. You answer based on what you know, not what you hope.
The same applies to materials. A materials status field means confirming “on site” takes two seconds. Without it, that confirmation takes a phone call, then another, then a message unanswered until evening.
Preparation does not happen the morning the window opens. It happens in the week before, when there is still time to fix the gaps.
FAQ
What if the factory gives 24 hours’ notice?
Short-notice windows happen, especially when a production line develops an unexpected fault. When the four things above are already recorded, a 24-hour notice is workable: you know within 30 minutes whether you can mobilise. Without that record, the 24 hours is mostly spent finding out whether you are ready.
What do you do when the window is shorter than expected?
The factory offered five days. On day two, production restarts early. The useful question to answer before the window is which scope is critical on day one, and which can be deferred. That conversation belongs between the project manager and the customer, not between the site lead and the factory floor supervisor at 7:00 on the first morning.
How do you handle two factories whose windows always overlap?
Some factories in the same industrial estate run maintenance windows on the same calendar. If this pattern repeats across jobs, the real options are holding a team in reserve for those windows, or being direct with one customer that capacity in that window is limited. Neither conversation is comfortable, and both are easier before you have accepted both jobs.
If you want to see how a month board and waiting job records work in practice, the TRACE 30 program page walks through what the install puts in place, including how future-dated job orders and the technician-day board work together.