If you’ve spent any time scoping an industrial project, you’ve probably run into the term I&E — short for Instrumentation & Electrical. It shows up in bid packages, org charts, and scopes of work, but a lot of project owners aren’t entirely sure where I&E starts and stops, or why it deserves its own line item separate from “construction” in general.
Here’s the short version: I&E is the work that turns a plant full of steel, pipe, and concrete into a plant that actually runs. Everything else — the vessels, the piping, the structural steel — is the body. I&E is the nervous system.
What “I&E” Actually Means
Instrumentation covers the devices that measure and control your process: pressure transmitters, flow meters, temperature elements, level switches, control valves, and the analyzers that keep a process within spec. These are the sensors and final control elements that tell you — and your control system — what’s actually happening inside a pipe or vessel at any given moment.
Electrical covers everything that delivers and manages power: switchgear, transformers, motor control centers, grounding systems, lighting, cable tray, conduit, and the miles of wire that connect it all. Without it, none of your instruments, motors, or control systems have anywhere to draw power from.
An I&E construction company installs, terminates, tests, and commissions both disciplines together, because in the field they’re deeply intertwined. A single instrument loop — say, a pressure transmitter feeding a control valve — depends on electrical infrastructure to power the transmitter, signal cable to carry the reading, and a properly grounded system to keep the reading accurate. Split those scopes across two contractors and you’ve split accountability for the one system that has to work perfectly, every time, for the plant to run safely.
What the Work Looks Like in the Field
On a typical industrial project, I&E scope includes:
- Instrument installation — mounting and hooking up transmitters, gauges, switches, and analyzers per the instrument index and P&IDs
- Loop checks and calibration — verifying that what a device reports in the control room matches what’s actually happening at the tap
- Conduit and cable tray installation — routing the physical pathways that protect signal and power cable through the unit
- Cable pulling and termination — running and landing thousands of individual conductors correctly, often across a site with tens of thousands of terminations
- Motor control centers and switchgear — installing and wiring the equipment that distributes and controls power to pumps, compressors, and fans
- Control system tie-ins — connecting field devices back to the DCS, PLC, or SIS so the control room has an accurate, real-time picture of the process
- Hazardous area compliance — installing everything to the correct Class/Division or Zone rating, since most industrial sites have areas where a stray spark isn’t an option
- Loop and system commissioning — proving out each instrument loop and electrical system before it’s turned over for startup
None of this is generic construction labor. It requires electricians and instrument technicians who can read a P&ID and a loop diagram as fluently as a foreman reads an isometric, and who understand the consequences of a miswired loop on a live process unit.
Why I&E Is Often the Long Pole in the Schedule
I&E is typically one of the last disciplines to finish before startup — and one of the easiest to underestimate. A plant can look mechanically complete with all the steel set and pipe welded, and still be months from producing anything if the instrument loops aren’t proven out and the electrical systems aren’t fully energized and tested.
It’s also where design intent meets physical reality. Cable routing conflicts, instrument tap locations that don’t match the field, and last-minute control system changes tend to surface during I&E construction, because that’s when every other discipline’s work finally gets connected into one functioning system. An I&E team with real field experience catches these issues early and resolves them without derailing the schedule; a team that’s only ever worked from a drawing tends to find out the hard way.
Why Some Owners Hire I&E as Its Own Scope
Because I&E is specialized, some project owners break it out as a standalone contract, separate from civil, structural, or piping. That can work well when the scope is contained and the interfaces with other disciplines are clearly defined.
But on process-heavy projects — refineries, chemical plants, LNG facilities, pipelines — I&E rarely stands alone. It touches every other discipline on the job, and a poor handoff between contractors (whose steel, whose grounding grid, whose conduit stub-ups) is one of the more common sources of rework and schedule slip on multi-contractor jobs.
That’s a big part of why owners increasingly look for a single EPC partner who can carry I&E alongside the rest of construction — engineering, procurement, civil, mechanical, and fabrication — under one contract and one point of accountability. When the same company that ran conduit also poured the foundations and fabricated the pipe spools, there’s no finger-pointing over whose scope a conflict falls into. There’s just one team, fixing it.
How Burrow Global Approaches I&E
At Burrow Global, I&E construction is delivered as part of our integrated EPC++ model — engineering, procurement, and construction, plus the fabrication, automation, and controls capability that most EPC firms subcontract out. Our instrumentation and electrical crews work alongside our civil, mechanical, and automation teams from day one, so loop drawings, conduit routing, and control system tie-ins are coordinated long before construction starts, not reconciled after the fact.
That approach is built around our home base on the Texas and Louisiana Gulf Coast, where we’ve executed I&E scopes for oil and gas, chemical, and LNG facilities that depend on getting instrumentation and power right the first time — because in those industries, a bad loop isn’t just a rework ticket, it’s a safety issue.
Talk to Our I&E Team
If you’re scoping instrumentation and electrical work for an upcoming project — or trying to decide whether it should be its own contract or part of a single-source EPC scope — we’re glad to walk through it with you.