Electrical vs Fire Alarm vs Controls: Who Owns Conduit, Power, Interlocks, and Startup on a Commercial Bid?

Key takeaways

• Division 26 usually owns branch power and line-voltage raceway unless the documents clearly assign that work elsewhere.
• Fire alarm and HVAC controls usually own their own devices, low-voltage cabling, programming, and system checkout.
• Interlocks, duct detectors, and startup responsibilities should be assigned device by device before award.
• Electrified openings need written coordination between hardware, security, electrical, and fire alarm scopes.
• A written leveling sheet is the strongest defense against post-award scope-gap disputes.

On most commercial bids, Division 26 carries branch power, line-voltage raceway, grounding, disconnects, and electrical terminations. Fire alarm usually carries fire alarm devices, modules, programming, and testing, while HVAC controls usually carries controls devices, control wiring, relays, point checkout, and startup for its own system.

Conduit, interlocks, duct detectors, electrified openings, and rough-in still need written clarifications before award because those items often cross package boundaries.

Tribuild Consultancy is a multi-trade estimating, preconstruction, and project-administration company.

This issue affects bid leveling, buyout, submittals, procurement, startup, and change documentation.

Default the split by system ownership and voltage

The practical starting point is to assign scope by who owns the system and whether the work is line voltage or low voltage, then check that split against the drawings, specifications, addenda, and sequence notes.

A workable default looks like this:

• Division 26 electrical carries service, distribution, branch power, disconnects, grounding, line-voltage raceway, and electrical terminations to powered equipment.
• Division 28 fire alarm carries the fire alarm panel, devices, modules, programming, testing, and alarm-side interfaces shown in the life-safety documents.
• HVAC controls carries controls panels, low-voltage control wiring, relays, sensors, programming, point checkout, graphics if specified, and startup tied to the controls package.

That split is a starting point, not a substitute for scope review. A fire alarm monitor module on a riser, a control transformer in equipment literature, or a power supply shown in another division can shift ownership quickly.

Put branch power and line-voltage raceway under Division 26 unless the documents reassign it

If the documents are unclear, carrying branch power and line-voltage raceway in Division 26 is usually the cleaner estimating choice, while each system trade carries its own low-voltage cabling and device work.

Use that assumption carefully and write it down:

• Electrical carries branch circuits to fire alarm panels, BAS panels, access-control power supplies, door operators, dampers with line-voltage power, and similar equipment unless the documents assign that feed elsewhere.
• Electrical carries line-voltage conduit, wire, disconnects, grounding, and terminations for powered equipment.
• Fire alarm, controls, or security carries low-voltage system cabling, device terminations, programming, and testing within its own package.
• Low-voltage raceway should be assigned from the documents, not assumed. If the specifications place conduit, boxes, sleeves, and rough-in under electrical, carry them in Division 26.
• Underground, slab, and wall rough-in needs written ownership before concrete placement or close-in.

Do not leave related support items floating between trades. Housekeeping pads, trenching, bollards, sleeves, supports, and equipment bases need an assigned owner if they are required for the electrical or controls installation.

Assign interlocks and duct detectors device by device

Fan shutdowns, smoke dampers, elevator recall, magnetic hold-opens, and similar interfaces should be leveled device by device because the work usually touches more than one package.

A practical default is:

• Fire alarm contractor carries fire alarm devices, monitor modules, control modules, panel programming, testing, and alarm-side interface work shown on the life-safety documents.
• Mechanical controls contractor carries controls relays, controls logic, point wiring, equipment safeties within the BAS package, and startup or checkout for the mechanical control sequence.
• Electrical contractor carries power, line-voltage terminations, starters, disconnects, and electrical wiring to the controlled equipment.

Before bid, answer these questions for each interface:

• Who furnishes the detector, relay, module, or controller?
• Who pulls the low-voltage cable?
• Who provides conduit, boxes, sleeves, and rough-in?
• Who lands the line-voltage conductors at the equipment?
• Who programs the sequence?
• Who performs point-to-point checkout?
• Who attends integrated testing?

If the sequence of operations conflicts with the fire alarm riser, mechanical control diagram, or equipment schedule, issue an RFI. NFPA 72 and NFPA 90A provide system context, but the bid documents still need to assign the trade scope.

Treat electrified openings as coordinated multi-trade scope

Electrified doors are usually a coordinated scope split between hardware, security, electrical, and sometimes fire alarm.

A workable provisional split is:

• Division 08 door hardware supplier furnishes electrified hardware shown in the hardware schedule.
• Division 28 security or access control carries controllers, readers, request-to-exit devices, door position switches, low-voltage cabling, and system programming.
• Division 26 electrical carries branch power to power supplies, line-voltage raceway, and any rough-in conduit, boxes, or pathways assigned to electrical.
• Division 28 fire alarm, when shown, carries the alarm interface required to release hardware on alarm.
• General contractor coordination confirms frame prep, door handing, power-transfer requirements, and rough-in timing before release.

The same discipline applies to packaged equipment. Do not rely on broad phrases such as "complete and operational" when the equipment vendor, controls contractor, and electrical contractor all touch the same item. Level who furnishes the starter, who lands control wires, who lands power conductors, who provides interposing relays, and who starts up the system.

Issue an RFI when the documents split responsibility

Issue an RFI before bid when the documents leave a real trade-assignment question unresolved.

Common triggers include:

• The same device appears on mechanical, electrical, and fire alarm sheets with no clear scope note.
• The sequence calls for shutdown, release, alarm reporting, or status monitoring, but no relay, module, or termination detail is shown.
• Equipment requires power, but no branch circuit, disconnect, or panel connection is identified.
• The hardware schedule lists electrified openings, but the security or electrical sheets do not show pathway or head-end connections.
• A controls panel, packaged equipment controller, or vendor skid is specified, but startup or termination responsibility is unclear.
• Slab conduit, underground sleeves, housekeeping pads, roof supports, or wall blocking are required before close-in, but no trade is assigned.

If no answer is available before bid close, carry a stated provisional assumption in the estimate clarifications so the bid tab, buyout, and change review start from the same baseline.

Use one written scope note from bid leveling through buyout

The best clarification is a written scope note that names the device, power, pathway, cabling, terminations, programming, startup, and testing responsibility.

A useful structure is:

• Device or equipment: identify the exact item or location.
• Furnish: state who supplies it.
• Power: state who provides branch power, disconnect, and line-voltage terminations.
• Pathway: state who provides conduit, boxes, sleeves, supports, and rough-in.
• Cabling and terminations: state who pulls and lands low-voltage or control wiring.
• Programming and startup: state who performs point checkout, sequence programming, startup, and integrated testing attendance.

Sample bid-leveling notes:

• Electrical carries branch power, disconnects, grounding, line-voltage conduit, and wire to BAS panels, fire alarm power supplies, and access-control power supplies unless noted otherwise.
• HVAC controls carries BAS panels, controls cabling, relays, terminations, point checkout, programming, and startup for Division 23 controls scope.
• Fire alarm carries duct detectors, monitor and control modules, panel programming, testing, and fire alarm interlocks shown on the life-safety documents.
• Security or access control carries controllers, readers, door contacts, request-to-exit devices, low-voltage cabling, and system programming. Electrical carries branch power and any rough-in conduit assigned by the documents.
• Concrete or general trades, where applicable, carry housekeeping pads, blocking, sleeves, and supports shown or clarified for these systems.

The same clarification should follow the job from the bid tab to the subcontract scope letter, submittal responsibility matrix, procurement review, startup planning, and change log. Documents are prepared within the contractor's established review and approval workflow.

If you want to review one upcoming electrical, fire alarm, and controls interface before bids are finalized, Tribuild can help you build a clearer multi-trade leveling sheet.

Sources

• https://www.tribuildconsultancy.com
• https://www.nfpa.org/codes-and-standards/nfpa-72-standard-development/72
• https://www.nfpa.org/codes-and-standards/nfpa-90a-standard-development/90a