Shop Drawings and Submittals (NFPA 72 Ch. 7, 10, 12, 17, 18, 21)

NFPA 72-2022 Ch. 7 · NFPA 72-2022 §1.5 · NFPA 72-2022 §10.3–10.6, §10.17 · NFPA 72-2022 Ch. 12, 17, 18, 21 · IBC-2021 §107 and §907.1 · NFPA 70-2020 §760 and §300.11 · Outline tasks 3.3.1

What NICET expects at Level III (task 3.3.1)

Domain 3.3, Submittal Preparation and System Layout, is worth 20 to 30 percent of the Level III exam and has one task: 3.3.1 Prepare and approve shop drawings. A Level III technician works independently, reads NFPA 72, the NEC, the IBC, and NFPA 101 together with the specifications, produces the submittal packet, and reviews other people's drawings before they go to the AHJ. Expect a small exhibit described in words (a schedule, a plan, a matrix row, a calculation sheet) and a question that asks you to spot the error, choose the compliant design, or decide what to send back. The answer is rarely one look-up: it is a look-up plus a judgment about who must approve what, and what you must not do on your own.

What a complete submittal contains

Document	What the reviewer checks	Source
Minimum documentation list	Written narrative, riser diagram, floor plans, sequence of operation, equipment data sheets, manufacturers' published instructions, battery capacity and de-rating calculations, NAC voltage drop calculations, mounting heights of wall-mounted devices, minimum sound pressure levels, pathway diagrams to the supervising station	NFPA 72 §7.2.1
General information, sequence	Premises, owner, installer, symbols, date of issue and revision dates on every sheet (§7.4.4). Sequence of operation as an input/output matrix or a narrative (§7.4.9).	§7.4.4, §7.4.9
Floor plans	North arrow, graphic scale, walls and doors, partitions within the top 15 percent of ceiling height, room use, devices, primary power disconnect, devices and conductors per circuit, ceilings over 10 ft and beams, pathway class and survivability level with EOL locations	§7.4.5
Riser diagram	Cross-section arrangement, number of risers, circuits per riser, devices per circuit per floor, number of conductors per circuit	§7.4.6
Control unit diagram, typical wiring	Control unit diagram: equipment and location, field wiring terminals and identification, circuits connected, indicators and controls. Typical wiring: initiating devices, notification appliances, remote indicators, annunciators, remote test stations, EOL and power supervisory devices.	§7.4.7, §7.4.8
Calculations	Battery capacity with correction factor; NAC voltage drop; other (for example line resistance)	§7.4.10, §10.6.7.2
Shop drawing rule	Prepared in accordance with NFPA 72 and submitted for review and approval before installation. The IBC points to NFPA 72 for the content.	IBC §907.1.2

Reviewing the design: numbers to check

Item	Check	Source
Smoke detector spacing, smooth ceiling	30 ft nominal with half-spacing to walls, or every point within 0.7S (21 ft). Partitions within the top 15 percent of the ceiling height act as walls. Spacing beyond this needs a documented performance-based design accepted by the AHJ.	§17.7.4.2.3
Smoke detectors and beams	Beams shallower than 0.1H: smooth-ceiling spacing. Beams at least 0.1H deep and at least 0.4H apart: a detector in each pocket. Beams at least 0.1H deep but closer than 0.4H: spacing at right angles to the beams is cut to half.	§17.7.4.2.4
Heat detectors above 10 ft	Multiply the listed spacing: 10-12 ft 0.91, 12-14 0.84, 14-16 0.77, 16-18 0.71, 18-20 0.64, 20-22 0.58, 22-24 0.52, 24-26 0.46, 26-28 0.40, 28-30 0.34. The table stops at 30 ft.	Table 17.6.3.5.1
Control unit	Highest switch, lamp, or display 6 ft maximum; lowest 15 in. minimum. Smoke detection at the control unit, NAC power extenders, and transmitters where not continuously occupied (2022 lets the AHJ accept a risk analysis instead).	§10.4.4, §10.4.5
Audible, public and sleeping modes	Public: greater of 15 dB over average ambient or 5 dB over the maximum lasting 60 s or more, at 5 ft; 110 dBA ceiling. Sleeping rooms: the greatest of those two or 75 dBA at the pillow, with a 520 Hz signal from listed equipment.	§18.4.4.1, §18.4.6
Visible, wall-mounted	Entire lens 80-96 in. Candela by room size: 20x20 15; 28x28 30; 30x30 34; 40x40 60; 45x45 75; 50x50 94. Not centered or not square: greater of the farthest wall or twice the farthest adjacent wall.	§18.5.5.1, Table 18.5.5.7.1(a)
Visible, other	Ceiling above 30 ft: suspend at or below 30 ft or go to wall mounting. Corridors up to 20 ft wide: 15 cd, 15 ft from the ends, 100 ft apart. Sleeping: 177 cd if the lens is within 24 in. of the ceiling, else 110 cd. Consider obstructions, including the direct view of corridor appliances.	§18.5.5.6-§18.5.5.10
Pathways	Class A and X need a true return path (no branches or spurs) and separated outgoing and return routes. Level 1 = sprinklered building plus metal raceway; Level 2 = 2-hour protection; Level 3 = both; Level 4 = 1-hour.	§12.3, §12.4

Calculations that get approved or rejected

Battery: Ah = (standby A x 24 h + alarm A x 5/60 h) x 1.25. Use 15 minutes at maximum connected load when the system has emergency voice/alarm communications. Choose the next larger standard battery. The 2022 factor is 1.25, not the old 20 percent margin: a package prepared under an older edition can fail by a narrow margin.
Voltage drop: start from the lowest voltage the control unit delivers on batteries (the data sheet value, not 24 V), use the round-trip length (2 x one-way), and the maximum alarm current. R = 2 x length x (ohms per 1,000 ft) / 1,000; drop = I x R. Putting the whole load at the far end is the conservative method; when the sheet shows appliances spread along the circuit, add the drop of each segment using the current that segment carries. The voltage at the last appliance must still be at least the appliance's minimum operating voltage.
Sound: in a free field, the level falls 6 dB for each doubling of distance. Use the greater of the two public-mode criteria. Loop and NAC capacity come from the data sheet; a spare-capacity percentage comes from the specification, not NFPA 72.

Conflicts, deviations, and approvals

The code is a floor. When the specification or drawings are more stringent, you provide the more stringent. When they conflict with each other or with the adopted code, you do not pick the cheaper reading: you issue a written RFI and design to the more stringent meanwhile. The AHJ enforces the edition it adopted.
Equivalency (§1.5): an alternative of equal or better protection needs technical documentation submitted to the AHJ and the AHJ's approval. Performance-based spacing or layouts follow the same logic: documented design basis, then AHJ acceptance.
Qualifications (§10.5): designers show qualification by state or local registration, licensure, or certification, or by certification from a nationally recognized organization acceptable to the AHJ (NICET is the usual example). Local law, such as a PE requirement, can be stricter.
Deferred submittals (IBC §107.3.4.1): the building official must approve the deferral first, and the registered design professional in responsible charge lists the deferred items on the construction documents. The documents then go through that professional, who forwards them to the building official; nothing is installed until approved. Changes after approval (IBC §107.4) are resubmitted as amended documents, then captured on the record drawings (§7.5.5).
Revision control: every sheet carries its date of issue and revision dates (§7.4.4). Cloud each change, list it in the revision block, and answer every comment.
Review actions: 'Approved' and 'Approved as Noted' let work proceed; 'Revise and Resubmit' does not.

Other 2022 items a reviewer should catch

Abandoned fire alarm equipment is removed, and marked 'not in service' until it is (§10.4.7). The NEC adds that the accessible portion of abandoned fire alarm cable is removed unless it is tagged for future use (760.25).
A notification appliance circuit does not activate other NACs. A supervised notification appliance control circuit is monitored for integrity, gives trouble on a fault, and serves only one notification zone (§10.17).
Elevator work: hoistway initiating devices must be serviceable from outside the hoistway (§21.3.7); shutdown heat detectors sit within 2 ft of each sprinkler and are rated lower (§21.4); HVLS fans that NFPA 13 requires to stop on waterflow are interlocked through the fire alarm system (§21.8); a system dedicated to elevator recall and supervisory service needs no manual boxes (IBC §907.2, NFPA 72 §23.8.5.1.3).
Air-sampling pipe networks are designed from the manufacturer's computer-based fluid-dynamics calculation (§17.7.4.6).
Cables are supported from the building structure, never from the ceiling grid or its support wires (NEC 760.24, 300.11).

Common traps:

20 percent versus 1.25: use the factor for the exam edition, and remember 15 minutes for voice.
Listed is not the same as listed compatible with that control unit.
A 30x30 ft room needs 34 cd, not 30 cd. Off-center or non-square rooms are sized from the larger effective dimension.
The entire lens must sit between 80 and 96 in., not just the centerline.
Voltage drop starts at the battery-end voltage and uses the round-trip length.
Sprinklers plus metal raceway is Level 1, never Level 2.
A PE seal or a manufacturer letter does not replace AHJ approval of a deviation.
A field change is not covered by the original approval. Moving appliances changes loading, voltage drop, and coverage, but not the battery calculation when total current is unchanged.

Finding it in your printed books:

NFPA 72 index: 'Documentation', 'Shop drawings', 'Equivalency', 'Qualifications', 'Power supplies, secondary', 'Visible notification appliances', 'Detectors, spacing', 'Pathway survivability'. The first digits of a section number are its chapter.
Tab §1.5, §7.2.1, §7.4.5, §10.4.4-10.4.5, §10.5, §10.6.7.2, Table 17.6.3.5.1, §17.7.4.2.3, Table 18.5.5.7.1(a) and (b), and §12.4. An asterisk after a section number means Annex A text.
IBC: tab Chapter 1 (§107, construction documents and deferred submittals) and §907.1; the index entries 'Fire alarm systems' and 'Construction documents' lead to both.
NFPA 70: tab §760.24, §760.25, §760.41(B) and §760.121(B), and §300.11.

What to tab in your books

Section	Why
NFPA 72 §1.5	Equivalency: technical documentation to the AHJ, AHJ approval
NFPA 72 §7.2.1	Minimum required documentation, including mounting heights and sound pressure levels
NFPA 72 §7.3	Design documents: pathway class and survivability designations
NFPA 72 §7.4.4–7.4.5	General information, date of issue and revisions; floor plan contents
NFPA 72 §7.4.6–7.4.8	Riser diagram, control unit diagram, and typical wiring contents
NFPA 72 §7.4.9–7.4.10	Sequence of operation and required calculations
NFPA 72 §10.3	Equipment listed for the purpose and compatible with the control unit
NFPA 72 §10.4.4–10.4.7	Control unit heights; smoke detection at control equipment; abandoned equipment
NFPA 72 §10.5	Personnel qualifications, including system designers
NFPA 72 §10.6.7.2	Secondary power: 24 h + 5 min (15 min voice); 1.25 correction factor
NFPA 72 §10.17	Notification appliance circuits and supervised control circuits
NFPA 72 §12.3 and §12.4	Pathway classes and survivability levels
NFPA 72 Table 17.6.3.5.1	Heat detector spacing reduction by ceiling height
NFPA 72 §17.7.4.2.3–17.7.4.2.4	Smoke detector spacing, 0.7S, and beams; §17.7.4.6 for air sampling
NFPA 72 §18.4.4.1 and §18.4.6	Public-mode and sleeping-area audibility (Annex D covers intelligibility)
NFPA 72 Table 18.5.5.7.1(a)/(b)	Room spacing candela; §18.5.5.6–18.5.5.10 for obstructions, corridors, sleeping
NFPA 72 §21.3–21.4, §21.8, §23.8.5.1.3	Elevator recall and shutdown, hoistway devices, HVLS fan interlock, dedicated-function systems
IBC §107.3.4.1 and §107.4	Deferred submittals; amended construction documents
IBC §907.1.2	Fire alarm shop drawings: prepared per NFPA 72, approved before installation
NFPA 70 §760.24, 760.25, 760.41(B), 300.11	Cable support, abandoned cable, dedicated branch circuit without GFCI or AFCI

Chapter vocabulary

Shop drawings: Installation drawings prepared by the contractor, showing devices, wiring, and equipment in the form NFPA 72 Section 7.4 requires, submitted before installation.
Submittal: The package sent for review: shop drawings, data sheets, calculations, and related documents.
Record drawings: Shop drawings updated to show what was actually installed (as-builts).
RFI (request for information): A formal written question to the designer to resolve a conflict, omission, or unclear requirement.
Deferred submittal: A portion of the design not submitted with the permit application, to be submitted later through the design professional and approved before installation.
Amended construction documents: Revised documents submitted for approval when changes during construction depart from the approved set.
Equivalency: Use of a system, method, or device of equivalent or superior effectiveness, shown by technical documentation and approved by the AHJ (§1.5).
Performance-based design: A design justified by goals, criteria, and analysis rather than by prescriptive spacing or layout rules; accepted by the AHJ.
Sequence of operation: Description of what each input causes the system to do, as a narrative or an input/output matrix.
Input/output matrix: A table that lists each initiating input and marks every output it must trigger.
Pathway class: Designation (A, B, C, D, E, N, X) describing how a circuit is arranged and how its faults are tolerated.
Pathway survivability level: Designation (0 to 4) describing protection of a pathway against fire damage, such as sprinklers with metal raceway or 2-hour cable.
Acoustically distinguishable space (ADS): A zone or subdivision with its own acoustic, environmental, or use characteristics, used to plan voice intelligibility.
Effective intensity (candela): The light output rating of a visible notification appliance used in the room spacing tables.
Correction factor (battery): The 1.25 multiplier NFPA 72-2022 applies to the calculated amp-hours (the earlier editions used a 20 percent margin).
Voltage drop: The loss in voltage along circuit conductors, equal to current times conductor resistance.
Listed compatible: Evaluated by a testing laboratory for use with a specific control unit, not merely listed on its own.
Reflected ceiling plan (RCP): A plan that shows the ceiling as if reflected onto the floor: lights, diffusers, soffits, heights, and beams.
Revision cloud: A cloud-shaped outline drawn around a changed area, tied to a revision number in the revision block.
Approved as Noted: A review action that lets work proceed with the reviewer's corrections; Revise and Resubmit does not.
Authority having jurisdiction (AHJ): The organization or individual that enforces the code and approves plans, equipment, and installations.
Abandoned equipment: Fire alarm equipment no longer in use. NFPA 72-2022 requires it to be removed and to be marked "not in service" until it is removed.
Supervised notification appliance control circuit: An output circuit that activates notification appliance circuits on control equipment (for example a power extender); monitored for integrity, trouble on a fault, one notification zone.

32 practice questions cover this chapter, each with an explanation and the code section. Get lifetime access or try the free practice exam.

Shop Drawings and Submittals (NFPA 72 Ch. 7, 10, 12, 17, 18, 21)

What NICET expects at Level III (task 3.3.1)

What a complete submittal contains

Reviewing the design: numbers to check

Calculations that get approved or rejected

Conflicts, deviations, and approvals

Other 2022 items a reviewer should catch

What to tab in your books

Chapter vocabulary

More Level III study guides