RCDD Exam Study Guide (2026)
Everything the BICSI RCDD Exam (Registered Communications Distribution Designer) tests, topic by topic: what each section covers, the facts that come up most, and how to study it. Pair it with the free 15-question practice test.
The exam at a glance
| Questions | 100 scored items: multiple choice, multiple response and enhanced matching, with 3 to 5 options each |
|---|---|
| Time | 2.5 hours (no scheduled breaks; any break counts toward the time) |
| Passing score | Not published. BICSI sets the cut score by standard setting (Angoff method) and reports pass or fail; practise to 75% or higher |
| Format | Closed book, computer-based; a calculator and a whiteboard are provided |
| Certifying body | BICSI |
| Test provider | Pearson VUE (Pearson Professional Assessments) test centers worldwide |
Mind map: the whole exam on one screen
Read the complete RCDD study notes for “Project Scope, Codes and Standards”
Our first full set of comprehensive notes, about 15 minutes of reading: Codes, standards and the AHJ · Order of precedence · The standards you'll meet most · Defining the scope · Design phases and documents, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.
1. Project Scope, Codes and Standards
The Define Scope of Project area (10%) plus the codes and standards behind every design decision: who the AHJ is, the order of precedence, the main ANSI/TIA and BICSI standards, design phases, and estimating cost and schedule from the scope of work.
Key facts
- Codes (for example the NEC, building and fire codes) become law when the authority having jurisdiction (AHJ) adopts them. Standards (ANSI/TIA, ANSI/BICSI, ISO/IEC) are voluntary unless a code or contract references them.
- Order of precedence: adopted codes first, then contract documents and the standards they reference, then best practice. You may exceed a code, never fall below it.
- Core cabling standards: ANSI/TIA-568 (cabling and components), TIA-569 (pathways and spaces), TIA-606 (administration), TIA-607 (bonding and grounding), TIA-758 (outside plant), TIA-942 (data centers), ANSI/BICSI 002 (data center design).
- The scope of work defines what is in and out of the project; a needs analysis and site survey come before the design.
- Architectural design phases: Schematic Design, Design Development, Construction Documents. ICT should be involved from Schematic Design so spaces and pathways are reserved early.
- CSI MasterFormat: Division 26 Electrical, Division 27 Communications, Division 28 Electronic Safety and Security.
- Cost and schedule estimates follow the scope: quantities from the design, labour units, materials, contingency and the critical path.
Flashcards
Exam tip: When an item asks what the designer 'must' do, look for the code or AHJ answer. 'Should' and 'recommended' usually point to a standard or best practice.
2. Telecommunications Spaces
Locating and sizing entrance facilities, equipment rooms and telecommunications rooms, and coordinating their power, HVAC, lighting, doors and backboards with the other trades. Expect sizing calculations and 'which location is acceptable' items.
Key facts
- Provide at least one telecommunications room (TR) per floor. Add TRs when the floor area served exceeds 1,000 m² (10,000 ft²) or horizontal cable would exceed 90 m.
- Equipment room (ER) guideline: 0.07 m² of floor space for every 10 m² of usable floor space, minimum 14 m².
- Work area planning: one work area for about every 10 m² (100 ft²) of usable floor space unless the client's layout says otherwise.
- Doors at least 0.9 m (36 in) wide and 2 m (80 in) high, no sill, opening outward or sliding where codes allow.
- Avoid locations below water sources, near sources of EMI (large transformers, motors) or with access through other private spaces; don't put spaces in washrooms or janitor closets.
- Backboards: 19 mm (3/4 in) AC-grade plywood, fire-retardant or painted with fire-retardant paint, mounted on the walls of the room.
- Coordinate dedicated electrical circuits, backup power, continuous HVAC (24/7) and lighting with the electrical and mechanical engineers.
Flashcards
Exam tip: Sizing items are quick points: divide the floor area by 10 m², multiply by 0.07 and check the 14 m² minimum before picking an answer.
3. Horizontal Pathways and Cabling
Horizontal cabling from the TR to the work area outlet and the pathways that carry it: distance limits, topology, conduit, cable tray and J-hook rules, fill calculations, cable listings and work area outlets.
Key facts
- Horizontal cabling is a star from the horizontal cross-connect in the TR to each outlet: maximum 90 m of horizontal cable, maximum 100 m channel including all cords.
- One consolidation point is allowed in a horizontal link, at least 15 m from the TR. A multi-user telecommunications outlet assembly (MUTOA) serves up to 12 work areas.
- Conduit: no more than 30 m and two 90° bends between pull points; add a pull box beyond that. Never use a pull box in place of a bend.
- Conduit fill (three or more cables): 40% of the internal area. One cable: 53%; two cables: 31%. Always round the cable count down.
- Cable tray fill: no more than 50% of the inside area and no deeper than 150 mm (6 in) of cable. Non-continuous supports such as J-hooks: no more than 1.5 m (5 ft) apart.
- 4-pair balanced twisted-pair cable: bend radius at least 4 times the cable diameter; pulling tension no more than 110 N (25 lbf).
- NEC listings: CMP for plenums, CMR for risers, CMG/CM for general use. A higher-rated cable may replace a lower one (CMP can be used where CMR is required).
Flashcards
Exam tip: Distance items often hide two limits in one scenario. Check the 90 m horizontal limit and the 100 m channel limit separately.
Test yourself on these topics
Take the free 15-question RCDD test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Backbone, Optical Fiber and Outside Plant
Premises and campus backbone design: hierarchical star topology, media selection, optical fiber types and loss budgets, backbone pathways, and outside plant (OSP) pathways and entrance facilities.
Key facts
- Backbone is a hierarchical star with no more than two levels of cross-connects: main cross-connect (MC) and intermediate cross-connect (IC).
- Fiber loss values (ANSI/TIA-568.3-D maximums): multimode 3.5 dB/km at 850 nm and 1.5 dB/km at 1300 nm; singlemode 1.0 dB/km inside plant and 0.5 dB/km outside plant; 0.75 dB per mated connector pair; 0.3 dB per splice.
Flashcards
Exam tip: Write the loss formula on the whiteboard as soon as the exam starts, then just drop the numbers in. Watch whether the item asks for 850 nm or 1300 nm.
5. Bonding, Grounding, Firestop and Power
Telecommunications bonding to ANSI/TIA-607, lightning and surge protection, electromagnetic compatibility, firestopping penetrations and the electrical power needs of telecommunications spaces.
Key facts
- TIA-607 terms: primary bonding busbar (PBB, formerly TMGB), secondary bonding busbar (SBB, formerly TGB), telecommunications bonding backbone (TBB) and bonding conductor for telecommunications (BCT).
- Size the TBB at 2 kcmil per linear foot, from 6 AWG minimum up to 3/0 AWG. The BCT is at least as large as the largest TBB.
Flashcards
Exam tip: For TBB items, convert metres to feet first (1 m ≈ 3.28 ft), multiply by 2 kcmil and pick the next standard size up.
6. Wireless, Security, AV and Building Systems
The converged systems an RCDD designs cabling and spaces for: Wi-Fi and distributed antenna systems, PoE, electronic safety and security, audiovisual, building automation, data centers and healthcare or residential applications.
Key facts
- PoE power at the switch (PSE) / at the device (PD): 802.3af Type 1 15.4 W / 12.95 W; 802.3at Type 2 30 W / 25.5 W; 802.3bt Type 3 60 W / 51 W; Type 4 90 W / 71.3 W.
- Higher PoE power heats cable bundles; large bundles may need derating or larger-gauge cable. The TDMM 15th edition also covers fault managed power and single-pair Ethernet.
Flashcards
Exam tip: PoE items usually turn on PSE vs PD power. Ask yourself which end of the cable the question means before choosing.
7. Bid, Installation, Testing and Administration
The Support ICT Bid/Tender Process (11%) and Support ICT Installation Process (16%) areas: RFPs, RFQs and RFIs, submittals, inspections, field testing, labeling to ANSI/TIA-606 and close-out documents.
Key facts
- RFP: asks bidders to propose a solution and price. RFQ: asks for a price on a defined design. RFI: asks for clarification of design intent; answers go to all bidders as an addendum.
- Submittals (product data, shop drawings) are produced by the contractor and reviewed by the designer to approve, reject or comment before materials are ordered.
Flashcards
Exam tip: Process items ask who does what and when. Put the documents in order: RFP or RFQ, RFI and addenda, award, submittals, installation and inspections, testing, close-out.
How to pass
- 100 items in 2.5 hours is 90 seconds each. Recall items should take 30 seconds so you have time for the sizing and loss calculations.
- Design ICT Solutions is 63% of the exam. Spaces, pathways, media, bonding and firestop decide most of your score.
- Learn the TDMM numbers exactly: 90 m and 100 m, 30 m and two bends, 40% conduit fill, 0.07 m² per 10 m², 2 kcmil per foot.
- Some items have more than one correct option (multiple response). Read the stem for 'select two' before you answer.
Frequently asked questions
How long should I study for the RCDD exam?
Most working candidates need 4 to 8 weeks at 45 to 60 minutes a day. Book your exam once your Readiness Score has stayed at 80 or higher for about a week.
Can I take the RCDD exam online?
BICSI's v15 handbook describes the RCDD exam at Pearson VUE test centers, not remote proctoring. Format: closed book, computer-based; a calculator and a whiteboard are provided. Check pearsonvue.com/bicsi for the options in your country.
What score do I need to pass the RCDD exam?
Not published. BICSI sets the cut score by standard setting (Angoff method) and reports pass or fail; practise to 75% or higher. The exam has 100 scored items: multiple choice, multiple response and enhanced matching, with 3 to 5 options each and a time limit of 2.5 hours (no scheduled breaks; any break counts toward the time).
What are the most tested topics?
The outline covers project scope, codes and standards, telecommunications spaces, horizontal pathways and cabling, backbone, optical fiber and outside plant, bonding, grounding, firestop and power, wireless, security, av and building systems, bid, installation, testing and administration. Use the free practice test to see which ones you need most.
The premium RCDD study path
Premium RCDD prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.
Your step-by-step study path
- 1Project Scope, Codes and Standards9 key notes, 115 flashcards, then 450 practice questions in 18 sets of 25Notes free with an account
- 2Telecommunications Spaces9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 3Horizontal Pathways and Cabling9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 4Backbone, Optical Fiber and Outside Plant9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 5Bonding, Grounding, Firestop and Power8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 6Wireless, Security, AV and Building Systems8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 7Bid, Installation, Testing and Administration8 key notes, 110 flashcards, then 425 practice questions in 17 sets of 25Premium
- Final step: 6 full mock exams100 questions each, timed like test day. Pass them, then book your exam.Premium
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- The RCDD exam: full prep for the v15 blueprint
- 3,000 practice questions + 6 full mock exams per exam
- 800 flashcards + 60 key notes per exam, by topic, plus mind maps
- Spaced repetition + mistakes bank
- Readiness Score & detailed reports
- Video lessons as they release
- Content updates during your access
- 5 bonuses: numbers and formulas sheet, standards atlas, study planner and more
- Pass Guarantee: complete the prep, pass or 100% back
Renews once a year until you cancel. We email you before each renewal. Cancel any time from your account; you keep access until the end of the year you've paid for.
Summarized from BICSI's official candidate information and the rules cited, checked October 2026. Confirm current requirements with BICSI.