Comparison of the Three Responsible Parties
| Dimension | Design Institute | General Contractor (EPC/ELV Contractor) | Manufacturer (Security Manufacturer/System Integrator) |
|---|---|---|---|
| Regulatory & System/Uniformity | Strong: familiar with national/industry standards, good system coordination (e.g., fire alarm & access control interlock) | Medium: relies on own tech team, may incomplete citations of mandatory codes (especially fire/seismic/trembling) | Weak to Medium: focuses on own product ecosystem, cross-system standard integration varies |
| Product Detail Grasp | Weak:does not know specific brand/model parameters; selections are generic (e.g., "≥2MP IP camera") | Medium: familia with common brand product lines but tends to use own distributed or miliar products (e.g., Hikvision 2/3 series, Dahua H series general types) | Strong: very familiar with own products (e.g., Hikvision Pro series, Axis P12 series) parameters, installation requirements, compatibility |
| System Integration Perspective | Medium: can design overall architect but may not dive into sub-system protoccol interface details (e.g., ONVIF Profile G, HTTP API) | Strong to Medium: experi&nced GC kan coordinate 10+ subsystems (network, access, video, alarm, PA, etc.) for commissioning | Weak to Medium: concrated on own product line; cross-brad integration limited (unless platform-type manufacturer like Hikvision iVMS integrating Dahua devices) |
| Interface Clarity & hange Response | Vague:design institute mostly outputs drawings, does not involve in construction; site changes require design change orders, long cycle of 3–7 days | Clear: GC is responsible for detail design + construction; changes can be adjusted on site and later supplemented on drawings; but may simplify design to cut cost | Clear: manufacturer supports own product installation; change response fast (usually within 24 hours) but may refuse to change designs for other brand equipment |
| Cost Control Tendency | Neutral but conservative: designs at lower bound of standards, no excess config; but does not consider brand-specific discounts, may cause waste | Biased to own solution: may recommend high-margin product lines (e.g., certain brand storage, switch), actual total cost may not be lowest | Biased to own but transparent product cost: recommends own products, total cost controllable, but unit price may be high (e.g., Axis mid-high series) |
| Responsibility Definition Clarity | Clearly bound to contract & design code: design institute seals drawings; design errors (e.g., duct collision, load calculation wrong) its liability | Clear but with gray area: GC responsible for detail + construction; if detail design error causes rework, GC on the hook; but if system performance fails due to bad product selection, disputes with manufacturers arise | Clear but limited: manufacturer only responsible for own design part; if inter-system protoccol mismatches or communication breaks, manufacturer may be exempt |
Key Judgement Criteria & Trade-off Logic
- Regulatory & System Uniformity: If the project involves fire alarm interlocking (e.g., fire alarm releasing access control), seismic brackets, ELV room sizing mandatory codes, design institute is best choice. But in practice, design institute's ELV drawings are often too coarse (e.g., "cameras detailed by surveillance manufacturer"), requiring second-stage detailing. Then design institute + manufacturer/GC cooperation is common.
- Product Detail & Integration: When using mainstream brands like Hikvision, Dahua, Uniview, manufacturer's detail design can be accurate to model, installation height, angle, cable length, avoiding wrong procurement. But when mixing multiple brands (e.g., Hikvision cameras, Allegion access control, Dell storage), still need GC or third-party integrator for system-level coordination.
- Change Response: In Southeast Asia projects with tight schedules, owners often choose GC or manufacturer on-site detailing, low change cost. If design institute is overseas and cannot do site survey quickly, change cycle often exceeds 1 week, not suitable for continuious construction.
- Responsibility Division: After design error occurs, if design institute issued drawings but GC did not review before construction, liability is often split "60% design institute + 40% GC" (subject to actual project experience). If manufacturer's detail design causes incompability with other subsystems, liability is clear.
Selection Recommendation: By Project Complexity & Owner Management Capability
| Project Type | Owner Management Capability | Recommended Detail Design Party | Rationale |
|---|---|---|---|
| Simple surveillance project (<50 cameras + standalone NVR) | Strong (has dedicated ELV engineer) | Manufacturer | Product detail drawings directly guide installation, fast changes, clear liability |
| Medium complex park (10 subsystems, platform integration requirement) | Medium (has civil engineering department but limited ELV experience) | GC (ELV system integrator) + key manufacturer technical support | GC handles system commissioning & interface integration; manufacturer handles product details; avoids rework due to too broad design institute drawings |
| Large complex building (includes fire alarm interlock, security, network, intelligence) | Weak (hires professional consultant) | Design institute (expanded preliminary) + GC (detail) + Manufacturer (equipment detail) | Design institute enforces code compliance; GC develops detail construction drawings; manufacturer provides product parameters & installation details |
| Ret/expansion project (existing ELV cabling) | Medium to Strong | GC (or manufacture) | Need on-site survey of existing cables; design institute remote drawings easily miss |
Liability & Change Management After Design Errors
In detail design contract/clauses, it is recommended to clarify the following (subject to actual project contract):
- Error Definition: State "design errors" include but not limited to: omission of device points, duct conflicts, model selection mismatching site conditions, system compability non-compliance, failure to meet local mandatory standards (e.g., Thailand TIS standard).
- Responsibility Sequence: If detail design is done by a single party, that party bears all direct modification costs and conequal project delays (e.g., design institute issues revised drawings free of charge, but must complete within X working days). If multiple parties share work, split liability proportionally: e.g., design institute detail drawing error 70%, GC did not review before construction 30%.
- Change Management: All changes must be signed in writing (change order), stating reason, proposing party, added cost & schedule impact. For projects where design institute issued drawings, on-site change proposal by GC or manufacturer must be responded by design institute within 48 hours. If overdue, deemed accepted (subject to contract).
- Preventive Measures: Before detail design start, organize joint site survey among design institute, GC and manufacturer, produce "Site Survey Confirmation Sheet". For large projects, require GC to run BIM clash detection, cost included in detail design fee.
- Arbitration & Compensation Cap: It is recommended to limit compensation for design errors to 2–3 times the detail design fee (not total project value), subject to local law.
Example clause (based on industry common practice, not legal advice): "If the detail design drawings contain errors attributable to the designer causing site rework, the designer shall revise the drawings free of charge until correct, and bear direct material losses and management fees incurred from rework, up to 200% of the detail design contract total. If the GC fails to check drawings before construction and thus the error is not discovered, the GC bears 50% of the rework labor cost."
FAQ
Q: Why does the general contractor's detail design often favor its own products? How to avoid?
A: The GC usually has agency agreement with a certain brand or can get lower discounts, so it will prioritize that brand in detail design. To avoid: in tender requirements, specify "detail design must provide at least three brand options (brand scope specified by owner) and compare equipment parameters & cost"; also in contract, if GC recommends only one brand, it must provide written justification, otherwise deemed design deviation.
Q: During site construction, a conflict is found between camera installation height and fire pipe in the design institute's ELV drawing. Who is liable?
A: If the design institute issued drawings without on-site survey (or did not require survey) and the GC/manufacturer during detailing did not run collision check, liability is typically split "design institute 60%, GC 30%, manufacturer 10%" (subject to actual project experience). Recommend in contract to require design institute to provide "installation space clearance statement", and GC to perform professional clash detection (BIM or 2D overlay check) during detailing.
Q: Can a manufacturer design the subsystem interface with a third-party platform?
A: Some manufacturers (e.g., Hikvision iVMS platform natively supports ONVIF, SDK secondary development) can design standard protoccol integration. But if the third-party platform is non-mainstream (e.g., a localized Thai custom platform), manufacturers usually only provide SDK documentation, not responsible for commissioning. In that case, only GC or specialized integrator can handle the design.
Q: What input documents should the owner provide for the ELV detail design phase?
A: Owner should provide preliminary design drawings (PDF/DWG), architectural/structural/HVAC/electrical plans & sections, equipment list (at least functional requirements), local code requirements, power capacity & tray routing constraints, already procured or designated brand/models (if any). The more detailed the input, the lower the error rate of detail design.