Clause-by-clause translation of GB 50303-2015: incoming inspection, switchboard, conduit, cable and luminaire installation, insulation testing, earthing, lightning protection.
| Document | GB 50303-2015 Acceptance of building electrical works |
| Edition | 2015 |
| Status | Current (mandatory, GB) |
| Issued by | MOHURD China, in force since 1 August 2016 |
| Applies to | Acceptance of building electrical installation quality up to 35 kV |
| № | Chapter / section |
|---|---|
| 1 | General provisions |
| 2 | Terms and symbols |
| 3 | Basic requirements |
| 4 | Transformers and box-type substations |
| 5 | Switchboards and panels |
| 6 | Motors and heaters |
| 7 | Diesel generators |
| 8 | UPS and EPS |
| 9 | Testing and trial run |
| 10 | Busway |
| 11 | Ladders, trays and trunking |
| 12 | Conduit installation |
| 13 | Cable installation |
| 14 | Wiring in conduits |
| 15 | Sheathed-cable direct wiring |
| 16 | Steel-cable wiring |
| 17 | Terminations, connections, insulation tests |
| 18 | Luminaire installation |
| 19 | Special luminaires |
| 20 | Switches, sockets, fans |
| 21 | Lighting trial operation |
| 22 | Earthing installations |
| 23 | Earthing busbars in substations |
| 24 | Air terminals and down conductors |
| 25 | Building equipotential bonding |
GB 50303-2015 in force since 1 August 2016, applies to building electrical installations up to 35 kV. 25 chapters + 8 annexes. Every chapter has mandatory items (主控项目) and general items (一般项目).
3.1 Work per approved design; only accepted equipment allowed.
3.2 Incoming inspection: CCC certificates, appearance, completeness, factory test reports.
3.3 Stage handover confirmation, including concealed works with acts.
3.4 Acceptance by divisions; quality graded qualified/unqualified.
Plumb and rigid mounting; row alignment; enclosure and door-frame earthing (bonding jumpers); contact joints; circuit and device marking; torque per annex E; IP class per room conditions.
12 Conduit bending radius ≥ 6×OD (10×OD hand bending); threaded/compression joints; glands at boxes; metallic conduit earthing.
13 Cable bending radii per cable type; labeling at ends; fixing spacing for vertical runs.
14 Conduit fill ≤ 40%; splices only in boxes; phase/neutral/PE marking.
17 Insulation resistance after installation: ≥ 0.5 MΩ for LV circuits; joints by soldering/crimping/screw terminals.
18 Luminaires fixed to load-bearing structures; no hanging on conductors; separate anchors above 3 kg.
20 Installation heights per design; socket earth contact to PE; no phase-neutral jumper inside socket; bathroom sockets on RCD-protected circuits.
21 Trial run of all lighting circuits — continuous operation (≥ 24 h for residential/public buildings) with current/voltage measurements.
22 Earth electrodes and loop, welded joints checked, earth resistance measured.
23 Earthing busbars: green-yellow marking, continuity.
24 Air terminals and down conductors: continuity tests, welded/special clamps.
25 Equipotential bonding integrity, transition resistance checks.
GB 50303-2015 is the Chinese equivalent of acceptance norms (PUE ch. 1.8 / SP 76.13330): incoming inspection, concealed works acts, 0.5 MΩ insulation test, 24 h lighting trial. The difference: strict formalization — every step documented.
Automatic single-line diagrams, PUE/GOST/IEC calculations, specification and PDF — from one model.
Start freeData is for reference. Final design decisions must follow current regulations and a qualified engineer.
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