GB 50217-2018 Standard for Design of Cables in Power Engineering

General Provisions

• 第 1.0.1 条To achieve safety, reliability, advanced technology, economic rationality and environmental protection in the…
• 第 1.0.2 条This standard applies to the design of power cables and control cables of 500kV and below in new, expanded, o…
• 第 1.0.3 条Cable design should be integrated with project characteristics, actively adopt new technologies, new processe…
• 第 1.0.4 条In addition to this standard, cable design shall also comply with the provisions of relevant current national…
• 第 第1.0.1条 条The design objectives are clearly defined: as a high occupancy building, the hotel must place particular emph…
• 第 第1.0.2条 条The scope of application is defined: hotel buildings typically involve distribution cables of 10kV and below,…
• 第 第1.0.3条 条Encourage the adoption of energy saving technologies (such as flame retardant cables and intelligent monitori…
• 第 第1.0.4条 条Note that specialized standards such as the Code for Fire Protection Design of Buildings (GB 50016) must also…

Terminology

• 第 2.0.1 条Cable line: a complete system composed of cables, accessories, auxiliary equipment, and structures, suitable …
• 第 2.0.2 条Cable conductor: the metal part of a cable that carries current, usually copper or aluminum, used in hotel po…
• 第 2.0.3 条Cable insulation: the insulating layer outside the cable conductor, ensuring hotel electrical safety and prev…
• 第 2.0.4 条Cable sheath: a covering layer that protects the insulation layer from mechanical damage and environmental in…
• 第 2.0.5 条Cable accessories: including terminations, joints, etc., used for hotel cable connections and branching to en…
• 第 2.0.6 条Cable support bracket: a component that supports cables, used for cable routing in hotel risers, suspended ce…
• 第 2.0.7 条Cable trench: a structure for laying cables underground, suitable for hotel outdoor landscape or parking area…
• 第 2.0.8 条Cable tray: a continuous rigid structure that supports and secures cables, used in hotel corridors or equipme…
• 第 2.0.9 条Fire resistant cable: a cable capable of maintaining circuit integrity under specified conditions, suitable f…
• 第 2.0.10 条Flame retardant cable: cable that prevents flame propagation, used in hotel public areas to reduce fire risk.

Cable selection

• 第 3.1.2 条Cable conductor material selection: Copper conductors shall be used for important loads in the hotel (such as…
• 第 3.2.1 条Cable insulation type selection: Flame retardant cables shall be used in hotel buildings. Power supply cables…
• 第 3.2.3 条Cable sheath selection: For direct burial or conduit laying, steel tape armored or steel wire armored cables …
• 第 3.3.1 条Cable cross section selection: verified against continuous operating current, voltage drop, thermal stability…
• 第 3.4.2 条Cable flame retardant grade requirements: In densely occupied areas (such as hotel lobbies, guest room floors…
• 第 3.5.1 条Cable metallic shielding requirements: Circuits used to suppress electromagnetic interference (e.g., hotel EL…
• 第 3.6.2 条Cable outer sheath color: For fire protection power distribution circuits in the hotel (such as fire pumps an…

Cable cross-section

• 第 3.2.1 条The cable conductor cross section shall meet the requirements for continuous operating current, short circuit…
• 第 3.2.2 条The ampacity of continuously operating circuit cables shall be corrected according to the installation enviro…
• 第 3.2.3 条The cable conductor cross section shall meet the short circuit thermal stability requirements. Cables from th…
• 第 3.2.4 条The voltage drop of cable circuits shall not exceed the permissible value. For long distance power supply cir…
• 第 3.2.5 条The neutral conductor (N conductor) cross section should be the same as the phase conductor or selected accor…
• 第 3.2.6 条The cross section of the protective earthing conductor (PE conductor) shall meet thermal stability requiremen…
• 第 3.2.7 条The cross sectional area of power supply cables for fire protection equipment shall meet the requirement of c…
• 第 3.2.8 条Cable cross section selection should balance economy, considering both initial investment and operating losse…

Cable laying

• 第 5.1.2 条Under any installation method, cable routing shall avoid hazards such as mechanical external forces, overheat…
• 第 5.1.3 条Cable laying shall meet the allowable bending radius requirements. For XLPE insulated cables commonly used in…
• 第 5.3.1 条When cables are laid in cable trays, the trays shall be installed within the ceiling of public areas or in de…
• 第 5.4.1 条When cables are laid in cable trenches or cable wells, waterproofing and drainage measures shall be taken. Ca…
• 第 5.5.1 条When cables are installed in conduits, the inner diameter of the protective conduit shall not be less than 1.…
• 第 5.6.1 条When cables are laid in a vertical shaft, fixed supports should be installed at regular intervals (e.g., 7 m)…
• 第 5.7.1 条When cables are laid in flammable, explosive, or densely occupied areas, flame retardant cables shall be used…
• 第 5.7.3 条Where cables penetrate floor slabs, firewalls and partition walls, they shall be tightly sealed with firestop…
• 第 5.8.1 条Cable terminations and joints should be located where they are accessible for maintenance and protected from …
• 第 5.9.1 条After cable laying is completed, identification plates should be installed at cable terminations, bends, and …

Cable accessories

• 第 6.1.1 条The insulation, sealing, mechanical strength and other properties of cable accessories shall meet the operati…
• 第 6.1.3 条In densely occupied areas (such as hotel guest rooms, restaurants, meeting areas, etc.) and in locations with…
• 第 6.1.4 条Cable terminations and joints shall use self extinguishing materials, and their enclosures shall have suffici…
• 第 6.1.5 条Cable intermediate joints should be installed in dedicated joint boxes or protective enclosures that are fire…
• 第 6.2.1 条The insulation coordination of cable terminations (e.g., where they enter distribution cabinets, transformers…
• 第 6.2.2 条Cable accessories used to connect fire protection equipment (such as fire pumps, emergency lighting, smoke ex…
• 第 6.2.3 条At critical power supply and distribution nodes such as the hotel's substation and generator room , cable ter…
• 第 6.2.4 条The conductor connection hardware of cable accessories (such as terminals) shall be made of copper or tin pla…
• 第 6.3.1 条The installation process for cable accessories shall strictly follow the manufacturer's requirements, and the…
• 第 6.3.2 条For cable joints in hotel wet areas (such as swimming pools, SPAs, and water feature plant rooms), waterproof…

Fire prevention and flame retardancy

• 第 7.0.1 条In locations such as cable passages, cable shafts, and cable interlayers, fire compartmentation measures shal…
• 第 7.0.2 条Openings where cables penetrate floors and walls, and where cable trenches enter buildings, shall be tightly …
• 第 7.0.5 条The selection of flame retardant cables shall comply with the following provisions:<br 1. For cables laid in …
• 第 7.0.6 条The fire resistance performance of fire resistant cables shall comply with the current national standards, an…
• 第 7.0.7 条Firestop sealing shall be applied at openings where cables in cable structures enter electrical cabinets, pan…
• 第 7.0.9 条In cable trenches and cable tunnels, automatic fire extinguishing devices or fire extinguishing equipment sha…
• 第 7.0.10 条When laying cables, avoid parallel or crossing routing with heating pipes, combustible gas pipes, and combust…
• 第 7.0.1 条Summary : For hotel buildings, emphasis should be placed on implementing clauses such as 7.0.3 (firestop seal…

Fire protection and flame retardancy

• 第 7.0.4 条In crowded places (such as hotel lobbies, restaurants, banquet halls, guest room corridors) and places with f…
• 第 7.0.8 条Firewalls or fire stop sections shall be provided at cable tunnels, cable trenches, cable shafts and similar …

Engineering reference only — verify against project conditions and the latest codes.