SECTION 3 SELECTION AND INSTALLATION OF WIRING SYSTEMS布线系统的选择和安装
3.1 GENERAL概述
The requirements of this Section apply to the lection and installation of low voltage wiring systems to determine compliance with Section 1. The requirements relate to the following:
(a) Protection against external influences and environmental conditions (e Clau 3.3).
(b) Mutual detrimental influences.
(c) Selection of conductors to satisfy current-carrying capacity, voltage drop and other minimum size requirements.
(d) Reliability and electrical continuity of connections, joints and terminations.
(e) Identification (by colour or other means) 标识（通过颜色或其他方法）.
(f) Fire protective measures防火措施.
Earthing and equipotential bonding conductors shall comply with this Section in addition to the requirements of Section 5.
接地和等电位接驳导线应遵守本部分规定以及第5部分的要求。
3.2 TYPES OF WIRING SYSTEMS 接线系统类型
3.2.1 General概述
The type of wiring system ud shall either 所用接线系统应—
(a) be in accordance with Table 3.1; or 遵照表3.1；或
(b) have a degree of safety equivalent to that given in Table 3.1 and comply with the requirements of this Section.
安全等级与表3.1给出的相当，并遵守本部分的要求。
Method fo installation安装方法 | Resting on a continuous surface without fixing or fixed directly to a surface无固定或直接固定在静止表面 | In a wiring enclosure布线机柜中 | Supported on cable tray or supported on cable ladder用线盒支撑 | Supported by catenary system用吊悬线支撑 | Buried direct in the ground直接埋入地下 | Buried in the ground in a wiring enclosure用线柜埋入地下 | Some typical situation and u一些绝缘使用的类型 | 捉野鸡
Type of cable线类型 |
Insulated cables(without sheath)绝缘电缆（无护套） | 德意志意识形态读后感 N/P | P | N/P | N/P | N/P | P | ·in a wiring enclosure ·on the surface太白花 ·in the structure ·buried in the ground |
阪上走丸Sheathed cabies or aumoured and sheathed cables装有护套或铠装电缆 | P | P | P | P | P | P | ·indoor and outdoor locations with necessary protection(non-armoured) ·embedded in the structure ·indoor and outdoor locations with risk of impact or rough conditions(armoured) ·buried in the ground(where direct with necessary protection) |
Mineral insulated metal sheathed cables矿物质绝缘金属护套电缆 | P | P | P | N/P | N/P | N/P | ·indoor and outdoor locations ·参加夏令营英语emergency system wiring |
Served mineral insulated metal sheathed cable为矿物质绝缘金属护套电缆 | P | P | P | N/P | P | P | ·indoor and outdoor locations 另类的网名·emergency system wiring ·buried in the ground(where direct with necessary protection) |
Fire resistant cable(sheathed)防火电缆（护套） | P | P | P | P | P* | P | ·in areas of fire risk ·emergency system wiring |
| | | | | | | |
Key: P-Permitted N/P-Not Pemitted P*-Permitted subject to any manufacture’s instructions
3.2.2 Installation methods 安装方法
Examples of methods of installation of wiring systems are shown in Table 3.2.接线系统的安装方法实例如表3.2所示。
3.3 EXTERNAL INFLUENCES 外部影响
3.3.1 General概述
Wiring systems shall be adequately protected against external influences such as tho outlined in Claus 3.3.2 to 3.3.13, either by construction or by supplementary measures.
3.3.2 Ambient temperature 环境温度
Wiring systems shall be lected and installed so as to be suitable for the highest and lowest local ambient temperatures.
Where materials such as PVC, which are subject to temperature limitations, are ud above 60°C or below 0°C, manufacturer’s instructions shall be followed.
Allowance shall be made for expansion of materials due to temperature variations that may occur in normal conditions of u.
Where the current-carrying capacity is lected in accordance with AS/NZS 3008.1 ries, the reference ambient temperatures shall be as follows:
(a) For cables in air, irrespective of the method of installation:
(i) 40°C for Australia; and
(ii) 30°C for New Zealand.
(b) For cables buried direct in the ground or installed in underground enclosures:
(i) 25°C for Australia; and
(ii) 15°C for New Zealand.
周曲3.3.3 External heat sources 外部热源
To avoid the effects of heat from external sources, including solar gain, one or more of the following methods shall be ud to protect the wiring system:
(a) Shielding.
(b) Placing sufficiently far from the source of heat.
(c) Selecting a system with due regard for the additional temperature ri which may occur.
(d) Reducing the current-carrying capacity.
(e) Local reinforcement or substitution of insulating material.
(f) A method equivalent to one or more of tho listed in Items (a) to (e).
Parts of a cable or flexible cord within an accessory, appliance or luminaire shall either be
suitable for the temperatures likely to be encountered or be provided with additional insulation suitable for tho temperatures.
3.3.4 Prence of water or high humidity水环境或者高湿度场所
A wiring system shall be lected and installed so that no damage is caud by high humidity or entry of water during installation, u and maintenance.
Where water may collect or condensation may form in a wiring system, provision shall be made for its harmless escape through suitably located drainage points.
Where a wiring system may be subjected to wave action (water), protection against mechanical damage shall be provided in accordance with Claus 3.3.7, 3.3.8 and 3.3.9.
TABLE 3.1 ACCEPTABLE TYPES OF CABLE WIRING SYSTEMS
表 3.1 电缆布线系统可接受类型
TABLE 3.2 EXAMPLES OF METHODS OF INSTALLATION OF WIRING SYSTEMS
表 3.2 接线系统安装方法的实例
3.3.5 Prence of solid foreign bodies杂物
A wiring system shall be lected and installed so as to minimize the entry of solid foreign bodies during installation, u and maintenance.
