sasasa
Electrical Installations
Electrical apparatus and wiring systems are to be constructed and installed in accordance with the requirements of this Section.
Standard Distribution System
The following are recognized as standard systems of distribution. Distribution systems differing from these will be specially considered.
• Two-wire direct current
• Three-wire direct current
• Two-wire single-phase alternating current
• Three-wire three-phase alternating current
• Four-wire three-phase alternating current
* Three-wire single-phase AC may be used in conjunction with this system for lighting.
Voltage and Frequency Variations (2008)
Electrical appliances supplied from the main or emergency systems, need to designed that capable operated under the normal variation voltage and frequency. The variations from the rated value may be taken from 4-3-1/Table 1. Any special system, such as electronic circuits, which cannot operate smoothly within the limit shown in 4-3-1/Table 1, is not to be supplied directly from the system but by alternative ways, such as through a stabilized supply. For generators, see 6-1-3/3.3.1, 6-1-3/3.5.1, and 6-1-7/5.17.2.
Materials
All electrical equipment is to be constructed of durable and flame-retardant materials. Materials are to be resistant to corrosion, moisture, high and low temperatures, and are to have other qualities necessary to prevent deterioration in the ambient conditions that the equipment may be expected to encounter.
13 Grounding Arrangements
Where not obtained through normal construction, arrangements are to be provided to effectively ground metal structures of derricks, masts and helicopter decks. See also 4-2-6/7.1.3 for fuel storage for helicopter facilities. Grounding arrangements are also to be provided for tending vessels.
Temperature Ratings
17.1 General
In the following requirements, an ambient temperature of 40°C (104°F) has been assumed for locations outside of boiler and engine
Electrical apparatus and wiring systems are to be constructed and installed in accordance with the requirements of this Section.
Standard Distribution System
The following are recognized as standard systems of distribution. Distribution systems differing from these will be specially considered.
• Two-wire direct current
• Three-wire direct current
• Two-wire single-phase alternating current
• Three-wire three-phase alternating current
• Four-wire three-phase alternating current
* Three-wire single-phase AC may be used in conjunction with this system for lighting.
Voltage and Frequency Variations (2008)
Electrical appliances supplied from the main or emergency systems, need to designed that capable operated under the normal variation voltage and frequency. The variations from the rated value may be taken from 4-3-1/Table 1. Any special system, such as electronic circuits, which cannot operate smoothly within the limit shown in 4-3-1/Table 1, is not to be supplied directly from the system but by alternative ways, such as through a stabilized supply. For generators, see 6-1-3/3.3.1, 6-1-3/3.5.1, and 6-1-7/5.17.2.
Materials
All electrical equipment is to be constructed of durable and flame-retardant materials. Materials are to be resistant to corrosion, moisture, high and low temperatures, and are to have other qualities necessary to prevent deterioration in the ambient conditions that the equipment may be expected to encounter.
13 Grounding Arrangements
Where not obtained through normal construction, arrangements are to be provided to effectively ground metal structures of derricks, masts and helicopter decks. See also 4-2-6/7.1.3 for fuel storage for helicopter facilities. Grounding arrangements are also to be provided for tending vessels.
Temperature Ratings
17.1 General
In the following requirements, an ambient temperature of 40°C (104°F) has been assumed for locations outside of boiler and engine