1.0.1 This code is applicable to the power supply design of measuring and control instrument of chemical plant and not applicable to the power supply design of instrument repair workshop.
1.0.2 The relevant standards are as follows:
HG/T 20664 Specification of Power Supply Design Engineering for Chemical Enterprises
HG/T 20636.4 Split of Design Work between Instrumentation and Electricity
GB 50058 Electrical Installations Design Code for Explosive Atmospheres and Fire Hazard
GB 50174 Designing Code for Electronic Computer Room
During the implementation of this code, the provisions of current relevant standards of the Nation shall be satisfied too.
2 Instrument Power Supply Scope, Load Level and Power Supply Type
2.1 Power Supply Scope
2.1.1 Power supply for instrument and automation devices includes the following items:
1 Routine instrument system
2 DCS, PLC and supervisory control computer system, etc.;
3 Automatic analyser;
4 Safety Interlock System (SIS);
5 Industry television system.
2.1.2 Power supply for auxiliary facilities includes the following items:
1 Illumination in instrument panel (cabinet);
2 Electric tracing system of instrument and measuring pipeline
2.1.3 Power supply for other automatic monitoring systems.
2.2 Load level
1 General Provisions
2 Instrument Power Supply Scope, Load Level and Power Supply Type
2.1 Power Supply Scope
2.2 Load level
2.3 Power Supply Type
3 Instrument Power Supply Quality and Capacity
3.1 Power Supply Quality
3.2 Power Supply Capacity
4 Power Supply Configuration of Instrument
4.1 Power Supply Configuration Principle
4.2 Common Power Supply
4.3 Uninterruptible Power Supply
4.4 Configuration of Two Types of Power Supply at the Same Time
5 Power Supply System Design and Design Conditions
5.1 Power Supply System Design Principle
5.2 Power Supply System of Common Power Supply
5.3 Power Supply System of UPS
5.4 Power Supply Design Conditions
6 Supply Unit Selection
6.1 AC Uninterruptible Power Supply (UPS)
6.2 DC Stabilized Power Supply and DC UPS
7 Power Supply Equipment Selection
7.1 General Principles for Electrical Equipment Selection
7.2 Selection of Fuse and Breaker
7.3 Equipment Installation
8 Power Supply System Wiring
8.1 Line Laying
8.2 Line Voltage Drop
8.3 Section Area of Power Line
Explanation of Wording in This Code
