IEEE 62395-2-2024

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IEC/IEEE International Standard – Electrical Resistance Trace Heating Systems for Industrial and Commercial Applications Part 2: Application Guide for system design, installation and maintenance. (Approved Draft)

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IEEE	2024

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PDF Pages	PDF Title
1	FRONT COVER
4	CONTENTS
9	FOREWORD
11	INTRODUCTION
12	1 Scope Tables Table 1 – Trace heater and surface heater types and related attributes
13	2 Normative references 3 Terms and definitions 4 Surface heating of vessels and piping systems 4.1 Application description 4.1.1 General 4.1.2 Environmental conditions
14	4.1.3 Trace heating systems considerations 4.2 Design information – General 4.2.1 General 4.2.2 Electrical system design
15	4.2.3 Control and monitoring Table 2 – Application types
16	4.2.4 Trace heating system design 4.2.5 Design information documentation 4.3 Thermal system design 4.3.1 General
17	4.3.2 Design conditions 4.3.3 Thermal insulation
19	Figures Figure 1 – Thermal insulation – Weather-barrier installation
21	4.3.4 Heat loss determination Figure 2 – Typical temperature profile
23	4.3.5 Design safety factor 4.3.6 Heat-up considerations
24	4.3.7 Selection of trace heater
26	Figure 3 – Equilibrium conditions for workpiece maintenance Figure 4 – Equilibrium conditions for upper limit evaluation
27	4.3.8 Design calculations 4.3.9 Theoretical sheath temperature calculations – Metallic pipe applications
28	4.3.10 Theoretical sheath temperature calculations – Non-metallic pipe applications
29	4.3.11 Design documentation
30	4.3.12 Start-up at low ambient temperatures 4.3.13 Long trace heater circuits 4.3.14 Chimney effect 4.4 Electrical design
31	4.5 Control and monitoring system design 4.5.1 General 4.5.2 Mechanical temperature controllers 4.5.3 Electronic temperature controllers
32	4.5.4 Application suitability
33	4.5.5 Location of controllers 4.5.6 Location of sensors Table 3 – Recommendations for monitoring and control – Type II and III control
34	4.5.7 Alarm considerations
35	4.5.8 Integrated control 4.5.9 Flow pattern analysis
36	Figure 5 – Heated tank example Figure 6 – Bypass example
37	4.5.10 Dead-leg control technique 4.5.11 Monitoring requirements for fire sprinkler systems 4.6 Special design considerations 4.6.1 General 4.6.2 Freeze protection systems
38	4.6.3 Sprinkler systems, fire suppression
39	4.6.4 Hot water services/tempered water Figure 7 – Fire sprinkler sprig: tapered thermal insulation Table 4 – Recommendations for hot water services and tempered water temperatures
40	4.6.5 Safety shower design requirements 4.6.6 Specialty lines
41	Figure 8 – Double containment system
42	4.7 Installation 4.7.1 General 4.7.2 Personnel aspects Figure 9 – Gravity flow piping systems
43	4.7.3 Preparatory work 4.7.4 Preliminary installation of trace heating circuits 4.7.5 Pre-installation insulation resistance test
44	4.7.6 Installation of trace heater systems Table 5 – Minimum values of Insulation resistance
46	4.7.7 Installation of control and monitoring equipment
47	4.7.8 Necessary modifications 4.7.9 Installation of the thermal insulation system
49	4.7.10 Installation of electrical power 4.7.11 Commissioning
50	4.8 Maintenance 4.8.1 General
51	4.8.2 Training of maintenance personnel 4.8.3 Frequency of inspection 4.8.4 Maintenance program documentation 4.8.5 Visual evaluation
52	4.8.6 Electrical evaluation 4.8.7 Review of the electrical protection system 4.9 Repair 4.9.1 General 4.9.2 Fault location
53	4.9.3 Practicability of repair to electric trace heaters 4.9.4 Repair techniques for electrical trace heaters
54	5 Roof and gutter deicing 5.1 Application description 5.2 Design information – General Figure 10 – Ice dam formation
55	5.3 Thermal design 5.4 Electrical design 5.5 Control and monitoring system design Figure 11 – Downspout to underground drain
56	5.6 Special design considerations 5.7 Installation 5.7.1 General 5.7.2 Trace heaters and component mounting
57	Figure 12 – Roof and gutter trace heater arrangement Figure 13 – Gutter detail
58	Figure 14 – Typical roof mounting methods
59	5.8 Maintenance 5.9 Repair 6 Rail heating 6.1 Application description 6.1.1 General Figure 15 – Drain detail for flat roof
60	6.1.2 Switch point heating 6.1.3 Contact/live rail heating 6.1.4 Track heating 6.1.5 Catenary/pantograph shoe heating
61	6.2 Design information 6.2.1 General 6.2.2 Weather data 6.2.3 Rail system description 6.2.4 System design
62	6.3 Thermal design 6.3.1 Heating load determination 6.3.2 Typical heating load 6.4 Electrical design 6.5 Control and monitoring system design
63	6.6 Special design considerations 6.6.1 Electrical considerations 6.6.2 Finite element analysis 6.7 Installation 6.7.1 General
64	6.7.2 Point heating 6.7.3 Swing nose crossing Figure 16 – Typical positioning of point trace heater on stock rail and switch rail Figure 17 – Typical positioning of trace heater on swing nose crossing
65	6.7.4 Clamp lock heating 6.7.5 Contact/live rail heating and track heating Figure 18 – Typical clamp lock trace heater Figure 19 – Typical positioning of trace heater on steel and aluminium clad contact rails
66	6.7.6 Catenary/pantograph shoe heating 6.8 Maintenance 6.9 Repair 7 Snow melting 7.1 Application description Figure 20 – Typical positioning of trace heater in pantograph shoe
67	7.2 Design information 7.2.1 General 7.2.2 Weather data 7.2.3 Construction details of workpiece 7.2.4 Electrical considerations 7.2.5 System performance level
68	7.2.6 Trace heater layout and component mounting Table 6 – Typical snow melting heat loads
69	Figure 21 – Snow melting trace heater embedded in concrete
70	Figure 22 – Snow melting trace heater located in conduit
71	7.3 Thermal design – Power output (heat load) determination Figure 23 – Expansion joint detail Figure 24 – Snow melting junction box location
72	7.4 Electrical design 7.5 Control and monitoring system design 7.6 Special design considerations
73	7.7 Installation 7.8 Maintenance 7.9 Repair
74	8 Floor warming 8.1 Application description 8.2 Design information 8.2.1 General 8.2.2 Environmental data 8.2.3 Construction details of workpiece 8.2.4 Electrical considerations 8.2.5 Trace heater layout and component mounting
76	8.3 Thermal design – Heat load determination Figure 25 – Typical floor warming trace heater mounting
77	8.4 Electrical design 8.5 Control and monitoring system design 8.6 Special design consideration Figure 26 – Typical floor heating power requirements
78	8.7 Installation 8.8 Maintenance 8.9 Repair 9 Frost heave prevention 9.1 Application description
79	9.2 Design information 9.2.1 General 9.2.2 Construction details of the floor 9.2.3 Electrical considerations 9.3 Heat load determination 9.3.1 General Figure 27 – Typical frost heave prevention substructure
80	Figure 28 – Frost heave prevention power requirements
81	9.3.2 Trace heater layout and component mounting 9.4 Electrical design 9.5 Control and monitoring system design 9.5.1 Control options 9.5.2 Monitoring 9.6 Special design considerations
82	9.7 Installation 9.8 Maintenance 9.9 Repair 10 Underground thermal energy storage systems 10.1 Application description
83	10.2 Design information 10.2.1 General 10.2.2 Environmental data 10.2.3 Construction details of building 10.2.4 Electrical considerations 10.2.5 Trace heater layout and component mounting
84	10.3 Thermal design – Heat-loss determination 10.4 Electrical design 10.5 Control and monitoring system design Figure 29 – Typical underground thermal energy storage system installation
85	10.6 Special design considerations when trace heaters are located in sand layer 10.7 Installation 10.7.1 General 10.7.2 Installation in sand 10.7.3 Installation in concrete
86	10.8 Maintenance 10.9 Repair
87	Annex A (informative) Pre-installation checks
88	Annex B (informative) Trace heater commissioning record
89	Annex C (informative) Maintenance schedule and log record
90	Bibliography

Additional information

Standard Title	IEC/IEEE International Standard – Electrical Resistance Trace Heating Systems for Industrial and Commercial Applications Part 2: Application Guide for system design, installation and maintenance. (Approved Draft)
Published Code	IEEE
Publication Date	2024

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