BS 7798:1998

Committees responsible
Foreword
Specification
1 Scope
2 References
3 Definitions
4 Heating elements
5 Rating
6 Degree of protection
7 Electrical insulation
8 Thermal insulation
9 Construction
10 Supply connections
11 Terminations for external conductors
12 Provision for earthing
13 Internal wiring
14 Mounting of components
15 Screws and connections
16 Creepage distances, clearances and distances through
    insulation
17 Controls
18 Labels and warning notices
19 Routine testing
20 Instructions
21 Marking
Annexes
A (normative) Methods of test
B (informative) Guidance for installation of immersion
    heaters
Tables
1 Power output
2 Minimum thickness of metallic enclosures
3 Terminal sizes
4 Fastening strength of terminals
5 Dimensions of pillar terminals
6 Dimensions of screw terminals
7 Dimensions of stud terminals
8 Minimum spacings
9 Creepage distances and clearances
10 Temperature marking for supply connections
11 Symbols for marking
    A.1 Torque values for screw torque test
    A.2 Torque values for screw torque test, for terminals
          described in 11.2.3 and 11.3.3
List of references

Defines requirements for industrial electric immersion heaters meant to be permanently installed in cylinders or tanks for heating liquids, where the heaters have fixed, replaceable or removable elements. Not applicable to immersion heaters for mounting over the side of tanks, nor to those designed for household use.

This British Standard specifies requirements for industrial electric immersion heaters designed for permanent installation in cylinders or tanks, for the heating of liquids.

The heaters may have fixed, replaceable or removable elements.

This standard does not apply to immersion heaters for mounting over the side of tanks, nor to heaters designed for household use.