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These specialists should be certified by the electrical safety rank which is no less than a rank
of 3 and should be allowed to work with electrical installations operating at the voltage up to
1000 V. To perform the installation, operation, and repairing of the heating systems it is
necessary to employ the heating engineers. The specialists listed above should be acquainted
with the “User and safety rules for operating electric boilers and boilerhouses” and the given
Operation manual. In the process of working with rust inhibitor, lowfreezing liquid, washing
and clearing agents it is necessary to follow the safety rules for using these substances. On
completion of the tasks listed above the organization (firm) which has performed these tasks
should make an entry in the List (Appendix No. 2) which is assured by the person responsible
for performing these tasks and by the seal of this organization.
Visual examination of the boiler operation can be made by the instructed persons no
younger than 18 years old. These specialists should be acquainted with the given Operation
manual, the boiler construction, and safety rules for visual examination of the boiler
operation.
Connecting the boilers to the power networks of the supply authority
In case of the lack of the allocated power the boiler connecting is performed in
accordance with the established procedure.
It is necessary to note that this procedure of connecting the electric boilers to power
networks is applied to the electric boilers of other types and is not the distinctive feature of
the electrode boilers.
Grounding
By the time of boiler installation the heating system should have the completely
accomplished and tested grounding. The value of resistance of the boiler grounding and the
value of resistance of the heating system grounding should be no more than 4 Ohm. The
copper wire with the cross section of 4-6 sq. mm is used as the conductor for the grounding
(Table 1).
The arrangement of the protective grounding should meet the requirements of the
“Inter-branch rules for electric installations” and the “User and safety rules for operating
electric boilers and boiler-houses”.
All of the open current-conducting parts of the boiler and heating system including
metal pipelines for the cold (return pipe) and hot heat-transfer agent should be grounded.
The place of entering of the conductors into the building or construction should be
marked by the identification sign.
Grounding electrodes
The construction of the grounding electrodes should meet the requirements of the
“Inter-branch rules for electric installations”.
The construction and arrangement of the grounding electrode should provide the
required value of resistance of the boiler grounding and the value of resistance of the heating
system grounding which is no more than 4 Ohm.
The periodical review period of grounding electrode state comprises 12 years.
The rusting wear should not exceed 50%.
It is forbidden to paint the grounding electrode and to safeguard the grounding
electrode against rust by means of the removable or permanent dielectric coating (for
example, rubber or plastic cover).
Before the installation procedure it is necessary to examine the boiler and to check the
completeness of the equipment.
The boiler is installed only vertically into the heating system.
A terminal group (current leads of the boiler) protected from the external influence or
casual touching by the protective housing should be located at the bottom of the boiler. A
phase terminal of the “Ochag” (220 V) electrode boilers should be located at the bottom of
the boiler. It is necessary to use couplings for connecting the boiler connections to the
pipelines of the heating system. A nominal diameter of these couplings should meet the
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