Maintenance Benefits and Facilities
A well-executed maintenance program can provide the following benefits:
- Longer life of switchboard and fewer replacements;
- Reduced time on repairs and overhauls, and the option of scheduling them at an opportune time;
- Fewer failures with unexpected outages;
- Timely detection of any undesirable operating conditions which require correction;
- Improved plant performance and increased operating economies
Maintenance tests are applicable as indicated:
- Insulation resistance tests of the switchboards’ breakers and bus can be useful in determining the condition of the insulation if they are performed regularly. Since definite limits cannot be given for satisfactory insulation resistance, a record must be kept of the readings and comparisons made. Deterioration of insulation and the need for corrective action can be recognized if the readings are progressively lower after each test.
- High potential tests are not required and are not recommended except in special circumstances, such as after repairs or modifications to the equipment that included the primary circuit (bus assemblies).
When such tests are necessary, they may be conducted using 75% of the standard 60-cycle test voltage for new equipment.