Preventive maintenance checklist with test record

LV Panel Preventive Maintenance Checklist Format, Free PDF

Page 1 is a tick-box checklist for the panel. Page 2 records the electrical tests that go with it: busbar insulation resistance, joint and contact resistance, and earthing.

  • Free
  • No sign-up
  • A4, 2 pages
  • Formulas and limits included
Preview of the LV Panel Preventive Maintenance Checklist form
Download the PDF formA4, 2 pages

Print it at 100 % on A4. Page 1 is the form you fill in. The next page is the worksheet and reference.

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What is inside

  • Panel details, last maintenance date and a permit and isolation check before work
  • Checks for the enclosure, busbars, labels, connections, breakers, relays and interlocks, each with OK, Fixed, Action or N/A
  • Insulation resistance table for phase to phase, phase to earth and neutral to earth, with previous values
  • Contact and joint resistance table with a previous-worst column, and an earthing table
  • Sign-off, next maintenance due and an actions-outstanding box

How it was checked

The form has no calculated values. The 1.5 to 2 times joint resistance multiplier is a practical guide, and the note says to use the maker's limit if one is given. It also says that breaker main-contact tests normally need 100 A or more, so a low-current meter is for lugs and joints.

Related

Common questions

How often should an LV panel be maintained?

Many sites do it once a year, with a quicker thermal or visual check more often. Follow the maker and your site procedure, and test again after a fault or after any work in the panel.

What tests go with panel maintenance?

Insulation resistance of the busbars, contact and joint resistance at the main connections, and earth continuity with the earth pit resistance. The form has a table for each.

Using the form

  • Limits and constants come from the standards named above, as commonly quoted. Check them against the edition you work to, and use the stricter of those and your specification.
  • Where a value is a common guide rather than a limit from a standard, the form says so.
  • This is a calculation aid for qualified people. It does not replace the standard, the instrument manual or your site safety procedure.

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Need the instrument as well?

CIE supplies insulation testers, earth testers, oil BDV testers, micro-ohm meters and relay test sets, with test certificate available on request.

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