There is a right way and a quick way; sometimes they are the same thing, but more often we think the right way will delay us from getting to the next three jobs. Consider then that the failure to do something correctly, that might only involve 5 minutes more work, could result in weeks off work with an injury or a lifetime dead (that’s a more permanent delay, is it not?). That perceived need to save time is often why accidents happen, coupled with the certainty that all men have “that it will not happen to me”!
Engineers often don’t safely isolate electrical equipment before working. I worked for decades without correctly locking off electrical equipment before undertaking maintenance or repair work. The Health & Safety culture in the refrigeration industry has certainly improved beyond all recognition from those days, but largely from a paper trail perspective. Engineers still follow less than best practice on a daily basis.
Incorrect isolation can result in electric shock and / or injuries due to equipment starting up unexpectedly. Both outcomes are potentially fatal at worst and can inflict horrendous or life changing injuries at best. Remember, when you joke with colleagues that you got yet another electric shock “only a little tickle”, this is only emphasising to everyone that there are some basics missing in your competence.
Engineers are not always aware of correct isolation procedures and may not have the appropriate training or equipment. We have developed simple training to meet the needs of one contractor whose engineers had suffered a few accidents which could have been avoided with safe electrical isolation practices. In reality most refrigeration engineers need an introduction to / a reminder of good practice. This is part of a larger culture change needed throughout our industry to ensure that we are all safe in an increasingly pressurised work environment.
What we covered – back to basics:
- What to expect when you measure voltage, current, resistance;
- How to measure, using appropriate tools safely;
- Working dead (an odd title but directly related to staying alive);
- Safe electrical isolation;
- Diagnosing electrical faults – probes, fan motors;
- Replacing probes and motors so the replacement works reliably – cable joints.
For practical health and safety to triumph we need a culture change at all levels. The A4 folder of risk assessments we all carry in the vehicle is less important than using the right electrical test and lock off tools and competently isolating and locking off an electrical supply before working on a piece of equipment.
So ask yourself, do you have the below in your tool bag and do you know how to use and apply it following the procedure? If you do, great! If you don’t then correct that today, yours or a colleague’s life might depend on it!
Reinstating the Supply
- Identify the circuit or equipment to be worked on
- Check condition of voltage tester and operation against a known voltage supply
- Isolate supply and secure isolation – lock off (multi lock off if multiple workers)
- Prove circuit dead – use voltage tester and re check against a known voltage supply
- Retain keys and post ‘caution’ and ‘danger’ notices
- Take precautions against adjacent live circuits / equipment – if any
- Issue permit to work
- Work dead.
- Ensure all work is complete
- Ensure all covers and lids are replaced
- Remove lock off and warning notices (multi unlock if multiple workers)
- Reinstate supply
- Turn on equipment locally if possible
- Sign off permit to work.