2024 30 CFR 77.509 – Transformers; installation and guarding

2023 30 CFR 77.509 – Transformers; installation and guarding

2022 30 CFR 77.509 – Transformers; installation and guarding

2021 30 CFR 77.509 – Transformers; installation and guarding

2020 30 CFR 77.509 – Transformers; installation and guarding

2019 30 CFR 77.509 – Transformers; installation and guarding

2016 30 CFR 77.509 – Transformers; installation and guarding

2015 30 CFR 77.509 – Transformers; installation and guarding

2014 30 CFR 77.509 – Transformers; installation and guarding

2010 30 CFR 77.509 – Transformers; installation and guarding

2009 30 CFR 77.509 – Transformers; installation and guarding