Operational Circulars 400-499

• OC 415/9 - The boreholes sites and operations regulations 1995
• OC 431/13 - Chemical reactor safety
• OC 433/4 - Control of exposure to fume at coke ovens advice to employers
• OC 438/4 - Medium pressure ductile iron gas pipes not owned by Transco
• OC 440/28 - The gas safety (installation and use) regulations 1998, the gas safety (management) regulations 1996 and the pipelines safety regulations 1996
• OC 440/35 - Gas safety - Alerting members of the public to installer incompetence
• OC 440/37 - Dangerous Gas Fittings (Gas Industry Unsafe Situations Procedure)
• OC 449/7 - Prevention or creation of liquid slugs in flarelines
• OC 480/2 - The electricity at work regulations 1989
• OC 482/2 - Electrical safety of independent low-voltage AC
• OC 483/27 - Oil -filled electrical distribution and other switchgear
• OC 489/6 - The plugs and sockets etc (safety) regulations 1994
• OC 492/2 - The drawing into ventilated electrical tools of conductive dusts