CUI (Controlled Unclassified Information)

A deliberate breach of a safety regulation or worksite rule, where the subcontractor knew the requirement and chose to ignore it. Regulators treat these far more severely than accidental non-compliance. Fines, stop-work orders, or contract termination can follow.

A mandatory safety procedure requiring workers to isolate and de-energise equipment before servicing or maintenance begins. Subcontractors must follow the site owner's LOTO programme and hold current training documentation. Non-compliance can result in removal from site and contract termination.

A workplace danger where a worker's body or clothing becomes trapped, pinched, or pulled into moving machinery, equipment, or materials — common on oilfield and construction sites where subcontractor crews work near rotating equipment, conveyor systems, or heavy moving loads. Subcontractors are responsible for identifying and controlling these hazards through proper guarding, lockout/tagout procedures, and site-specific hazard assessments before work begins.

A system for categorising ground conditions by type, stability, and load-bearing capacity. Subcontractors use it to determine excavation methods, shoring requirements, and equipment suitability. Misreading soil class can trigger safety violations or costly project delays.

The share of electrical capacity a subcontractor's site equipment or temporary facilities must supply during periods of maximum demand. Operators may contractually require field crews to manage or limit equipment startup times to avoid triggering peak load charges. Failing to comply can result in cost penalties passed down through the prime contractor.

Any activity that breaks soil, such as excavating, grading, or driving stakes. Subcontractors must obtain utility locates and permits before starting work. Skipping this step risks fines and liability for damaged lines.

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