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What grade of caver are you???

I thought it would be interesting to list what the various coloured bezels denote on an Oldham cap lamp.  These NCB codes are strictly adhered to, both above and below ground.

WHITE.  Trainee not allowed to go unsupervised underground.

YELLOW.  Completed training but not allowed within 20 metres of a working coal face.

RED.  Completed basic coal face training but has to work a period of time before he is considered finally coal face trained.

BLUE.  Craftsman, allowed anywhere.

GREEN.  Persons driving roadways but not allowed at a coal face

BLACK.   Allowed at coal face or driving roads.  Completed full coal face training and roadway training.

Martin Grass