successive sections of the drill steel, you repeat the steps as  outlined. NOTE: Clean and lubricate all drill steel sections and coupling before storing. After  drilling  four  consecutive  boreholes,  the  drill steel  should  be  rotated  or  changed. SAFETY Personnel,  involved  in  rock  drilling  operations, must adhere to the safety guidelines outlined in the U.S. Army   Corp   of   Engineers,   Safety   and   Health Requirements  Manual,  EM  385-1-1.  Additional  safety precautions are as follows: l   Safety   equipment,   such   as   double-hearing protection,  safety  goggles,  respiratory  protection,  hard hats, gloves, and safety boots, must be worn by all personnel  that  are  involved  in  rock  drilling  operations. . Remember to retract the foot piece of the drill guide from the drilling face before moving the drill rig. Failure to do so can cause extensive damage to the hydraulic components of the drill guide. s Never use reverse rotation of the drill to break tight  or  stuck  coupling  joints. . Do NOT allow personnel, other than the operator, to ride on the rock drill. .  Do  NOT  operate  the  drill  with  the  coupling resting on the centralizer arms. . Do NOT move the drifter rotation control lever from forward to reverse without first stopping the drill. l  When  securing  the  drill,  position  the  drill  guide in a 90-degree vertical position. l When the operator is operating the rock drill from the operator’s seat, all personnel must stay clear of the drill  control  console, . Visitors, unless suited properly with all safety gear, must stay clear of rock drilling operations at a distance of no less than 50 feet. l Secure all drilling operations during thunder- storm  conditions. .  Use  gloves  when  handling  drill  steel,  couplings, and bits. These components get extremely hot when used  in  rock  drilling  operations. MISCELLANEOUS  CONSTRUCTION AND  MAINTENANCE  EQUIPMENT Floodlights,   generators,   lubricators,   pumps, sweepers,  and  snow  removal  equipment  are  categorized as  miscellaneous  construction  and  maintenance equipment. This  equipment  is  listed  under  the registration series USN 50-00000. FLOODLIGHTS The floodlight unit (fig. 14-27), commonly known as a light plant, is intended for field use in all climates. Being self-contained, it is especially suited for use in remote locations as an emergency floodlight source. Components The light plant unit consists of an engine generator set, portable floodlights, extension cords, floodlight mounts,  and  a  grounding  rod.  The  floodlights, extension cords, floodlight mounts, and the grounding rod are all accountable collateral gear, assigned to each unit; therefore, it is important that these components are returned  and  stored  in  their  assigned  light  plant.  All  of the components are mounted on a two-wheel trailer, covered by a weatherproof sheet metal housing. Mounting  provisions  for  the  floodlights  are provided  inside  the  housing.  The  floodlights  swivel  in different positions for distributing light over a large area. Extension  cords  are  supplied  for  using  the  floodlights away from the unit.    Special  plugs  are  used  on  these extension cords that are for use only with the floodlight. NOTE: Do NOT run power tools from a light plant. The power surge and power draw from these tools can overload  the  exciter  and  result  in  damage  to  the generater. Operation Before  placing  the  light  plant  in  operation,  make sure the unit is grounded, using the grounding rod and grounding  cable.  Additionally,  ensure  the  light  plant  is positioned suitably for adequate operating room and ventilation for dissipation of engine heat and exhaust. Remove the number of floodlights and cables required and place them in the desired locations. Plug the cables into the output receptacles. 14-22