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 TM 55-1905-219-14-8
4-15. SEWAGE SYSTEM - MAINTENANCE INSTRUCTIONS.
HIGH VOLTAGE is used in the operation of this equipment.
DEATH ON CONTACT may result if personnel fail to observe safety precautions.
Never work on electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment and who is competent in administering first aid.
Whenever possible, the input power supply to the equipment must be shut off before beginning
work on the equipment. When working inside the equipment, after power has been turned off,
always ground every part before touching it.
Do not be misled by the term "low voltage". Potentials as low as 50 volts may cause death under
adverse conditions.
Sewage is an inclusive term generally applied to the mixture of all liquid domestic wastes,
especially human body wastes. The character of sewage changes from place to place but it always
contains very large numbers of bacteria - hundreds of millions per milliliter - some of which can
cause dangerous illness in man. Typhoid and polio viruses are two examples.
The ingress of these bacteria to the human body is through the mouth or open sores.
It is
important therefore to observe certain elementary precautions.
a. No food or drink of any nature should be taken into sewage handling areas.
b. Personnel with open cuts or sores should not work on sewage handling equipment.
c.
Any sewage spill should be dealt with immediately, before it dries; by washing down with water
and a good quality, non-scented disinfectant. Liquid soaps or scented disinfectants should not
be used since they only serve to disguise improper clean-up.
4-623
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