Area|Teacher Area|Judge Area]
Guidelines for Experimentation, continued
Safety is the watchword
when exhibiting at all STEM Exhibitions. Without exception, the highest
standards of safety are required. The following are safety measures of
All electrical equipment must be constructed according to standard
electric safety codes. If there is doubt, consult with the electric
shop teacher or an electrician. The city of Chicago’s electrical code
for public exhibits requires all electrical devices connected to the
circuits within the building to be grounded, using type SO three-wire
All wiring, switches,
and metal parts carrying current must be completely enclosed by
barriers on all sides to positively prevent observers from reaching
into the exhibit where they might receive an electrical shock. Exhibits
requiring electricity must have the three-pronged or polarized
electrical plug attached to the end of the eight foot or longer
electrical cord on all exhibits except those using lamps only. All
electrical apparatus must have the UL label. All electrical extension
cords needed for STEM Exhibition projects will be provided for
at the Museum. You will not be allowed to provide your own cord.
Doorbell push buttons
must not be used to control 110 volt apparatus. Use toggle or
push-button switches designed for proper load. Non-insulated switches,
such as knife switches, will not be permitted. All electrical joints
must be properly secured and insulated. All electrical joints must be
permanent and soldered.
Commission (FCC) regulations are specific with regard to
spark-discharge equipment. If equipment containing such devices is
used, the machine must be operated so that it does not cause harmful
interference to normal channels of communication. The judges are
sufficiently aware of the operations to understand what is intended
with the spark-discharge device, provided that the student can explain
the operations in his/her own words. Do not operate equipment until
authorized by the judges to do so.
All moving parts of machines and/or electrical circuitry must have
adequate protective coverings or guards.
Push-buttons and levers
must be securely mounted on exhibits. They must not be attached to
tables or walls.