Professional competence in electrotechnics according to Act 501978 Coll.

1
Professional competence in electrotechnics
according to Act 50/1978 Coll.

• Workers instructed - 4
• (without professional training or
  experience,only within laboratory training at
  the FBMI, not valid outside the FBMI)

2
Workers instructed (4)- without requirements
for professional training or experience

• were familiarized within the scope of their
  activities with the regulations for the operation
  of electrical devices by the organization,
• were instructed in this activity,
• were warned about the possible dangers of
  electrical devices,
• were familiarized with the giving of first aid
  during electrical current accidents.

3
The danger of electrical current accidents
depends mainly on

• the source voltage,
• the current frequency,
• the wave or pulse shape,
• the duration of the currents passing through the
  organism,
• the current path through the body.

4
Symbology and signs in electrotechnics the
meaning of safety colours
5
Symbology and signs in electrotechnics the
safety meaning of geometric shapes
6
Symbology and signs in electrotechnics safety
notice examples
1) CSN IEC 417
7
Symbology and signs in electrotechnics safety
sign examples
8
What are safety signs or Help those afflicted
by injuries
http//ucjtk.ff.cuni.cz/publikace/12-04/tabulky.ht
m
9
Symbology and signs in electrotechnics
graphical symbols on electrical devices
10
Symbology and signs in electrotechnics labeling
conductors with letters
11
Alternating current nominal voltage according to
the CSN
12
Maximum allowed electric current values

• a steady electric current between parts that
  are touch accessible, flowing through 2000O of
  resistance, must never surpass
• 3,5mA A.C. or 10mA D.C.

13
Basic rules for working in ÚBMI CVUT laboratories

• max. 10 students per one assistant,
• the assistant must check the switching device
  before starting class work,
• the assistant must supervise the correct use of
  protective instruments,
• safety signs and notices are used in the
  laboratory,
• each student has gained professional competence
  (4).

14
Protecting electrical circuits from
short-circuiting and overloading

• safety fuse x circuit breaker,
• use only appropriate and original fuses and
  circuit breakers,
• do not repair fuses and circuit breakers,
• perform the replacement only with unloaded parts.

15
Electrical and electrotechnical device safety
protection classes
16
Electrical and electrotechnical device safety
extension cords (policy)

• two core flexible cords with a plug without an
  earthing contact cannot be used for connecting
  class I. devices,
• extension cords used for extending power
  distribution from outlets must always be triple
  cored,
• flexible cords without a protective conductor
  with a plug without an earthing contact for class
  II. appliances must have their plug inseparably
  connected,

17
Regular check-ups and reviews of electrical
appliances and hand-held electric tools

• hand-held electric tools,
• appliances divided into categories,
• dates set according to usage, protection class
  and category (for appliances),
• the protective conductor connection is checked,
• the insulation resistance is measured,
• the line supply cables are also checked and
  measured,
• standards and recommendations exist.

18
Important regulations

• CSN EN 60601-1 Medical electric instruments Part
  1 General safety requirements,
• CSN 33 0000 4 41 Electrotechnic regulations.
  Electric devices. Part 4 Safety. Chapter 41
  Protection from electrical current accidents,

19
First aid during electrical current accidents

• FREE the afflicted person from the electric
  circuit in a safe and suitable manner,
• find out if the afflicted person is conscious,
  breathing, has a tangible pulse, treat any
  wounds,
• if the afflicted person isnt breathing, then
  apply mouth to mouth artificial respiration,
• if the pulse isnt tangible, then apply indirect
  heart massage (BE CAREFUL about internal
  injuries),
• possible combination of both call a doctor, but
  continue with resuscitation until the doctor
  arrives.

20
First aid during electrical current accidents
clearing airways (and respiration check)
21
First aid during electrical current accidents
mouth to mouth artificial respiration (bending
the head backwards)
22
First aid during electrical current accidents
mouth to mouth artificial respiration (performing)
23
First aid during electrical current accidents
stable position
24
First aid during electrical current accidents
indirect heart massage (preparation and principle)
25
First aid during electrical current accidents
indirect heart massage (performing)