Clauses of EN 602041 Electrical SafetyCEMarkingNet條款的EN 602041電氣安全cemarkingnet

1、clauses of en 60204-1 electrical safetyin addition to being evaluated for conformity to the essential health and safety requirements of the machinery directive, the name product has been inspected for conformity to the voluntary standard, en 60204-1 : 1997 - safety of machinery- electrical equipment

2、 of machines. iec:1997+a1:1999 this evaluation is, generally, a review of the electrical construction, with less focus on the guarding, mechanical, and non-electrical safety aspects of the equipment. the electrical evaluation considers the following types of hazards:· failures or faults in the

3、electrical equipment resulting in the possibility of electrical shock or electrical fire;· failures or faults in control circuits (or components and devices associated with these circuits) resulting in malfunctioning of the machine;· disturbances or disruptions in external power sources as

4、 well as failures or faults in the power circuits resulting in the malfunctioning of the machine;· electrical interference (e.g. electromagnetic, electrostatic, radio interference) either from outside the electrical equipment or internally generated;· stored energy (either electrical or me

5、chanical);· audible noise at levels that cause health problems to persons.the following checklist follows the order of en 60204-1 : 1997, but is in an abbreviated form. the full language of the standard provides additional allowances in some aspects, and imposes additional requirements in other

6、 aspects. this evaluation has been completed with all of these additional allowances and requirements in mind.en 60204-1 paragraph & summarycomplyremarks4.3electrical supply:the equipment shall be designed to operate correctly under full load even if the supply current deviates from nominal.4.3.

7、2 a.c. supplies±10% voltage± 1% frequency4.3.3 d.c. supplies±10% voltage±15% if supply is from batteries4.4physical environment and operating conditions4.4.2electromagnetic compatibilityverifyall components that are emc relevant should be declared in conformity with 89/336/ec, an

8、d it should be verified that all have been installed according to their manufacturer's instructions.4.4.3ambient air temperature+5°c to +40°c4.4.4humidityup to 50% rh at 40°chigher rh (up to 90%) at 20°c4.4.5altitudeup to 1000 meters above sea level4.4.6contaminantselectrical

9、 cabinets of nema 4/4x are ip 56nema 6/6p are ip 67nema 12/12k ip 52nema 13 are ip 544.4.7ionizing and non-ionizing radiationequipment must operate properly when subjected to . . .4.4.8vibration, shock and bumpall conductors are to be tied down or contained in conduit or raceway4.5transportation and

10、 storage4.6provisions for handling4.7installation and operation5incoming supply conductor terminations and devices for disconnecting and switching off5.1incoming supply conductor terminations· single connection if practicable· supply connected to disconnecting device· no neutral condu

11、ctor, unless agreed by the user· no connection between neutral and pe· id terminals per en 604455.2external protective conductor terminalnear phase conductor terminals and of sufficient sizemarked with letters “pe” on only one location on the equipment - if other terminal are provided, the

12、y are to be marked with· 417-iec-5019, or· with green-and-yellow bicolor5.3supply disconnecting (isolating) device5.3.1generalhand-operated disconnect for each incoming supplyinterlocks to be provided if more than one disconnect5.3.2type · switch disconnector en 60947-3; ac-23b, dc-23

13、b· disconnector w/aux contact causing all loads to be switched off before opening main disconnect contacts· circuit breaker en 60947-2 suitable for isolation· plug/socket combination (current _16 a, power _3kw) in conjunction with on/off switch5.3.3requirements of supply disconnecting

14、 device· isolate equipment from supply· one on (marked “i”) and one off (marked “o”) position· cannot indicate “off” until all contacts are actually open· external operating handle, black or grey in color (not red, unless also serving as e-stop facility - see 10.7.4)· must b

15、e lockable in “off” position e.g. w/padlock· must disconnect all conductors of supply circuit· must have capacity to interrupt largest stalled-rotor motor5.3.4supply disconnect operating handleeasily accessible and from 0.6 to 1.7m above service level5.3.5excepted circuits (not required to

16、 be disconnected)· lights needed for maintenance or repair· accessory socket outlets used for maintenance or repair· under-voltage protection circuits that are only used for automatic tripping in the event of supply failure· circuits that must remain energized for satisfactory fu

17、nction (e.g. program storage, product heaters)· safety interlock control circuits (see §15.1.3)· (note: each of the above circuits to be provided with the following:· a permanent warning label close to the supply disconnect· a permanent warning label close to the excepted ci

18、rcuit· a corresponding warning in the maintenance manual)5.4devices for switching off for prevention of unexpected start-up (such as might be used for set-up)· only if machine is not dismantled· only if no work on electrical circuits5.5devices for disconnecting electrical equipmentdis

19、connectors, withdrawable fuse links or other means are to be provided for individual parts of a machine to enable work to be carried out - if the disconnect of 5.3 does not. auxiliary disconnects shall be:· convenient and suitable located for the use· readily identifiable as to which parts

20、 of circuit are disconnected· provided with means to prevent unauthorized closing5.6protection against unauthorized, inadvertent and/or mistaken connectionit is not necessary to provide means for padlocking the disconnect when either the worker in working in an enclosed operating area, or where

21、 the means for reconnection are in his immediate control (e.g. plug/socket).6protection against electric shock6.1general· shall protect against shock from direct and indirect contact6.2protection against direct contact: by method of 6.2.2 or 6.2.3, and 6.2.4 if applicable6.2.2protection by encl

22、osure· opening only with the use of a tool or key, or· (live parts to be protected to at least ip1x or ipxxa, and live parts likely to be touched while resetting or adjusting protected to ip2x or ipxxb)· disconnection of live parts before opening enclosure, or· (live parts after

23、disconnect protected to ip2x)· opening w/o use of tool or key and all live parts protected to ip2x or ipxxb).6.2.3protection by insulation of live partslive parts to be completely covered with insulation that are destroyed on removal. paints, varnishes and lacquers are not considered to be insu

24、lation.6.2.4protection against residual voltages· if stored energy is ³ 60µc, the energy must discharge to 60v or less w/in 5 seconds. (see §20.5 for test)6.2.5protection by barrierssee 412.2 of iec 60364-4-416.2.6protection by placing out of reach or protection by obstacles·

25、; for "out of reach" see iec 60346-4-41, section 412.4· for "by obstacle" see iec 60346-4-41, section 412.36.3.1protection against indirect contact by:· measures to prevent the occurrence of a hazardous touch voltage (6.3.2)· automatic disconnection of supply (6.3.

26、3)6.3.2.1protection against occurrence of hazardous touch voltage· use of class ii insulation (6.3.2.2)· electrical separation (6.3.2.3)· selection or design of supply system (6.3.2.4)6.3.2.2class ii equipment or equivalent insulation· double, or reinforced, or equivalent insulat

27、ion (iec 60536)· switchgear and controlgear insulated per iec 60439-1· supplementary or reinforced insulation (iec 60364-4-41 sec 413.2)6.3.2.3electrical separation of the circuit (60364-4-41 sec. 413.5)6.3.2.4supply system where neutral has high impedance to earth so that earth fault does

28、 not result in hazardous touch voltage.6.3.3protection by automatic disconnection of supply· bonding of all exposed conductive parts to pe plus· device disconnecting from supply in the event of insulation failure tn or tt system or use of earth fault or residual current detection to initia

29、te disconnection of it system (413.1 of iec 364-4-41)6.4.1protection by the use of pelv (protective extra low voltage)· 25 vac, 60 vdc maximum (dry locations & no large area contact) · 6vac, 15 vdc (if not dry or if large area body contact)· one side of pelv circuit connected to p

30、e· live parts of circuits electrically separated from other live circuits (insulation as safety isolating transformer iec 60742)· conductors of pelv circuit separated from other conductors, or, if that is not possible, then insulated to higher voltage (14.1.3)· plugs and sockets not c

31、ompatible with non-pelv circuits6.4.2pelv source shall be:· safety isolating transformer· source of current with same degree of isolation (e.g. motor-gen)· electrochemical source (battery)· electronic power supply that cannot exceed voltages in 6.4.1 even on an internal fault7.1p

32、rotection of equipment - general· protection from overcurrent· protection in event of overload· protection against effects of earth fault· protection against overvoltage due to lightning and switching surges· protection in event of abnormal temperatures· safe in event o

33、f loss or reduction in supply voltage· protection in event of overspeed· protected against effect of incorrect phase sequence7.2overcurrent protection - lesser of . . .· current exceeds rating of any component· current exceeds current capacity of any conductor7.2.2supply conducto

34、rs· buyer responsible to provide overcurrent protection for supply conductors· supplier shall state data necessary for selecting7.2.3power circuits· all live conductors protected· earthed neutral need not be protected, if its area ³ live· neutral conductor discouraged i

35、n it system7.2.4control circuits· conductors connected to supply, and circuits feeding control circuit transformers shall be protected per 7.2.3· for control circuits fed from transformer, where one end of secondary winding is at pe, overcurrent is necessary only on the other end (i.e. not

36、 needed on both legs of circuit)7.2.5socket outlets and their associated conductors· each circuit having maintenance outlets shall have overcurrent protection in unearthed live leg7.2.6local lighting circuits· each circuit supplying local lighting shall have overcurrent protection separate

37、 from other circuits7.2.7transformers· shall be protected in accordance with iec 60076-5 & en 60742· follow recommendations of transformer supplier7.2.8location of overcurrent protective deviceswhere conductors are connected to supply, unless- conductor current capacity is ³ load,

38、 and- each conductor is £ 3 meters in length (fuse to load), and- the conductors are protected by an enclosure or duct7.2.9overcurrent protective devices· breaking capacity ³ prospective short-circuit current· fuses or circuit breakers for power circuits· electronic current

39、limiters are permitted on pelv circuits7.2.10rating and setting of overcurrent protective devices· as low as possible· is determined by current carrying capacity of conductors and devices to be protectedverifyuse of iec-rated fuses.7.3overload protection of motors· shall be provided i

40、n all conductors for motors ³ 0.5 kw· may use overload, temperature sense, or current limiting· if overload is removed by switching off, all live conductors shall be switched off· automatic restarting is to be prevented7.4abnormal temperature protectione.g. resistance heaters sha

41、ll be equipped with suitable detection to initiate an appropriate control response7.5protection against supply interruption or voltage reduction and subsequent restoration· if interruption or brown out will cause malfunction, an undervoltage device shall ensure appropriate protection· the

42、operation of an undervoltage protection shall not impede normal stopping controls· automatic restarting is to be prevented· shall be coordinated with any other machinery that is inter-related7.6motor overspeed protection· automatic restarting is to be prevented7.7earth fault/residual

43、current protection can be used, and if so, shall be set as low as possible consistent with reliable operation of the equipment7.8phase sequence protection shall be provided where incorrect phase can cause a hazardous condition or damage the machine.7.9protection against lightning and switching surge

44、s can be provided.· devices to suppress lighting overvoltage connected on incoming terminals of supply disconnect device· device to suppress switching surges shall be connected across terminal of equipment requiring such protection8.1equipotential bonding - general· this clause provid

45、es requirements for both protective and operational bonding8.2.1protective bonding circuit - general· circuit comprises the pe terminal, conductive structure and protective conductors· all parts of the circuit must be designed to withstand the thermal and mechanical stresses caused by eart

46、h-fault currents· structural parts acting as protective conductors must have adequate cross section8.2.2protective conductors· shall be identified per 14.2.2 , i.e. green-and-yellow if by color alone, or with the 417-iec -5019 symbol· should be copper· if not copper, shall be

47、79; 16 mm² area8.2.3continuity of the bonding circuit· all exposed conductive parts shall be connected· no hazardous voltages present (i.e. low resistance)· connection and bonding points shall not be impaired by chemical, mechanical or electrochemical influences. for aluminum, pa

48、rticular consideration shall be given to the problem of electrolytic corrosion· metal conduits shall not be used a protective conductors, but shall be connected to the protective bonding circuit· where electrical equipment is mounted on hinged panels, protective conductors shall be provide

49、d· where hinged panels have no attached electrical equipment, metal hinges are sufficient continuity· removing a part shall not interrupt the protective bonding for the remaining parts.verify8.2.4exclusion of switching devices from the protective bonding circuit· no fuses, switches, o

50、r current limiting8.2.5parts which need not be connected to the protective bonding circuit· cannot be grasped, or £ 50 mm x 50 mm in area, or located such that contact with live parts or insulation failure is unlikely8.2.6interruption of protective bonding circuit by connectors· prote

51、ctive earth is first to make, last to break· metallic bodies of connectors to be bonded to pe8.2.7protective conductor connecting points (see 15.1.1)· shall be secure against accidental loosening· only one conductor per one terminal connecting point· shall be identified with 417-

52、iec-5019 (the “pe” mark is reserved to use for the one terminal where the user connects the external protective conductor)8.3.1bonding to the protective bonding circuit for operational purposesthis refers to the practice of using the protective earth for control circuits, to reduce the chance of mal

53、operation in the event of an insulation failure. the following clauses teach methods.8.3.2bonding to the protective circuit· one side of control transformer secondary to protective earth, at the source of control circuit voltage.· (may have overcurrent protection in this leg, if conductor

54、is short and insulation failure is unlikely)· one side of operating coil (or lamp, or other control output) connected to protective earth· control contactor (push button or relay contact) between operating coil and the other side of the transformer secondary (see 9.1.4)· exposed condu

55、ctive parts of control contactors bonded to protective earth8.3.3bonding to a common reference potentiala low resistance conductor in a low impedance network may be used as a reference level for high frequency signals.- termination points to be identified with symbol 417-iec-5020bonding to a common

56、reference potential - the provision of a second terminal for connection to a “noiseless” earth is permitted- terminal to be identified with symbol 417-iec-50189.1control circuits9.1.1control circuit - supply· transformers shall be used to supply control circuits· (not required if £ 3k

57、w & single motor starter & £ 2 control devices - e.g. e-stop + interlock)· if multiple transformers, secondary voltages be in phase· if dc control voltage, must be from separate windings9.1.2control circuit voltages· shall be £ 277 v when supplied by a transformer9.1

58、.3protection· control circuits shall have overcurrent protection (see 7.2.4 & 10)9.1.4connection of control devices· control transformer secondary to pe - see 8.4 above - one side of operating devices (e.g. relay coils) also to pe· exception permitted if earth fault will not cause starting (e.g