IEC / UL 61010 is the internationally harmonized safety standard for Laboratory, Test & Measurement and Process Control equipment.

1. UL61010-1 and -2-030
U.S. National Differences
UL Staff
Prepared: August 2012
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2. Agenda
National Differences for:
• Risk of Electric Shock
• Risk of Fire
• Protection Against Hazards from Fluids
• Components and Subassemblies
• Measuring Circuits
• Annexes
Slide 2
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3. Permissible Limits for Accessible Parts
Normal Condition (6.3.1)
• Voltage Levels
US National Differences (to be in
IEC 61010-1 3rd Edition the North American Harmonized
Standard)
33 V rms 30 V rms
46.7 V peak 42.4 V peak
70 V dc 60 V dc
3

4. Permissible Limits for Accessible Parts
Single Fault Condition (6.3.2) Continued
IEC 61010-1 3nd Edition National Differences
55 V rms 50 V rms
78 V peak 70 V peak
140 V dc 120 V dc
Note: Sub-clauses 6.3.2 A
4

5. Figure 2DV - Maximum duration of short-term ACCESSIBLE
voltages in SINGLE FAULT CONDITION (see 6.3.2 a))
Key
A a.c. voltage level in WET LOCATIONS C d.c. voltage level in WET LOCATIONS
B a.c. voltage level in dry locations D d.c. voltage level in dry locations

6. National Difference – Protective Conductor
Impedance
6.5.2.4DV D2 Modification by replacing the text and the conformity
statement with the following:
• IEC – states 0.1 Ω, for non-detachable power cord 0.2 Ω.
• The impedance between the PROTECTIVE CONDUCTOR
TERMINAL and each ACCESSIBLE part for which PROTECTIVE
BONDING is specified shall not cause a potential drop of more than
4 V.
• IEC - Conformity is checked by applying a test current for 1 min and
then calculating impedance. The test current is the greater of
a) 25 A a.c. r.m.s. at RATED MAINS frequency or d.c.,
b) a current equal to twice the RATED current of the equipment
• Conformity is checked by inspection and by applying an a.c. test
current for the duration specified in Table 6.5.2.4DV.1 and then
measuring the voltage drop. See 4.4.4.3 for test conditions regarding
the spread of fire.
• . UL and the UL logo are trademarks of UL LLC © 2012
6

7. National Difference – Protective Conductor
Impedance Continued
• The test current is twice the rating of the attachment plug cap, but
not less than 40 A.
• If the equipment contains overcurrent protection devices for all poles
of the MAINS supply, and if the wiring on the supply side of the
overcurrent protection devices cannot become connected to
ACCESSIBLE conductive parts in the case of a single fault, the test
current need not be more than twice the RATED current of the
internal overcurrent protection devices.
• If the test current exceeds 500 A, see CSA 0.4.
7

8. National Difference – Table 6.5.2.4DV.1 -
Duration of Protective Bonding Test
Table 6.5.2.4DV.1 – Duration of protective bonding test
8
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9. National Difference – Protective Bonding
impedance Conformity Statement
6.5.2.5DV D2 Modification:
• IEC - Conformity is checked by applying a test current of twice the
value of the overcurrent protection means specified in the equipment
installation instructions for the building supply MAINS CIRCUIT for 1
min between the PROTECTIVE CONDUCTOR TERMINAL and
each ACCESSIBLE conductive part for which PROTECTIVE
BONDING is required. The voltage between them shall not exceed
10 V a.c. r.m.s. or d.c.
• In the first sentence of the conformity statement, replace “1 min” with
“the duration specified in Table 6.5.2.4DV.1”.
• In the second sentence of the conformity statement, replace “10 V”
with “4 V”.
9

10. National Difference - Connection to the MAINS supply
source and connections between parts of equipment
• IEC - 6.10.1 MAINS supply cords
The following requirements apply to non-detachable MAINS supply cords and to
detachable MAINS supply cords supplied with the equipment.
• Cords shall be RATED for the maximum current for the equipment and the cable
used shall meet the requirements of IEC 60227 or IEC 60245.
ND - 6.10.1DV.1 Delete the reference to the requirements of IEC 60227 or IEC
60245 for MAINS supply cords in the second paragraph
• If a cord is likely to contact hot external parts of the equipment, it shall be made
of suitably heat-resistant material.
• If the cord is detachable, both the cord and the appliance inlet shall have
adequate temperature RATINGS.
• Conductors coloured green-and-yellow shall be used only for connection to
PROTECTIVE CONDUCTOR TERMINALS.
6.10.1DV.2 Replace the fifth paragraph with the following:
ND - Green covered conductors (with or without yellow stripes) shall be used
only for connection to PROTECTIVE CONDUCTOR TERMINALS
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11. National Difference - Connection to the MAINS supply
source and connections between parts of equipment
Detachable MAINS supply cords with MAINS connectors according to IEC 60320 shall
either meet the requirements of IEC 60799, or shall be RATED at least for the current
RATING of the MAINS connector fitted to the cord.
ND - 6.10.1DV.3 Delete the reference to the requirements of IEC 60799 for
detachable MAINS supply cords in the sixth paragraph.
ND - 6.10.1DV.4 Add the following paragraphs and new note after the sixth
paragraph:
ND - Requirements for MAINS cords or cord sets are contained in ANSI/UL 817 and
CSA C22.2 No. 21.
ND - Requirements for general use receptacles, attachment plugs, and similar
wiring devices are contained in ANSI/UL 498 and CSA C22.2 No. 42, CSA C22.2 No.
182.1, CSA C22.2 No. 182.2, and CSA C22.2 No. 182.3.
ND - NOTE This subclause only applies to cords connected to the external fixed
MAINS socket-outlet and to external interconnecting mains cords. This subclause
does not apply to cords fully contained within the equipment enclosure
• Figure 9 explains the terminology for MAINS supply cords.
• Conformity is checked by inspection and, where necessary, by measurement.
11

12. National Difference - 6.10.4DV.1 PERMANENTLY CONNECTED
EQUIPMENT
• Addition of a new clause
• Equipment intended for permanent connection to the MAINS
shall meet the requirements of Annex DVD.
• Conformity is checked as specified in Annex DVD.

13. National Difference – 6.11 Title Modification
• 6.11 Disconnection from supply source
• 6.11DV D2 Modification of the title: Add “and maintaining polarity” to
the end of the subclause title.
13

14. National Difference – 6.11.5DV D2 Polarity of
MAINS Connections
ND - 6.11.5DV D2 Addition of a new sub-clause for Polarity of
Connections to the MAINS Circuit:
• Any line-connected single-pole switch, any center contact of a lamp
holder, and any automatic control with a marked off position shall be
connected to a TERMINAL or lead intended for connection to the
ungrounded conductor of the supply circuit.
NOTE An “ungrounded” supply conductor is one that is not
connected to protective earth at any point in the building installation.
14

15. • National Difference – 9.6.1. ADV Connection
of overcurrent protective devices
Added the following for connections of overcurrent protective devices
• 9.6.1ADV.1 A single-pole circuit breaker must be connected to the
ungrounded supply conductor
• 9.6.1ADV.2 A multiple-pole circuit breaker must interrupt the neutral
(grounded) and ungrounded conductors simultaneously.
• 9.6.1ADV.3 A single fuse must be in the ungrounded conductor.
• 9.6.1ADV.4 Fuses used in both the neutral (grounded) and
ungrounded supply conductors must be adjacent with same ratings
and characteristics.
• 9.6.1ADV.5 Screw shell of a plug fuseholder and accessible contact
of an extractor type fuseholder when:
• Located in the Ungrounded supply conductor: shall be connected towards
the load.
• Located in the Neutral conductor: the shell shall be connected towards the
neutral supply line.
15

16. • National Difference – 11.7.1. DV max.
Pressure, referencing Annex G as normative
for certain types
• 11.7.1DV.1 Laboratory and Testing and Measurement equipment
having both of the following characteristics shall meet the
requirements of 11.7.2 and G.5:
a) a product of pressure and volume greater than 200 kPa·l,
b) a pressure .greater than 50 kPa.
• 11.7.1DV.2 Laboratory equipment and testing and measurement
equipment that do not have those characteristics shall meet the
requirements of 11.7.3 and 11.7.4, as applicable.
• 11.7.1DV.3 Process Control and other equipment shall meet the
requirements of Annex G, as applicable
16

17. • National Difference – Leakage and Rupture at
High Pressure11.7.2. DV Replacing Note as
follows:
• Fluid-containing parts which in NORMAL USE have both of the
following characteristics shall not cause a HAZARD through rupture
or leakage:
a) a product of pressure and volume greater than 200 kPa·l;
b) a pressure greater than 50 kPa.
Conformity is checked by inspection and, if a HAZARD could arise, by the
described hydraulic test
• NOTE National authorities may allow safety to be established by
calculation, for example according to the ASME Boiler and Pressure
Vessel Code.
17

18. National Difference – 14.1 Components and
Subassemblies North American Standards
• a) applicable safety requirements of a relevant IEC standard …
• b) the requirements of this standard and, where necessary for the
application, any additional applicable safety requirements of the
relevant IEC component standard, …
• c) if there is no relevant IEC standard, the requirements of this
standard;
• d) applicable safety requirements of a non-IEC standard which are at
least as high as those of the relevant IEC standard, provided that the
component has been approved to the non- IEC standard by a
recognized testing authority.
ND – In all these sub-clauses ), replace “IEC” with “ANSI, CAN, CSA,
IEC, ISO, or UL”.
ND - . Add a new note 3:
• NOTE 3: Annex DVA provides applicable safety requirements.
18

19. National Difference – 14.7 Printed Wiring
Boards North American Flammability
Printed wiring boards shall be made of material with a flammability
classification of V-1 or better of IEC 60695-11-10.
ND - 14.7DV D2 Addition of the following to the end of the first
paragraph:
• A flammability RATING of ANSI/UL V-1 or CAN/CSA C22.2 No. 0.17
is considered equivalent to the same classification of IEC 60695-11-
10.
19

20. National Difference – 14.9 Outdoor Use
ND - 14.9DV D2 Add a new sub-clause to address enclosures intended
for outdoor use:
• Nonmetallic enclosures intended for outdoor use shall meet the UV
resistance requirements of ANSI/UL 746C or of CSA C22.2 No. 0.17,
or both as appropriate.
NOTE ANSI/UL 746C, clause 25, requires a 1 000 hour UV/water exposure
preconditioning using a xenon-arc or
• alternatively a 720 hour UV/water exposure preconditioning using
twin carbon arcs. CSA C22.2 No. 0.17, subclause 5.9, permits only
the 1 000 hour UV/water exposure preconditioning.
20

21. National Difference – 14.10 Conductive
Coatings
ND - 14.10DV D2 Add a new subclause to address conductive
coatings, shields, and tape:
• 14.10DV.1.1 The bond of a conductive (metallic) coating applied to a
polymeric part shall be evaluated.
• 14.10DV.1.2.
a) Evaluating the bond in accordance with the requirements for
“Adhesives” in ANSI/UL 746C and/or CSA C22.2 No. 0.17, or
b) Evaluating the product to determine that peeling or flaking of the
coating would not reduce spacings or bridge live parts so as to introduce a
risk of fire or electric shock.
.
21

22. National Difference – 14.10 Conductive Shields,
and Tape
14.10DV.2 Conductive shield or tape
• 14.10DV.2.1 If peeling of the conductive shield or tape may introduce
a RISK of fire or electric shock, the bond between a conductive
shield or tape and any other surface shall be investigated.
• 14.10DV.2.2 Conformity is checked by inspection
22

23. National Difference – 14.11 Direct Plug-in
Transformers North America Standards
• ND - Add a new sub-clause14.11DV D2
• 14.11DV.1 Direct plug-in transformer units:
• Direct plug-in transformer units are subject to additional
requirements found in ANSI/UL 1310, CAN/CSA C22.2 No. 223,
ANSI/UL 60950-1, or CSA C22.2 No. 60950-1, as applicable.
23

24. Measuring circuit TERMINALS
ND - Table 101DV DR Modify the values in Table 101 by replacing it with the
following:
Table 101DV - CLEARANCES and CREEPAGE DISTANCES for measuring circuit
TERMINALS with HAZARDOUS LIVE conductive parts (IEC Values in brackets)
Voltage on conductive parts of TERMINAL CLEARANCE and
CREEPAGE DISTANCE
V a.c. r.m.s. V d.c. mm
30 (33)  300 60 (70)  414 0,8
>300  600 >414  848 1,0
>600  1 000 >848  1 414 2,6
NOTE Values are determined by calculation for REINFORCED INSULATION. Transients are not taken into account.
Conformity is checked by inspection and measurement.

25. 101.3 Protection Against Mismatches of Inputs and
Ranges
ND - 101.3.3DV D2 Addition of the following test:
101.3.3DV.1 If the function or range controls have any effect on the
electrical characteristics of the input circuit, these controls shall
be changed to all possible settings while the input TERMINALS
are connected to the maximum RATED source.

26. Test leads for the tests of 101.3.2 and 101.3.3
101.3.4 …. If the manufacturer-supplied test leads are permanently
connected to the equipment, then the attached test leads supplied by
the manufacturer shall be used without modification.
ND - 101.3.4DV D2 Modification of 101.3.4 by deleting the following
paragraph
"If the manufacturer-supplied test leads are permanently
connected to the equipment, then the attached test leads
supplied by the manufacturer shall be used without
modification." and replacing it with the following:
101.3.4DV.1 The applicable tests of 101.3.2 and 101.3.3 shall be
performed with the test leads specified above and shall be
repeated with any test leads supplied with the equipment by
the manufacturer.

27. Annex DVA (informative) CSA, UL, IEC
component standards.
ND - DVA D2 Addition of a new annex DVA as follows:
• The following is a matrix that provides a cross-reference
between CSA, UL, and IEC standards for components.
• This cross-reference is not meant to imply that the standards
are equivalent. The CSA, UL, and IEC standards listed are used
for evaluation of components and features of products covered
by this standard.
• Components need only comply with the applicable component
standard acceptable in the country where the product is to be
used.
• These standards are considered to refer to the latest edition and
all revisions published to that edition.

28. Component Standards (Cont’d)

29. Component Standards (Cont’d)

30. Annex DVB (informative)
ND - DVB D2 Addition of a new annex DVB as follows
• A table indicating identifying all clauses that have a National
Difference

31. Annex DVC - (informative) - UV radiation limits: Guidelines from
the American Conference of Governmental Industrial Hygienists
(ACGIH)
• DVC D2 Addition of a new annex DVC for UV radiation limits
• DVC.1.1 These threshold limit values (TLVs) refer to ultraviolet (UV)
radiation in the spectral region between 180 and 400 nm and represent
conditions under which it is believed that nearly all workers may be
repeatedly exposed without adverse health effects.
• DVC.1.2 These values for exposure of the eye or the skin apply to UV
radiation from arc, gas, and vapor discharges, fluorescent and
incandescent sources, and solar radiation, but they do not apply to UV
lasers (see the TLV for lasers). These values do not apply to UV
radiation exposure of photosensitive individuals or of individuals
concomitantly exposed to photosensitizing agents. These exposures
to the eye do not apply to aphakics. (See light and near-infrared TLV for
radiation.) These values should be used as guides in the control of
exposure to continuous sources where the duration of exposure is not
less than 0,1 s. Likewise, these values should not be regarded as a fine
line between safe and dangerous levels.

32. Annex DVC - (informative) - UV radiation limits:Guidelines from
the American Conference of Governmental Industrial Hygienists
(ACGIH
• DVC.2 Recommended values
•
DVC.2.1 The TLVs for occupational exposure to UV radiation incident upon skin
or eye where irradiance values are known and exposure time is controlled are
as follows:
• a) UV-A (315 to 400 nm) radiation to the unprotected eye:
• 1) For exposure times less than 1 000 seconds, the total energy should not
exceed 1 J/cm2 (1 000 mJ/cm2).
• 2) For exposure times greater than 1 000 seconds, the average power level
should not exceed 1 mW/cm2; and no 1 000 second time period should present
a total energy that exceeds 1 J/cm2 (1 000 mJ/cm2).
• b) For monochromatic sources, the TLV for exposure to the unprotected skin
or eye is shown in Table DVC.2.1.1 (also represented in Figure DVC.2.1.1) and
should not be exceeded within an 8-hour period.
• c) For broad-spectrum or multi-peak sources, the TLV for exposure of the
unprotected skin or eye should be calculated based on an effective weighting
formula:
• Eeff = S (El • S l • Dl )

33. Annex DVD (normative) permanent connection
to MAINS
ND - DVD D2 Addition of a new Annex DVD as follows:
• DVD.1 General
• DVD.1.1 Equipment intended for permanent connection to the mains
shall have provision for connection of a wiring system in accordance
with ANSI/NFPA 70, NEC, with CSA C22.1, CEC, Part I, or with both as
appropriate, and shall meet the requirements of DVD.2 to DVD.3, as
applicable.
• DVD.1.2 Conformity is checked by inspection, and as specified in
DVD.2 to DVD.3.

34. Annex DVD (normative) permanent connection
to MAINS (Cont’d)
Topics Are:
DVD.2 Wiring TERMINALS and leads e.g.
• DVD.2.1.1 PERMANENTLY CONNECTED EQUIPMENT shall be provided
with TERMINALS or leads for the connection of conductors having an
ampacity that, in accordance with the National Electrical Code and/or the
Canadian Electrical Code, Part I, is acceptable for the equipment.
DVD.3 ENCLOSURE requirements for conduit entry e.g
• DVD.3.1 An ENCLOSURE shall not pull apart or sustain damage such as
cracking and breaking, and knockouts shall remain in place when
subjected to the pulling, torque, and bending that is likely to occur.
DVD.4 Conduit ENCLOSURE entry tests e.g.
• DVD.4.1 Conduit pull-out test
• DVD.4.2 Conduit torque test
• DVD.4.3 Bending
• DVD.4.4 Knockouts

35. Summary
National Differences for:
• Risk of Electric Shock
• Risk of Fire
• Protection Against Hazards from Fluids
• Components and Subassemblies
• Measuring Circuits
• Annexes
Slide 35

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