Summary of Topics This is the Third edition of ansi/ul 60745-1, the Standard for Safety for Hand-Held Motor- operated Electric Tools – Safety – Part 1: General Requirements and is based on iec 60745-1

MARCH 26, 2004
CAN/CSA-C22.2 NO. 60745-1-04
♦
UL 60745-1
88
Copyright Underwriters Laboratories Inc. 
Provided by IHS under license with UL
Licensee=CSA Group/5934117001, User=YUEN, Ruby
Not for Resale, 12/21/2004 21:51:39 MST
No reproduction or networking permitted without license from IHS
--````,```,`,`,``,`,,,,,,,``,,,-`-`,,`,,`,`,,`---

---

Table 10 – Minimum creepage distances and clearances (in millimetres)
Distances
Class III tools
Other tools
Working voltage
Working voltage
Working voltage
≤
130 V
>130 V and
≤
250
V
>250 V and
≤
440
V
mm
Creepage
distance
Clear-
ance
Creepage
distance
Clear-
ance
Creepage
distance
Clear-
ance
Creepage
distance
Clear-
ance
Between live parts of different polarity
1)
:
– if protected against deposition of dirt
2)
1,0
1,0
1,0
1,0
2,0
2,0
2,0
2,0
– if not protected against deposition of dirt
2,0
1,5
2,0
1,5
3,0
2,5
4,0
3,0
– if lacquered or enamelled windings
1,0
1,0
1,5
1,5
2,0
2,0
3,0
3,0
– for positive temperature coefficient (PTC)
resistors including their connecting wires, if
protected against deposition of moisture or
dirt
2)
–
–
1,0
1,0
1,0
1,0
–
–
Between live parts and other metal parts over
basic insulation:
– if protected against deposition of dirt
2)
• if of ceramic material, pure mica and
the like
1,0
1,0
1,0
1,0
2,5
3)
2,5
3)
–
–
• if of other material
1,5
1,0
1,5
1,0
3,0
2,5
3)
–
–
– if not protected against deposition of dirt
2,0
1,5
2,0
1,5
4,0
3,0
–
–
– if the live parts are lacquered or enamelled
windings
1,0
1,0
1,5
1,5
2,0
2,0
–
–
– at the end of tubular sheathed-type heating
elements
–
–
1,0
1,0
1,0
5)
1,0
4)
–
–
Between live parts and other metal parts over
reinforced insulation:
– if the live parts are lacquered or enamelled
windings
–
–
6,0
6,0
6,0
6,0
–
–
– for other live parts
–
–
8,0
8,0
8,0
8,0
–
–
Between metal parts separated by
supplementary insulation
–
–
4,0
4,0
4,0
4,0
–
–
1)
The clearances specified do not apply to the air gap between the contacts of thermal controls, overload protection devices,
switches of micro-gap construction, and the like, or to the air gap between the current-carrying members of such devices where
the clearance varies with the movement of the contacts.
2)
In general, the interior of a tool having a reasonably dust-proof enclosure is considered to be protected against deposition of
dirt; provided the tool does not generate dust within itself, hermetic sealing is not required.
3)
If the parts are rigid and located by mouldings, or if the design is such that there is no likelihood of a distance being reduced
by distortion or movement of the parts, this value may be reduced to 2,0 mm.
4)
If protected against deposition of dirt.
5)
If over ceramic, pure mica and the like, protected against deposition of dirt.