B.21 Construction
B.21.101 For class I tools incorporating a motor supplied by a rectifier circuit, the d.c. circuit shall be
insulated from accessible parts of the tool by double insulation or reinforced insulation.
Compliance is checked by the tests specified for double insulation and reinforced insulation.
MARCH 26, 2004
CAN/CSA-C22.2 NO. 60745-1-04
♦
UL 60745-1
108
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
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B.28 Creepage distances, clearances and distances through insulation
B.28.1 The values specified in Table 10 do not apply to distances between live parts of the motor and its
other metal parts.
This is generated text for figtxt.
MARCH 26, 2004
CAN/CSA-C22.2 NO. 60745-1-04
♦
UL 60745-1
109
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
--````,```,`,`,``,`,,,,,,,``,,,-`-`,,`,,`,`,,`---
Components
— original connection
- – - short circuit
≈
open circuit
A short circuit of the terminals of the motor
B open circuit of the shunt resistor
C open circuit of the supply to the motor
Figure B.1 – Simulation of defects
MARCH 26, 2004
CAN/CSA-C22.2 NO. 60745-1-04
♦
UL 60745-1
110
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
--````,```,`,`,``,`,,,,,,,``,,,-`-`,,`,,`,`,,`---
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