The following information has been provided from an individual in Canada. (Users should verify that the information is still correct):-

CANADIAN WIRING METHODS COMPARISON CHART - Class I, Zone and Division System

 
 

CLASS I

CLASS I CLASS II CLASS II
WIRING METHOD ZONE 0 ZONE 1 ZONE 2 DIVISION 1 DIVISION 2 DIVISION 1 DIVISION 2 DIVISION 1 DIVISION 2

conduit

- intrinsically safe (i) or (ia)

 

18-090(3)

 

- threaded rigid metal conduit

18-106(1), with;

- five threads engaged for taper threads and straight threads used in Group IIA & IIB; or

- eight threads engaged for straight threads in Group IIC

 

- threaded rigid metal conduit

18-156(1)(a), with;

- five threads engaged for taper threads and straight threads used in Group IIA & IIB; or

- eight threads engaged for straight threads in Group IIC

- threaded rigid metal conduit with five threads engaged

 

J18-104(1) & (3)

 

- threaded metal conduit with three threads engaged

 

J18-152(1)(a)

 

- threaded rigid metal conduit with three threads engaged

 

18-202(1) & 12-1008

 

- threaded metal conduit with three threads engaged

 

18-252(1)(a) & 12-1008

 

- threaded rigid metal conduit with three threads engaged

- electrical metallic tubing (EMT)

 

18-302(1)

 

- same as Class III, Division 1

 

18-352

 

cable

- intrinsically safe (i) or (ia)

 

18-090(3)

 - cables approved for Class I,

Zone 1

 

18-106(1)

 1. - cables approved for Class I,

Zone 2

18-156(1)(b)

2. - TC cable installed in cable tray

18-156(1)(c)

3. - ACWU cable

18-156(1)(d)

4. - ACIC cable

18-156(1)(e)

5. - CIC cable installed in cable tray - where cable voltage

£ 300V, & circuit voltage ≥150V, & circuit current ≥5A

18-156(1)(f)

 - cables approved for Class I, Division 1

 

J18-104(1)

 1. - cables approved for Class I, Division 2

J18-156(1)(b)

2. - TC cable installed in cable tray

18-156(1)(c)

3. - ACWU cable

J18-156(1)(d)

4. - ACIC cable

J18-156(1)(e)

5. - CIC cable installed in cable tray where: (a) cable voltage £ 300V, & (b) circuit voltage ≥150V, & (c) circuit current ≥5A

J18-156(1)(f)

 - cables approved for Class II, Division 1

 

18-202(1)

 1. - cables approved for Class II, Division 2

18-252(1)(b)

 2. - TC cable installed in cable tray

18-252(1)(c)

3. - ACWU cable

18-252(1)(d)

4. - ACIC cable

18-252(1)(e)

 

 - cables approved for Class III, Division 1

 

18-302(1)

1. - cables approved for Class III, Division 2

2. - open wiring on insulators maybe used provided the section, compartment, or area is used only for storage containing no machinery and not installed in roof spaces and protected from physical damage see Rules 12-202 - 12-224

18-352

 flexible connection

 - intrinsically safe (i) or (ia)

 18-090(3)

 - approved for location

(ie: explosion-proof flex)

 18-106(7)

 - flexible metal conduit

18-156(6)

- approved for location

(ie: explosion-proof flex)

 J18-104(5)

 - flexible metal conduit

 J18-156(3)

 - liquid-tight flexible conduit

- extra-hard-usage cord

 18-202(4)

 - liquid-tight flexible conduit

- extra-hard-usage cord

18-252(4)

 - liquid-tight flexible conduit

- extra-hard-usage cord

 18-302(4)

 - liquid-tight flexible conduit

- extra-hard-usage cord

 18-352

 

LOCATION OF SEALS (Sealing Fittings) IN HAZARDOUS LOCATIONS

CLASS I, ZONE 1 & 2 and DIVISION 1 & DIVISION 2

In conduit systems:  

- as close as practicable to the enclosure required to be sealed

- maximum distance from enclosure required to be sealed is 450 mm

- no junction box or similar enclosure between the sealing fitting and the enclosure required to be sealed: (EXCEPTION AN APPROVED UNION)

In cable systems:

- at the termination of the cable at the cable gland at the enclosure when a seal is required

CLASS II, DIVISION 1 and 2

In raceway systems:

- to prevent dust from entering the dust-tight enclosure

- permanent and effective seal

- horizontal section of raceway not less than 3 m long before it enters the enclosure to be sealed or cross the boundary

- vertical section of raceway not less than 1.5 m long extending downwards from the enclosure required to be sealed or the boundary

SEALS AT BOUNDARIES

- the sealing fitting must be accessible

- no fitting, coupling, junction box or similar enclosure between the sealing fitting and the boundary

- the CE Code doesnít specify which side of the boundary they are to be installed on.

NOTE:  The standard practice is to place all seals required at a boundary on the same side of the boundary.

SEALING COMPARISON CHART - Class I, Zone and Division System

 

CLASS I

CLASS I CLASS II CLASS II
WIRING METHOD ZONE 0 ZONE 1 ZONE 2 DIVISION 1 DIVISION 2 DIVISION 1 DIVISION 2 DIVISION 1 DIVISION 2

conduit

- leaves the Class I, Zone 0 location

 

1. - enters an enclosure for switches, circuit breakers, fuses, relays, resistors, or other apparatus which may produces arcs, sparks, or high temperature

2. - 53 (2) or larger and enters an enclosure for terminals, splices or taps

3. - leaves a Class I, Zone 1 area

4. - enters an enclosure not required to be explosion-proof or flame-proof

1. - enters an enclosure required to be explosion-proof or flame-proof

2. - leaves a Class I, Zone 2 area

1. - enters an enclosure for switches, circuit breakers, fuses, relays, resistors, or other apparatus which may produces arcs, sparks, or high temperature

2. - 53 (2) or larger and enters an enclosure for terminals, splices or taps

3. - leaves a Class I, Division 1 area

 

1. - enters an enclosure required to be explosion-proof

2. - leaves a Class I, Division 2 area

- provides communication between an enclosure required to be dust-tight and one that isnít

 

- same as Class II, Division 1

 

- none required

 

- none required

 

cable

- first point of termination in the Class I, Zone 0 location

 1. - enters an enclosure required to be explosion-proof or flame-proof

2. - enters an enclosure not required to be explosion-proof or flame-proof and cable leaves the Zone 1 area and:

(a)  is less than

10 m in length; or

(b) the equipment/

devices in the enclosure can be subject to a hazardous gas/vapour in excess of 1.5 kPa; or

(c) one end of the cable terminates in a Zone 2 or non-hazardous location where a negative pressure greater than 0.2 kPa exists

3. - non -continuous sheathed cables at the boundary of the Zone1 area

1. - enters an enclosure required to be explosion-proof or flame-proof

2. - enters an enclosure not required to be explosion-proof or flame-proof and cable leaves the Zone 1 area and:

(a) is less than 10 m in length; or

(b) the equipment/ devices in the enclosure can be subject to a hazardous gas/vapour in excess of 1.5 kPa; or

(c) one end of the cable terminates in a  non-hazardous location where a negative pressure greater than 0.2 kPa exists

3. - non -continuous sheathed cables at the boundary

 

 1. - enters an enclosure required to be explosion-proof or flame-proof

2. -non -continuous sheathed cables at the boundary

 

J18-106(3)(c) & (6)

 1. - enters an enclosure required to be explosion-proof or flame-proof

2. - enters an enclosure not required to be explosion-proof or flame-proof and cable leaves the Division 1 area and:

(a) is less than 10 m in length; or

(b) the equipment/ devices in the enclosure can be subject to a hazardous gas/vapour in excess of 1.5 kPa; or

(c) one end of the cable terminates in non-hazardous location where a negative pressure greater than 0.2 kPa exists

3. - non -continuous sheathed cables at the boundary

- none required

 - none required

 

- none  required

- none required


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Updated Mar. 26, 2004