Class 1 div 2

[Martin west]

Article 501.150 B 1-4
In a class 1 div 2 area where firealarm devices and low voltage ceiling occupancy sensors are installed . I need help with the following.
1.) are the devices required to be explosion proof
2.) are these circuits nonincendive ?

 

[petersonra]

Article 501.150 B 1-4
In a class 1 div 2 area where firealarm devices and low voltage ceiling occupancy sensors are installed . I need help with the following.
1.) are the devices required to be explosion proof
2.) are these circuits nonincendive ?

1 - generally not in a div 2 area.
2 - they are if UL or FM says they are.

Keep in mind that explosion proof means something very specific.

 

[rbalex]

Article 501.150 B 1-4
In a class 1 div 2 area where firealarm devices and low voltage ceiling occupancy sensors are installed . I need help with the following.
1.) are the devices required to be explosion proof
2.) are these circuits nonincendive ?

1.) Unless one of the Exceptions apply, devices covered by 501.150(B)(1) probably are. Although not likely, devices covered by 501.150(B)(2) may be.
2.) Not automatically. Nonincendive is a permissive wiring method but not a requirement nor an automatic application. Several inconvenient requirements apply if you choose to use it.

 

[petersonra]

1.) Unless one of the Exceptions apply, devices covered by 501.150(B)(1) probably are. Although not likely, devices covered by 501.150(B)(2) may be.
2.) Not automatically. Nonincendive is a permissive wiring method but not a requirement nor an automatic application. Several inconvenient requirements apply if you choose to use it.

do any of the devices he actually asked about come under 501.150(B)?

 

[rbalex]

do any of the devices he actually asked about come under 501.150(B)?

Donno; the OP's the one that asked. They may have contacts[(B)(1)], they almost certainly have resistors.[(B)(2)]. (B)(3)&(4) are irrelevant to the question.