grounding burgler alarm cabinets

[boatfull]

if a transformer is attached to a receptacle and just the 24volts are brought into a metal alarm cabinet, does it require grounding?
thanks

 

[barbeer]

Not IMHO, if a phone line is attached a surge arrester should be used on it which would be more effective with a ground point.

 

[Pierre C Belarge]

Take a look at 250.20 and 250.22 for grounding of the circuit you are speaking of.

 

[brantmacga]

i think all the alarm cabinets i've installed specified a separate EGC connected to the cabinet.

 

[tom baker]

The alarm circuit does not require grounding (see 250.20 and exceptions), but the mfg may want the cabinet "grounded" for lightning protection.

 

[brantmacga]

but the mfg may want the cabinet "grounded" for lightning protection.

yes, that is what i meant by "specified".