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Scope

1.1 Scope. 1.1.1 This standard applies to purging and pressurizing for the following:
(1) Electrical equipment located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70 (2) Electrical equipment containing sources of flammable vapors or gases and located in either classified or unclassified areas
(3) Control rooms or buildings located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70
(4) Analyzer rooms containing sources of flammable vapors or gases and located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70 1.1.2.

This standard does not apply to electrical equipment located in:
(1) Areas classified as Class I, Zone 0
(2) Areas classified as Class III
(3) Areas where flammable liquids may be splashed or spilled on the electrical equipment.

Notes

Claudia's Notes:
This new edition provides the following changes:

Revisions to the definitions for Type X Pressurizing, Type Y Pressurizing, and Type Z Pressurizing clarify that pressurizing keeps a flammable atmosphere around a protected enclosure from entering an enclosure, which enables the use of either ignition-capable equipment (in Type X Pressurizing or Type Z Pressurizing) or Division 2 or Zone 2 equipment (Type Y Pressurizing) inside an enclosure.

The addition of a new requirement affecting electrical alarm actuators in Type Y Pressurizing to require them to be identified for a Division 1 or Zone 1 location.

Clarification of requirements affecting cutoff switch actuators in Type X Pressurizing.

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