API 500 and 505

[sambun]

Dear All,

Could any tell me the diference between API 500 and API 505 in terms of the following:

- Installation
- Equipment i.e. explosion proof and Instricsically Safe
- Advantage and Disadvantage
- Cost for equipment and installation
- Safety and reliability

Rgds,
Nutchap

Totally same. But :
API 500 Recommended Practice for Classification of Locations for Electrical Installations lnstallations at Petroleum Facilities Classified as Class 1 Div 1 Div 2
API 505-1998 RP Classification of locations for electrical installation lnstallations at Petroleum Facilities Classified as Class 1 Zone 0 to 2