---
title: Externally Mounted Electrical Equipment
description: Electrical equipment mounted on the exterior of a pressurised enclosure must be explosion protected in accordance with the Zone (or EPL requirement) in which the enclosure is situated. Typical examples are pressure/flow rate sensors or switches which may use Ex…
url: "https://www.eicstech.com/kb/pressurisation-ex-p/basics-on-externally-mounted-electrical-equipment/"
updated: "2022-06-01"
category: Explosion Proof Basics / Pressurisation (Ex p)
---

# Externally Mounted Electrical Equipment

Electrical equipment mounted on the exterior of a pressurised enclosure must be explosion protected in accordance with the Zone (or EPL requirement) in which the enclosure is situated. Typical examples are pressure/flow rate sensors or switches which may use Ex I equipment, and junction boxes using Ex d, Ex e or Ex n methods of protection. This requirement also applies to the motor and starter of the fan which provides the flow of air, unless they are situated in a non-hazardous area (which is preferable).