An explosion proof electrical system comprises a rigid outer casing (2), withat least one rigid internal wall (4, 5) dividing the inside of the casing (2)into at least two chambers (3). Adjacent chambers (3) communicate via anaperture (7), with electrical equipment (8) being contained in each chamber(3). The electrical equipment (8) is interconnected via electrical connections(10) passing through the or each aperture (7). The outer casing (2) and the oreach rigid internal walls (4, 5) are made of a substantially non-conductivematerial, or of a conductive material in which case the casing and/or wallsis/are coupled to ground potential.
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