Single compression uses one elastomer seal to both grip and seal the cable; double compression splits those duties across two seals. Here is where the difference decides an installation.
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How to size an SWA cable gland from the cable itself: the three dimensions that set the inner seal, armour clamp and outer seal, why the same thread has two variants, and how to avoid the wrong-part order.
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An armoured cable gland must grip the armour, bond it to earth and seal the sheath. This guide covers armour types, BW / CW / E1W sealing stages, and how two cable diameters set the gland size.
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How to select hazardous area cable glands: read the classification drawing and enclosure certificate first, then match sealing method, cable range, material and IP to your process.
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Zone 1 and Zone 2 cable glands are selected from the area classification, not the catalogue. See how the zone sets the minimum EPL, what the gland marking must show, and the mistakes to avoid.
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Ex d and Ex e cable glands are not interchangeable: the protection concept comes from the enclosure, not the zone. Compare flame path design, internal sealing and cable entry consequences.
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