What type of jacket is commonly used for riser cables to meet building safety regulations?

The correct response is that riser cables typically utilize a Low Smoke Zero Halogen (LSZH) jacket to meet building safety regulations. LSZH materials are specifically designed to emit minimal smoke and low levels of toxic gases when exposed to fire, making them safe for indoor environments, particularly in vertical spaces like riser conduits where multiple cabling systems may be present. This characteristic is crucial for ensuring safety during emergencies, as it reduces the risk of smoke inhalation and allows for better visibility in the event of a fire.

Other options, while they may have their applications in specific scenarios, do not meet the particular requirements set for riser cables. For example, PVC insulation is often used in various applications due to its durability and cost-effectiveness; however, it can produce significant smoke and toxic fumes when burned. Gel-filled jackets are primarily used for outdoor or underground cables to protect against moisture and environmental damage but do not cater specifically to the safety needs required in riser installations. Heavy-duty waterproof materials are also intended for outdoor use to shield cables from wet conditions, which is not the primary concern for cables installed in vertical spaces within buildings.