Fiber Optic Installation Safety

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Presentation transcript:

Fiber Optic Installation Safety Ch 11 Fiber Optics Technician’s Manual, 3rd. Ed Jim Hayes

Bare Fiber Safety If the shards get into your skin, you will have to wait for them to work out Wear eye protection! Put shards on sticky tape Account for all shards

Eye Safety (Laser Damage) Most sources are low-power and no great risk High power sources might burn the retina with invisible light Images from tsogalveston.com and chppm-www.apgea.army.mil (Links Ch 11c-e)

Eye Safety Rules Never look into the end of a cable that might be in use Cap unused connectors Tape unterminated fiber ends Mark enclosures with warning labels Laser test sources are dangerous, don’t leave them lying around

Chemical Safety MSDS: Material Safety Data Sheet – a document that lists the risks of a chemical Alcohol – flammable Adhesives – irritate skin, require ventilation Index matching gel – irritate eyes Silicone adhesives like RTV are used as mechanical sealant – can irritate skin or eyes

UV Light Sources Used to cure some adhesives Harmful to eyes Causes skin cancer

Canned Compressed Air Can explode if heated or damaged Some use flammable propellant

Gas in Manholes There may be no oxygen in the hole Working Alone – test the space first Working as a Crew One worker in the hole, wearing a harness One above hole Image from cpchem.com (Link Ch 11a)

Tools and Equipment Step Ladders Extension Ladders Don’t stand on top step Must be in good repair Extension Ladders Must reach three feet beyond bearing point Angle: 1 foot of spacing for every 3 or 4 feet of height

Tools and Equipment Knives Syringes and Needles Microscopes Hook blade is most common Cut away from yourself Syringes and Needles They are blunt and not a medical hazard Microscopes Use a power meter first to make sure there is no light coming out of the fiber

Tools and Equipment Cable Installation Equipment Toolbox Trenchers, backhoes, boring machines Obvious big-equipment hazards Toolbox Have a container for spare knife blades Prevent liquid spills, battery shorts, etc.

Personal Safety Equipment Gloves protect you from Corrugated armor sheaths Fiberglass splinters Safety Glasses

Safe Working Area Enough table space Good Lighting Don’t eat or drink in work area Prevent falls – loose cables, open holes Clean work area after you are done, properly dispose of all shards

Safe Working Area Aerial Installation Hazards Weather Ladder safety Electric power lines Weather Employee Training

Planning the Installation Ch 12 Fiber Optics Technician’s Manual, 3rd. Ed Jim Hayes

Why is Planning Necessary? Construction is not repetitive Each job is different By the time you perfect your procedure, it’s time for the next job You must avoid mistakes through planning

Measuring for Conduit Pulls Avoid unneeded splices – they lose signal and cost time and money Measuring from prints Inaccurate, so you waste cable With a Wheel On-Site Much more accurate Measurement/Pull Tape Most accurate

Measuring Wheel Image from englo.ee (link Ch 11g)

Measurement/Pull Tape Image from arncocorp.com (Link Ch 11f)

Extra Length Leave 7 to 10 feet extra for termination Access or repair coils are needed Michigan State U. required 30 feet extra cable in conduit at each termination point (link Ch 11h) Allow 1% extra length outside Allow 5% - 7% extra length inside

Splicing Fusion splicing cannot be done in manholes So 30 feet slack needed on each side of the splice (60 feet extra cable) Mechanical splices can be done in manholes Only 10 feet of extra cable needed

Efficient Pulling If a pull is too long, the tension will grow too high Break up the pull with figure-eighting in locations with enough room Don’t leave reels of cable unprotected Cable can cost thousands of dollars

Duct Space Large ducts are divided by innerduct Protects the fiber cable Reduces friction Image from store.cablesplususa.com (link Ch 11i)

Initial Planning Walkout Project Engineer Knows customer’s needs Lead Technician An experienced fiber installer Project Superintendent Must coordinate activities of workers All obstacles should be found and planned for, so crews don’t sit idle waiting during the job