company news about Installation specification of Fiber Optic Closure

Aerial Installation: Mount on poles or messenger cables, ensuring a minimum height of 5 meters above ground.

Underground/Burial: Install in handholes or direct burial (minimum depth 0.8–1.2 meters, below frost line if applicable).

Indoor/Wall-Mounted: Ensure proper ventilation and protection from physical damage.

1.2 Tools & Materials

Fiber optic closure (matched to cable type: straight-through, branch, dome, or horizontal type)

Fusion splicer, OTDR, fiber cleaver

Heat shrink tubing, sealing tape, waterproof gel

Cable ties, fiber trays, grounding wire

Alcohol wipes, lint-free cleaning cloths

1.3 Cable Preparation

Strip cable jacket carefully without damaging fibers.

Clean and remove excess filling compound (if present).

Leave sufficient fiber length (≥1.5m) for splicing and storage.

2. Installation Steps

2.1 Mounting the Closure

Aerial: Secure with stainless steel straps to prevent movement.

Buried: Place in a protective vault or use a reinforced closure for direct burial.

Pole/Wall-Mounted: Ensure brackets are corrosion-resistant.

2.2 Cable Entry & Fixation

Use grommets/sealing clamps to prevent cable slippage and moisture ingress.

Secure strength members (aramid yarn/steel wire) to the closure’s anchoring points.

Maintain bend radius ≥20× cable diameter (static) or ≥10× (during installation).

2.3 Fiber Splicing & Storage

Perform fusion splicing with loss ≤0.05dB (single-mode) or ≤0.3dB (multi-mode).

Arrange spliced fibers neatly in trays, ensuring bend radius ≥30mm.

Avoid tight bends or sharp twists that cause micro-bending losses.

2.4 Sealing & Protection

Apply waterproof gel or butyl rubber around cable entry points.

Use heat-shrink tubing or self-amalgamating tape for airtight sealing.

For buried closures, ensure double-layer waterproofing (inner seal + outer mechanical protection).

2.5 Grounding (if applicable)

Metallic closures or armored cables must be grounded (resistance ≤5Ω).

Use copper grounding wire connected to a proper earth rod.

3. Post-Installation Testing & Documentation

3.1 Performance Verification

OTDR testing to confirm splice loss and overall link performance.

Continuity check using a visual fault locator (VFL).

Sealing test (pressure test for buried closures or water immersion check).

3.2 Labeling & Records

Mark closure with unique ID, cable IDs, splice dates.

Document splice loss values, fiber map, and GPS coordinates (for OSP installations).