Weryfikacja rozdzielnicy wg IEC 61439: Próba dielektryczna, nagrzewanie i odporność na zwarcia

Lista kontrolna oględzin — kluczowe pozycje

Busbar torque values (verify with torque wrench):
  M6 bolt:  6 Nm
  M8 bolt:  12 Nm
  M10 bolt: 25 Nm

Wire colour compliance (IEC 60446):
  Line conductors (L1/L2/L3): brown / black / grey
  Neutral (N):                 blue
  Protective earth (PE):       green-yellow striped
  KNX bus (TP):                red (+) / black (−)

DIN-rail components:
  Spring clip fully engaged on DIN rail
  No MCB rocking or lateral play
  Cable gland sealing inserts fitted (IP rating preservation)

KNX PS640 power supply:
  Output polarity verified (+ = red terminal, − = black)
  Bus voltage measured: 29V DC nominal (range 21–30V)
  Current load documented and within PS640 640mA rating

Procedura próby dielektrycznej

Test voltage selection:
  Assemblies rated ≤ 300V (typical 230/400V panels):
    Test voltage = 2 × rated voltage + 1000V
    Example: 2 × 230V + 1000V = 1460V → apply 1500V AC

  Alternative for assemblies with embedded electronics:
    500V DC (disconnect all sensitive devices first)

Instrument: hipot tester (e.g. Megger MIT400-EN high voltage,
  Seaward Apollo 600PAT, or equivalent)

Pre-test preparation:
  1. Open all outgoing MCBs and RCBOs
  2. Disconnect all sensitive electronics:
     - KNX PS640 and all KNX devices
     - DALI drivers, LED power supplies
     - Variable speed drives, UPS modules
     - Any device with semiconductor input filtering
  3. Short all outgoing conductors (L, N) to PE at the
     panel incomer — test voltage applied between
     the L+N+PE shorted group and the enclosure

Test application:
  Apply test voltage for 1 second (AC) or 1 minute (DC)

Pass criteria:
  No dielectric breakdown (no arc, flash, or trip of tester)
  Leakage current < 30mA at 1000V AC test voltage

Procedura termografii

Instrument: FLIR E8 Pro, Testo 875, or equivalent
  Resolution: ≥160×120 thermal pixels minimum
  Temperature accuracy: ±2°C or ±2%

Load condition for thermography:
  Load panel to 80% rated current (or full rated if available)
  Stabilise for minimum 30 minutes before measurement
  Measure: all busbar runs, all terminal blocks, incomer

Record for each measurement point:
  Location (busbar label, terminal reference)
  Ambient temperature (°C)
  Measured surface temperature (°C)
  Temperature rise = measured − ambient (K)
  Limit exceeded? Y/N

If hot spot found (temperature rise > limit):
  Identify cause: under-torqued connection, undersized busbar,
  inadequate ventilation, or component fault
  Rectify and retest before issuing routine verification cert

Sprawdzenie koordynacji SCPD

Step 1 — Measure PSCC at incomer terminals:
  Instrument: PFC (prospective fault current) tester
  e.g. Megger MFT1741 PFC function, Fluke 1662 PFC mode
  Measure: line-to-line AND line-to-neutral PSCC
  Use higher value (worst case)

Step 2 — Verify SCPD breaking capacity ≥ PSCC:
  Example: PSCC measured = 6 kA at incomer
  Incomer MCB: Schneider iC60N 63A, breaking capacity = 6 kA
  Result: 6 kA ≥ 6 kA → marginally acceptable

  Recommended: select SCPD with breaking capacity > PSCC
  to allow for supply PSCC increase over service life

  If PSCC > MCB breaking capacity:
  Option 1: Upgrade to higher breaking capacity MCB
            (e.g. iC60H = 10 kA, iC60L = 15 kA)
  Option 2: Install upstream HRC fuse to limit PSCC
            (current-limiting fuse reduces let-through energy)

Step 3 — Verify panel ISCC ≥ PSCC:
  Panel nameplate ISCC must equal or exceed measured PSCC.
  If PSCC > panel ISCC: panel is not rated for the installation
  → specify higher rated panel or install upstream limitation

Obliczenie przekroju szyn zbiorczych

Standard copper busbar current density:
  Enclosed panel (limited ventilation): 1.2 A/mm²
  Open air (well ventilated):           1.5 A/mm²

Sizing example — 63A main busbar in enclosed panel:
  Required cross-section = 63A ÷ 1.2 A/mm² = 52.5 mm²
  Select: 50 × 3 mm flat copper bar = 150 mm² → ✓ adequate
  Verify: 150 mm² × 1.2 A/mm² = 180A rating → 63A load is fine

Alternative: check manufacturer rating table for busbar profile
  (accounts for skin effect at high current, surface emissivity)

Common busbar profiles for distribution panels:
  12 × 2 mm   = 24 mm²  = ~29A at 1.2 A/mm²   (sub-distribution)
  20 × 3 mm   = 60 mm²  = ~72A                  (small panels)
  30 × 5 mm   = 150 mm² = ~180A                 (medium distribution)
  50 × 5 mm   = 250 mm² = ~300A                 (main distribution board)
  60 × 10 mm  = 600 mm² = ~720A                 (high-current MDB)

Protokół badania odbiorczego — wymagana zawartość

Panel identification:
  Serial number, customer order reference, delivery date

Visual inspection: PASS / FAIL
  Checklist completed, inspector signature

Dielectric voltage withstand test:
  Test voltage applied (V AC or V DC)
  Test duration (seconds)
  Leakage current (mA) or pass/fail instrument reading
  Result: PASS / FAIL

Temperature rise (if thermography performed):
  Maximum temperature rise recorded (K)
  Location of maximum (busbar/terminal reference)
  Ambient temperature at time of test (°C)
  Result: within limits PASS / FAIL

PSCC at incomer:
  Measured value (kA)
  SCPD type and breaking capacity
  Panel ISCC from nameplate
  Result: SCPD adequate PASS / FAIL

Verification engineer: name, signature, date
Panel manufacturer: name, address, authorised signatory

KNX i DALI — dodatkowa weryfikacja

KNX bus voltage verification:
  Measure at farthest device on each TP segment
  Pass criterion: ≥ 22V DC at farthest device
  Instrument: Voltcraft VC820 or KNX multimeter

KNX bus current:
  Measure total bus current from PS640 output
  Pass criterion: ≤ 640mA (PS640 rated maximum)
  If > 640mA: add second PS640 coupler or reduce line length

ETS6 bus scan:
  All programmed device individual addresses visible
  No devices showing communication error in ETS6
  Bus scan finds no unassigned/unknown addresses

DALI bus scan (if DALI present):
  All DALI devices found and addressed (0–63)
  DALI bus voltage: 16V DC nominal (Tridonic/Helvar spec)
  DALI bus current within gateway rating

KNX test results filed in:
  Panel commissioning dossier (alongside IEC 61439 cert)
  ETS6 project file (signed and dated)
  Provided to building owner for O&M manual