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Electronic Theatre Controls Inc

Sensor Rack Electrical Inspection and Testing (EU)

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This article refers to CE versions of products, with a focus on UK testing regulations

This article is intended as a guide for a suitably skilled electrician to perform regular electrical inspection and testing on portable ETC equipment.

Any advice and values given here should be confirmed with a suitably skilled, trained and experienced electrician.

Test Module

Any reference to the sensor test module, refers to: 
P/N TLC0106-MODU1 / TLC0233-MODU1

This safely exposes the incoming (via a dual pole/neutral disconnecting C15 MCB) and outgoing wiring for a slot.

TLC0106-MODU1a.jpg

TLC0106-MODU1b.jpg

 

Test Procedures

Continuity of protective conductors including main and supplementary equipotential bonding (BS7671 Reg 612.2.1)

  • Incoming wiring
    • The CPC is exposed as PE on the test module
    • The live connectors are exposed as Source L and Source N
  • Load wiring
    • The CPC is exposed as PE on the test module
    • The live connectors are exposed as Out(1/2) L and Out(1/2) N for each output on the test module

Insulation resistance (BS7671 Reg 612.3.2)

  • Incoming wiring
    • It is required that the CEM is removed during this test
    • It is required that this test be performed at 250v, unless the neon and line filter boards are isolated. Alternativly the test can be performed at 500v if all live connectors are commoned, and the test performed against these and the CPC.
  • Load wiring
    • It is recommended that the CEM is removed during this test
    • The CPC is exposed as PE on the test module
    • The live connectors are exposed as Out(1/2) L and Out(1/2) N for each output on the test module

Protection by SELV, PELV or electrical separation (BS7671 Reg 612.4)

  • ELV Rack wiring
    • All ELV wiring should be visualy inspected to ensure suitable insulation or separation from LV conductors.
  • CEM
    • All external ELV control control signals are isolated via opto or galvanic isolators rated to at least 1000Vrms
    • No user testing can be performed. If more than a visual inspection is required, this can be tested by ETC

Basic protection by a barrier or enclosure provided during erection (BS7671 Reg 612.4.5)

  • At any point the rack is energised, all slots must be filled with modules
  • Blank modules, called Air Flow Modules (AFM p/n: 7050A1014) are avaliable

Polarity (BS7671 Reg 612.6)

  • Incoming wiring
    • The CPC is exposed as PE on the test module
    • The live connectors are exposed as Source L and Source N
  • Load wiring
    • The CPC is exposed as PE on the test module
    • The live connectors are exposed as Out(1/2) L and Out(1/2) N for each output on the test module

Protection by automatic disconnection of the supply (BS7671 Reg 612.8)

  • MCB
    • The characteristics of the MCB (As per BS EN 60898) will be displayed on the front right of the module.
    • Appendix A (below) details the exact curve characteristics 
  • RCD/RCBO
    • The characteristics of the RCD/RCBO (As per BS EN 61009-1) will be displayed on the front left of the module. This will be labeled as I(delta)n
    • A Sensor dimmer module should be controlled at 100% to limit modification of the waveform
      • It is recommended to use the microswitch labeled test, located inside the CEM. This is used to force all levels to full and to also bypass any voltage regulation performed by the CEM

Earth fault loop impedance (BS7671 Reg 612.9)

  • Calculation of Zs
    • The CPC is exposed as PE on the test module
    • The line connector is Out(1/2) L for each output on the test module
    • A Sensor dimmer module can be considered to have an impedance of 0.2ohm
    • A Sensor relay module can be considered to have an impedance of 0.05ohm
  • Direct measurment of Zs (Not recommeded)
    • The use of an constant current (ECC) module with suitably matched/rated over current protection or the direct of connection from Source to Out(1/2) on the test module will be required

Additional protection (BS7671 Reg 612.10)

  • The characteristics of the RCD/RCBO (As per BS EN 61009-1) will be displayed on the front left of the module. This will be labeled as I(delta)n

Prospective fault current (BS7671 Reg 612.11)

  • A Sensor dimmer module contains a toroidal choke, this limits the PSC to be with the the rating of the MCB
  • A Sensor relay module contains a BS EN 60269-2 listed HBC fuse
  • The Icn value of the module is located on a the base

Check of phase sequence (BS7671 Reg 612.12)

  • It is recommeded this is tested at the supply distribution board and then confirmed by visual inspection of the wiring labeling/colouring and/or continuity testing

Functional testing (BS7671 Reg 612.13)

  • The characteristics of the RCD/RCBO (As per BS EN 61009-1) will be displayed on the front left of the module. This will be labeled as I(delta)n
  • A test switch for the RCD is located to the right of the RCD
  • A Sensor dimmer module should be controlled at 100% to limit modification of the waveform
    • It is recommended to use the microswitch labeled test, located inside the CEM. This is used to force all levels to full and to also bypass any voltage regulation performed by the CEM
Verification of voltage drop (BS7671 Reg 612.14)
  • If this is determined by calculation, note that a dimmer modules will have an internal voltage drop. For details please consolte the relevant modules datasheet.
  • If this is determed by live testing the voltage drop with a Sensor dimmer module the module should be controlled at 100% to limit modification of the waveform, and a sutiable load should be attached.
    • It is recommended to use the microswitch labeled test, located inside the CEM. This is used to force all levels to full and to also bypass any voltage regulation performed by the CEM

Appendix A - MCB curve characteristics

sensor_mcb_curve.PNG

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