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Electronic Theatre Controls Inc

Matrix II Rack Electrical Inspection and Testing (EU)

EUCE.png

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 Procedures

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

  • Incoming wiring
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The live connectors are exposed on the backplane, labeled "Power" in Appexdix A
  • Load wiring
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The live connectors are exposed on the backplane, labeled "Mod. A" and/or "Mod. B" in Appexdix A

Insulation resistance (BS7671 Reg 612.3.2)

  • Incoming wiring
    • It is required that the processor and dimmer modules are removed during this test
    • It is required that the fan is disconnected during this test, unless all live connectors are connected together and the test performed against these and the CPC.
  • Load wiring
    • It is recommended that the processor is removed during this test
    • If it required that the dimmer modules are removed during this test
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The live connectors are exposed on the backplane, labeled "Mod. A" and/or "Mod. B" in Appexdix A

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.
  • Processor
    • 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 or blanking panels.
  • Blanking panels, called Matrix Filler Blank Airflow (p/n: 7542A3050) are avaliable

Polarity (BS7671 Reg 612.6)

  • Incoming wiring
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The live connectors are exposed on the backplane, labeled "Power" in Appexdix A
  • Load wiring
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The live connectors are exposed on the backplane, labeled "Mod. A" and/or "Mod. B" in Appexdix A

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

  • MCB
    • The characteristics of the MCB (As per EN60898) will be displayed on the front of the breaker. This will be labeled as In
  • RCD
    • The characteristics of the RCD (As per BS EN60898) will be displayed on the front of the breaker. This will be labeled as I?n
    • A Matrix dimmer module should be controlled at 100% to limit modification of the waveform
      • It is recommended to use built in channel test function of the processor. Details can be obtained from the user manual
    • Modules that only contain resetable ADS confirming to EN60898 have final circuit overcurrent protection by means of a HBC fuse (See Appendix B) internal to the module.
  • RCBO
    • The characteristics of the RCBO (As per BS BS EN61009-1) will be displayed on the front of the breaker. This will be labeled as In and I?n
    • A Matrix dimmer module should be controlled at 100% to limit modification of the waveform
      • It is recommended to use built in channel test function of the processor. Details can be obtained from the user manual

Earth fault loop impedance (BS7671 Reg 612.9)

  • Calculation of Zs
    • The CPC is exposed on the shell of the backplane connector (see Appendix A)
    • The line connectors are exposed on the backplane, labeled "Mod. A" and/or "Mod. B" in Appexdix A
    • A dimmer dimmer module can be considered to have an impedance of 0.2?
    • A relay module can be considered to have an impedance of 0.05?
  • Direct measurment of Zs (Not recommeded)
    • The use of an "constant current" module with suitably matched/rated over current protection will be required

Additional protection (BS7671 Reg 612.10)

  • The characteristics of the RCD/RCBO (As per BS EN61009-1) will be displayed on the front of the breaker. This will be labeled as I?n

Prospective fault current (BS7671 Reg 612.11)

  • A Matrix installtion rack employs the use of DO2 Gg HBC fuses to BS EN 60269 per module slot
    • These provide an Icn of 6kA

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 EN61009-1) will be displayed on the front of the breaker. This will be labeled as I?n
  • A test switch for the RCD is located on the breaker
    • A Matrix dimmer module should be controlled at 100% to limit modification of the waveform
      • It is recommended to use built in channel test function of the processor. Details can be obtained from the user manual
Verification of voltage drop (BS7671 Reg 612.14)
  • It is recommend that the verifaction of voltage drop is performed by calculation
    • This is due to the waveform modification effect that dimmers modules create
  • If testing the voltage drop with a Matrix dimmer module the module should be controlled at 100% to limit modification of the waveform
    • It is recommended to use built in channel test function of the processor. Details can be obtained from the user manual

Appendix A - Backplane Pinout

MK2_power_pinout.png

Appendix B - Dimmer module HBC fuse

A number of module only form of resetable ADS is via an RCD.

These modules have final circuit overcurrent protection by means of a HBC fuse internal to the dimmer block.

These HBC fuses (Manufactures P/N: 0314015.HXP) have a In = 15A, as these are not directly referenced in BS7671, the curve is replicated below:

MK2_hbc_curve.png

A sutiable Zs(max)  of can be obtained by the follow equation. When confirming the below to the installtion, the relevent equivalent internal impedence of the module should be considered.

In = 15A

Ia(0.4s) = 60A

Zs(max) x Ia(0.4s) = UX Cmin

(UX Cmin)/Ia = (230x0.95)/60 = 3.64Ohm

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