LET_03A

University of Derby School of Arts Design and TechnologyDivision of Electronics & Sound

1

BSc Sound Light and Live Event TechnologyStage Two

Live Event Techniques

Production Electrics – Part 2


2

The Lighting Plan

• Using the plan of the number 1 LX Bar:– Where will the bar hang?– How many of what type of instrument do you need?– How many dimmer channels will you require?– How many control channels are required?

• It is ten metres from the end of the bar to the dimmer outlets , and the dimmer outlets are on a fly-floor 10 metres above stage level. The bars are 12 metres long and units 1 and 20 at the ends of the bars

– How many and of what length multicores are required?– Is there a way of reducing the number of multicores used?– Will this require any other equipment?

• Are there any other requirements for this bar?


3

Information & Management

• Two ways of approaching a lighting rig• Throw it together and hop

– Hang luminaire– Run lots of multicore– Sort out patch on the dimmers– Make it all up!

• This will work on small rigs– If nothing goes wrong– Tracing faults– Replugging– Adding units

• All will be difficult without management– As will providing information to others– Hire companies, venues, crew…..


4

Information & Management

• Clearly much better to use proper system• Any number of programmes will help

– Excel, Access– WYSIWYG– Pen and paper!!!

• Useful free programme for up to 75 entries • Lightwright by John McKernon

– http://www.mckernon.com/demodowns.htm


5

Lists

• Whatever programme one used• List the equipment• Useful to work by position


6

Lists

• LW can produce a lot of information – more targeted than WYSIWYG• The above is probably the minimum


7

Adding Information

• Add the information we know – Channel numbers, Irises, Colour• Highly likely the LD will not care about dimmers, circuits….


8

Channels?

• How many channels do we need??• What amperage?


9

Channels & Circuits

• Need 15 control channels • What does that affect?


10

Channels & Circuits

• So we could cable this bar to 15 dimmers using two multis, three lengths of TRS and a number of grelcos

• However cumbersome system


11

Dimmers

• However, dimmer per instrument is much easier if one has the resources• LW will do all the numbering

– Edit/Renumber


12

Dimmers

• Dimmers allocated– LW will even indicate phases ,– Phase separation might be an issue


13

Cabling/Circuiting

• How can I cable/circuit this bar?• 20 Circuits• 2 x TRS and 3x 6-way multicores

– TRS marked X1 and X2


14

This week

• LW will auto-number circuits


15

This week

• Multis marked A/B/C – but could be something else– Clarity is of the essence

• Circuits to be flashed out before rig leaves working height!


16

However

• You have now created a whole paperwork system that can provide information to others

– Number of instruments– Cable requirements– Colour call– Multis can be premarked– Racks can be patched before leaving the hire company

• With all the patching done in the virtual world, WYSIWYG can be deployed to programme the console offline.


17

Patching the

Dimmers• Multis will patch to the

rack– What end of the mulicore

do we present to the dimmer rack?

• TRS will plug to separate spider.


18

The Dimmers

• What information do I need to produce?

• How can I manage it?

• How can I produce it?Dimmers

Multis


19

Multicore Cables

• First 12 pins alternate live /neutral• Next 6 - earth


20

The Lighting Plan

• What is a production electrician?• What are the responsibilities of the PLX• What tasks does the PLX need to perform ?


21

The Lighting Plan

• The key is clearly a vital piece of information

• The key/legend provides us with information about the types of instruments we need.

• Two other vital pieces of information in this key

– ??– ??


22

The Lighting Plan

• Using the plan of the number 1 LX Bar:– Where will the bar hang?– How many of what type of instrument do you need?– How many dimmer channels will you require?– How many control channels are required?

• It is ten metres from the end of the bar to the dimmer outlets , and the dimmer outlets are on a fly-floor 10 metres above stage level. The bars are 12 metres long and units 1 and 20 at the ends of the bars

– How many and of what length multicores are required?– Is there a way of reducing the number of multicores used?– Will this require any other equipment?

• Are there any other requirements for this bar?

LET_03A

Business

dimmers dimmers

dimmer channels

dimmers multis

information management

bar hang

channels circuits

number circuits

lx bar