Last week I was asked by an extremely good (but impulsive!) customer if I could give a hand today and tomorrow helping a sound engineer sort out the new led dmx lighting on the ex radio 1 roadshow trailer. I met with my customer yesterday who told me my brief was to make it ‘right’. I started this morning.
The trailer is basically a 40’ metal artic trailer. It is used for private hire and for new years eve on Bideford Quay (which is a massive and renowned event). Prior to starting I consulted 713? in the bgb (which I have unfortunately left on the trailer).
The power requirements are not great, a 16.5kW sound system drawing around 12-15A on start up plus a few amps for the lighting. They have an onboard commando socket which they plug into any available 32A supply or they will use a generator if no supply is available. They have been relying on the supply point earth or a rod with 6mm earthing conductor when generating. There is no rcd protection.
Whilst waiting for my customer to appear to advise that the supply and earthing arrangements needed addressing and that rcd protection was required (certainly for new), myself and the sound engineer busied ourselves. Late this afternoon we were told that my customer died this morning and could we just go ahead and do whatever is necessary. I feel a bit ‘on my own’ and would appreciate any pointers or advice on my following thoughts:-
Earthing has to be tt as not under supervision. I therefore disconnect earth on commando socket (1m away from cu) or after isolator (.5m away from cu). What labelling would be required on cu?
Bonding. Chassis bonded in 10mm. Two sets of removable metal steps require bonding back to met when in use, separate bonding conductor to each with a ring crimped on end and provide earth stud on each set of steps (steps stowed whilst not in use). Assume I cannot supply an earth stud on the chassis and earth the steps back to that.
RCBO’s throughout.
Lighting is controlled by a dmx controller, each light has it’s own mains feed but linked via dmx patch leads. Sound engineer would like the effects lights to be on two different circuits and the dmx controller on a third to minimise results of any tripping. Instinctively I think this is wrong but not sure why.
Anything else I need to be aware of?
I will do my best to respond to any points requiring clarification but may have to go out this eve
Many thanks
The trailer is basically a 40’ metal artic trailer. It is used for private hire and for new years eve on Bideford Quay (which is a massive and renowned event). Prior to starting I consulted 713? in the bgb (which I have unfortunately left on the trailer).
The power requirements are not great, a 16.5kW sound system drawing around 12-15A on start up plus a few amps for the lighting. They have an onboard commando socket which they plug into any available 32A supply or they will use a generator if no supply is available. They have been relying on the supply point earth or a rod with 6mm earthing conductor when generating. There is no rcd protection.
Whilst waiting for my customer to appear to advise that the supply and earthing arrangements needed addressing and that rcd protection was required (certainly for new), myself and the sound engineer busied ourselves. Late this afternoon we were told that my customer died this morning and could we just go ahead and do whatever is necessary. I feel a bit ‘on my own’ and would appreciate any pointers or advice on my following thoughts:-
Earthing has to be tt as not under supervision. I therefore disconnect earth on commando socket (1m away from cu) or after isolator (.5m away from cu). What labelling would be required on cu?
Bonding. Chassis bonded in 10mm. Two sets of removable metal steps require bonding back to met when in use, separate bonding conductor to each with a ring crimped on end and provide earth stud on each set of steps (steps stowed whilst not in use). Assume I cannot supply an earth stud on the chassis and earth the steps back to that.
RCBO’s throughout.
Lighting is controlled by a dmx controller, each light has it’s own mains feed but linked via dmx patch leads. Sound engineer would like the effects lights to be on two different circuits and the dmx controller on a third to minimise results of any tripping. Instinctively I think this is wrong but not sure why.
Anything else I need to be aware of?
I will do my best to respond to any points requiring clarification but may have to go out this eve
Many thanks
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