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Adding more power capacity to the Power Cab

What is the Power Cab's Maximum Current Rating? (Using a non NCE Power Supply) 

Power Input Requirements: 10-15V regulated DC, 3A maximum
Power Connector: 5.5mm x 2.5mm center positive

The replacement Power Supply for this kit is a P114 (5240221) or equivalent (13.8VDC 1.8A) Use of ANY other Power Supply is not recommended and will void your factory warranty.

What you need to know.
a) The NCE PowerCab does not regulate the track voltage. The power supply does. Hence the DCC track voltage is about the same as the Power Supply's DC output voltage rating. So get a power supply that is somewhere between 12VDC and 14VDC. 13.8VDC is a common voltage the emulates a car battery voltage.

b) The NCE PowerCab does not set the current limit. The power supply does. Hence the PowerCab current rating is the same as the power supply's current rating. However, if the current exceeds 3 Amps, the NCE PowerCab will shutdown to protect itself. So one must be very careful about the selection of the power supply used with the PowerCab.

OTHER CONSIDERATIONS:

A) You cannot run 3 Amps continuously for the PowerCab. It will overheat with the PowerCab shell deforming due to the high heat build up. It is strongly recommended you use multiple DCC circuit breaker with each set 2 amp trip current for the layout. The PowerCab feeds all of these circuit breaker which then feed the various parts of the layout. The DCC circuit breakers will isolate any short circuit and protect the PowerCab from over heating when there is a short circuit.

B) The PowerCab long flat cable will lose a lot of voltage and may get warm when running a lot of trains. The cable and associated telco RJ jacks and plugs are not really designed to support 3 Amp efficiently.

The preferred method for adding more capacity to the Powercab is with the SB5 Smartbooster

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