The majority are grey but the town has a single black cabinet to blend in by a grade2 listed building, also the cabinets are internally insulated so I don’t think the colour is related, maybe grey is a neutral colour which has the least visual impact.
All of VM's new & replacement cabinets are light grey. The reason is very simple. Darker cabinets absorb heat which can cause equipment to overheat in hot sunny weather. The more the cabinet reflects this heat the less chance of services being disrupted.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile